Idaho, US

Planting calendar for Boise

Last frost around April 20, first frost around October 29: about 192 frost-free days.

Last frost: April 20
First frost: October 29
Frost-free days: 192

Sow now: November

See the whole year

Outdoors

Garlic
Raspberry
Rhubarb

Under cover

Fava bean

The year at a glance

When each crop can be sown in Boise. Tap a crop for exact dates and when it’s ready to harvest.

Sow outdoorsSow under cover (indoors, a greenhouse or a cold frame)

When to sow each crop in Boise, month by month. Each month says whether you can sow outdoors, under cover, or both.
Crop	JJan	FFeb	MMar	AApr	MMay	JJun	JJul	AAug	SSep	OOct	NNov	DDec
Fruiting
Tomato	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Chile pepper	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Bell pepper	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Eggplant	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Zucchini	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Cucumber	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Winter squash	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Sweet corn	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Roots
Carrot	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Beet	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Parsnip	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Radish	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Potato	January: Not this month	February: Plant under cover	March: Plant outdoors and under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant under cover	July: Plant under cover	August: Plant outdoors and under cover	September: Plant under cover	October: Not this month	November: Not this month	December: Not this month
Turnip	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Leaves
Lettuce	January: Not this month	February: Not this month	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Spinach	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Swiss chard	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Arugula	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Celery	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Beans and peas
Runner bean	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Green bean	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Fava bean	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Not this month	June: Not this month	July: Not this month	August: Not this month	September: Sow under cover	October: Sow outdoors and under cover	November: Sow under cover	December: Not this month
Pea	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Onion family
Onion	January: Not this month	February: Plant under cover	March: Plant outdoors and under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Not this month	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Garlic	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Not this month	June: Not this month	July: Not this month	August: Not this month	September: Plant under cover	October: Plant outdoors and under cover	November: Plant outdoors and under cover	December: Plant under cover
Leek	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Scallion	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Shallot	January: Not this month	February: Plant under cover	March: Plant outdoors and under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant under cover	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Brassicas
Cabbage	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Broccoli	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Cauliflower	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Brussels sprout	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Kale	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Bok choy	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Herbs
Basil	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Parsley	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Cilantro	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Chives	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Mint	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Fruit
Strawberry	January: Not this month	February: Plant under cover	March: Plant outdoors and under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant under cover	July: Plant under cover	August: Plant outdoors and under cover	September: Plant under cover	October: Not this month	November: Not this month	December: Not this month
Raspberry	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Not this month	June: Not this month	July: Not this month	August: Not this month	September: Not this month	October: Plant under cover	November: Plant outdoors and under cover	December: Plant under cover
Rhubarb	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Not this month	June: Not this month	July: Not this month	August: Not this month	September: Plant under cover	October: Plant outdoors and under cover	November: Plant outdoors and under cover	December: Plant under cover

Fruit rows show when to plant, not sow.

Crop by crop

Fruiting

TomatoOutdoors May 25 to Jun 19, and Aug 2 to Aug 13; Under cover Apr 27 to Jul 17, and Aug 2 to Aug 13, and Aug 30 to Sep 10

Sow outdoors: May 25 to Jun 19, and Aug 2 to Aug 13
Under cover: Apr 27 to Jul 17, and Aug 2 to Aug 13, and Aug 30 to Sep 10
First harvest: About 66 days after sowing. Sown on May 25, ready around July 30.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Tomato across the US, town by town

Chile pepperOutdoors May 24 to Jun 19, and Aug 2 to Aug 12; Under cover Apr 26 to Jul 17, and Aug 2 to Aug 12, and Aug 30 to Sep 9

Sow outdoors: May 24 to Jun 19, and Aug 2 to Aug 12
Under cover: Apr 26 to Jul 17, and Aug 2 to Aug 12, and Aug 30 to Sep 9
First harvest: About 84 days after sowing. Sown on May 24, ready around August 16.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Chile pepper across the US, town by town

Bell pepperOutdoors May 29 to Jun 24, and Aug 2 to Aug 13; Under cover May 1 to Jul 22, and Aug 2 to Aug 13, and Aug 30 to Sep 10

Sow outdoors: May 29 to Jun 24, and Aug 2 to Aug 13
Under cover: May 1 to Jul 22, and Aug 2 to Aug 13, and Aug 30 to Sep 10
First harvest: About 78 days after sowing. Sown on May 29, ready around August 15.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Bell pepper across the US, town by town

EggplantOutdoors May 29 to Jun 19, and Aug 2 to Aug 12; Under cover May 1 to Jul 17, and Aug 2 to Aug 12, and Aug 30 to Sep 9

Sow outdoors: May 29 to Jun 19, and Aug 2 to Aug 12
Under cover: May 1 to Jul 17, and Aug 2 to Aug 12, and Aug 30 to Sep 9
First harvest: About 90 days after sowing. Sown on May 29, ready around August 27.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Eggplant across the US, town by town

ZucchiniOutdoors May 24 to Jul 4, and Aug 2 to Aug 29; Under cover Apr 26 to Sep 26

Sow outdoors: May 24 to Jul 4, and Aug 2 to Aug 29
Under cover: Apr 26 to Sep 26
First harvest: About 36 days after sowing. Sown on May 24, ready around June 29.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Zucchini across the US, town by town

CucumberOutdoors May 24 to Jul 4, and Aug 2 to Aug 25; Under cover Apr 26 to Sep 22

Sow outdoors: May 24 to Jul 4, and Aug 2 to Aug 25
Under cover: Apr 26 to Sep 22
First harvest: About 42 days after sowing. Sown on May 24, ready around July 5.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Cucumber across the US, town by town

Winter squashOutdoors May 24 to Jun 24, and Aug 2 to Aug 14; Under cover Apr 26 to Jul 22, and Aug 2 to Aug 14, and Aug 30 to Sep 11

Sow outdoors: May 24 to Jun 24, and Aug 2 to Aug 14
Under cover: Apr 26 to Jul 22, and Aug 2 to Aug 14, and Aug 30 to Sep 11
First harvest: About 66 days after sowing. Sown on May 24, ready around July 29.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Winter squash across the US, town by town

Sweet cornOutdoors May 19 to Jun 24, and Aug 2 to Aug 15; Under cover Apr 21 to Jul 22, and Aug 2 to Aug 15, and Aug 30 to Sep 12

Sow outdoors: May 19 to Jun 24, and Aug 2 to Aug 15
Under cover: Apr 21 to Jul 22, and Aug 2 to Aug 15, and Aug 30 to Sep 12
First harvest: About 60 days after sowing. Sown on May 19, ready around July 18.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Sweet corn across the US, town by town

Roots

CarrotOutdoors Mar 30 to Jul 8, and Aug 2 to Aug 11; Under cover Mar 2 to Aug 11, and Aug 30 to Sep 8

Sow outdoors: Mar 30 to Jul 8, and Aug 2 to Aug 11
Under cover: Mar 2 to Aug 11, and Aug 30 to Sep 8
First harvest: About 78 days after sowing. Sown on March 30, ready around June 16.
Warmth: Hardy: grows once days average 45°F.

Carrot across the US, town by town

BeetOutdoors Mar 30 to Jul 13, and Aug 2 to Aug 24; Under cover Mar 2 to Sep 21

Sow outdoors: Mar 30 to Jul 13, and Aug 2 to Aug 24
Under cover: Mar 2 to Sep 21
First harvest: About 57 days after sowing. Sown on March 30, ready around May 26.
Warmth: Hardy: grows once days average 45°F.

Beet across the US, town by town

ParsnipOutdoors Mar 21 to Jun 6; Under cover Feb 21 to Jul 4

Sow outdoors: Mar 21 to Jun 6
Under cover: Feb 21 to Jul 4
First harvest: About 96 days after sowing. Sown on March 21, ready around June 25.
Warmth: Hardy: grows once days average 43°F.

Parsnip across the US, town by town

RadishOutdoors Mar 21 to May 24, and Aug 11 to Sep 27; Under cover Feb 21 to Jun 21, and Jul 14 to Oct 25

Sow outdoors: Mar 21 to May 24, and Aug 11 to Sep 27
Under cover: Feb 21 to Jun 21, and Jul 14 to Oct 25
First harvest: About 23 days after sowing. Sown on March 21, ready around April 13.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Radish across the US, town by town

PotatoOutdoors Mar 21 to May 16, and Aug 2 to Aug 12; Under cover Feb 21 to Jun 13, and Jul 5 to Jul 15, and Aug 2 to Aug 12, and Aug 30 to Sep 9

Plant outdoors: Mar 21 to May 16, and Aug 2 to Aug 12
Under cover: Feb 21 to Jun 13, and Jul 5 to Jul 15, and Aug 2 to Aug 12, and Aug 30 to Sep 9
First harvest: About 76 days after planting. Planted on March 21, ready around June 5.
Warmth: Hardy: grows once days average 43°F.

Potato across the US, town by town

TurnipOutdoors Mar 21 to May 31, and Aug 6 to Sep 3; Under cover Feb 21 to Jun 28, and Jul 9 to Oct 1

Sow outdoors: Mar 21 to May 31, and Aug 6 to Sep 3
Under cover: Feb 21 to Jun 28, and Jul 9 to Oct 1
First harvest: About 47 days after sowing. Sown on March 21, ready around May 7.
Warmth: Hardy: grows once days average 43°F.

Turnip across the US, town by town

Leaves

LettuceOutdoors Mar 24 to May 19, and Aug 16 to Aug 30; Under cover Feb 24 to Jun 16, and Jul 19 to Aug 2, and Aug 16 to Aug 30, and Sep 13 to Sep 27

Sow outdoors: Mar 24 to May 19, and Aug 16 to Aug 30
Under cover: Feb 24 to Jun 16, and Jul 19 to Aug 2, and Aug 16 to Aug 30, and Sep 13 to Sep 27
First harvest: About 55 days after sowing. Sown on March 24, ready around May 18.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Lettuce across the US, town by town

SpinachOutdoors Mar 21 to May 19, and Aug 16 to Sep 22; Under cover Feb 21 to Jun 16, and Jul 19 to Oct 20

Sow outdoors: Mar 21 to May 19, and Aug 16 to Sep 22
Under cover: Feb 21 to Jun 16, and Jul 19 to Oct 20
First harvest: About 35 days after sowing. Sown on March 21, ready around April 25.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Spinach across the US, town by town

Swiss chardOutdoors Mar 30 to Sep 3; Under cover Mar 2 to Oct 1

Sow outdoors: Mar 30 to Sep 3
Under cover: Mar 2 to Oct 1
First harvest: About 49 days after sowing. Sown on March 30, ready around May 18.
Warmth: Hardy: grows once days average 45°F.

Swiss chard across the US, town by town

ArugulaOutdoors Mar 21 to May 19, and Aug 16 to Sep 23; Under cover Feb 21 to Jun 16, and Jul 19 to Oct 21

Sow outdoors: Mar 21 to May 19, and Aug 16 to Sep 23
Under cover: Feb 21 to Jun 16, and Jul 19 to Oct 21
First harvest: About 32 days after sowing. Sown on March 21, ready around April 22.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Arugula across the US, town by town

CeleryOutdoors Mar 15 to May 14; Under cover Feb 15 to Jun 11

Sow outdoors: Mar 15 to May 14
Under cover: Feb 15 to Jun 11
First harvest: About 93 days after sowing. Sown on March 15, ready around June 16.
Warmth: Hardy: grows once days average 41°F.

Celery across the US, town by town

Beans and peas

Runner beanOutdoors May 19 to Jul 4, and Aug 2 to Aug 19; Under cover Apr 21 to Aug 19, and Aug 30 to Sep 16

Sow outdoors: May 19 to Jul 4, and Aug 2 to Aug 19
Under cover: Apr 21 to Aug 19, and Aug 30 to Sep 16
First harvest: About 54 days after sowing. Sown on May 19, ready around July 12.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Runner bean across the US, town by town

Green beanOutdoors May 19 to Aug 27; Under cover Apr 21 to Sep 24

Sow outdoors: May 19 to Aug 27
Under cover: Apr 21 to Sep 24
First harvest: About 43 days after sowing. Sown on May 19, ready around July 1.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Green bean across the US, town by town

Fava beanOutdoors Oct 16 to Nov 5; Under cover Sep 18 to Dec 3

Sow outdoors: Oct 16 to Nov 5
Under cover: Sep 18 to Dec 3
First harvest: About 220 days after sowing. Sown on October 16, ready around May 24.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Fava bean across the US, town by town

PeaOutdoors Mar 21 to May 24, and Aug 11 to Aug 17; Under cover Feb 21 to Jun 21, and Jul 14 to Jul 20, and Aug 11 to Aug 17, and Sep 8 to Sep 14

Sow outdoors: Mar 21 to May 24, and Aug 11 to Aug 17
Under cover: Feb 21 to Jun 21, and Jul 14 to Jul 20, and Aug 11 to Aug 17, and Sep 8 to Sep 14
First harvest: About 61 days after sowing. Sown on March 21, ready around May 21.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Pea across the US, town by town

Onion family

OnionOutdoors Mar 19 to May 9; Under cover Feb 19 to Jun 6

Plant outdoors: Mar 19 to May 9
Under cover: Feb 19 to Jun 6
First harvest: About 102 days after planting. Planted on March 19, ready around June 29.
Warmth: Hardy: grows once days average 43°F.

Onion across the US, town by town

GarlicOutdoors Oct 16 to Nov 9; Under cover Sep 18 to Dec 7

Plant outdoors: Oct 16 to Nov 9
Under cover: Sep 18 to Dec 7
First harvest: About 250 days after planting. Planted on October 16, ready around June 23.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Garlic across the US, town by town

LeekOutdoors Mar 21 to Jul 6; Under cover Feb 21 to Aug 3

Sow outdoors: Mar 21 to Jul 6
Under cover: Feb 21 to Aug 3
First harvest: About 109 days after sowing. Sown on March 21, ready around July 8.
Warmth: Hardy: grows once days average 43°F.

Leek across the US, town by town

ScallionOutdoors Mar 15 to Sep 11; Under cover Feb 15 to Oct 9

Sow outdoors: Mar 15 to Sep 11
Under cover: Feb 15 to Oct 9
First harvest: About 50 days after sowing. Sown on March 15, ready around May 4.
Warmth: Hardy: grows once days average 41°F.

Scallion across the US, town by town

ShallotOutdoors Mar 11 to May 24; Under cover Feb 11 to Jun 21

Plant outdoors: Mar 11 to May 24
Under cover: Feb 11 to Jun 21
First harvest: About 88 days after planting. Planted on March 11, ready around June 7.
Warmth: Hardy: grows once days average 41°F.

Shallot across the US, town by town

Brassicas

CabbageOutdoors Mar 21 to Jun 16, and Jul 21 to Aug 11; Under cover Feb 21 to Sep 8

Sow outdoors: Mar 21 to Jun 16, and Jul 21 to Aug 11
Under cover: Feb 21 to Sep 8
First harvest: About 83 days after sowing. Sown on March 21, ready around June 12.
Warmth: Hardy: grows once days average 43°F.

Cabbage across the US, town by town

BroccoliOutdoors Mar 30 to Jun 16, and Aug 2 to Aug 12; Under cover Mar 2 to Jul 15, and Aug 2 to Aug 12, and Aug 30 to Sep 9

Sow outdoors: Mar 30 to Jun 16, and Aug 2 to Aug 12
Under cover: Mar 2 to Jul 15, and Aug 2 to Aug 12, and Aug 30 to Sep 9
First harvest: About 71 days after sowing. Sown on March 30, ready around June 9.
Warmth: Hardy: grows once days average 45°F.

Broccoli across the US, town by town

CauliflowerOutdoors Mar 21 to May 24; Under cover Feb 21 to Jun 21

Sow outdoors: Mar 21 to May 24
Under cover: Feb 21 to Jun 21
First harvest: About 90 days after sowing. Sown on March 21, ready around June 19.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Cauliflower across the US, town by town

Brussels sproutOutdoors Mar 21 to May 21; Under cover Feb 21 to Jun 18

Sow outdoors: Mar 21 to May 21
Under cover: Feb 21 to Jun 18
First harvest: About 124 days after sowing. Sown on March 21, ready around July 23.
Warmth: Hardy: grows once days average 43°F.

Brussels sprout across the US, town by town

KaleOutdoors Mar 30 to Jul 13, and Aug 2 to Aug 19; Under cover Mar 2 to Aug 19, and Aug 30 to Sep 16

Sow outdoors: Mar 30 to Jul 13, and Aug 2 to Aug 19
Under cover: Mar 2 to Aug 19, and Aug 30 to Sep 16
First harvest: About 64 days after sowing. Sown on March 30, ready around June 2.
Warmth: Hardy: grows once days average 45°F.

Kale across the US, town by town

Bok choyOutdoors Apr 7 to May 19, and Aug 16 to Sep 14; Under cover Mar 10 to Jun 16, and Jul 19 to Oct 12

Sow outdoors: Apr 7 to May 19, and Aug 16 to Sep 14
Under cover: Mar 10 to Jun 16, and Jul 19 to Oct 12
First harvest: About 39 days after sowing. Sown on April 7, ready around May 16.
Warmth: Hardy: grows once days average 46°F; bolts in hot weather.

Bok choy across the US, town by town

Herbs

BasilOutdoors Apr 20 to Aug 30; Under cover Mar 23 to Sep 27

Sow outdoors: Apr 20 to Aug 30
Under cover: Mar 23 to Sep 27
First harvest: About 46 days after sowing. Sown on April 20, ready around June 5.
Warmth: Tender: needs days averaging 46°F or more, and no frost.

Basil across the US, town by town

ParsleyOutdoors Mar 21 to Sep 1; Under cover Feb 21 to Sep 29

Sow outdoors: Mar 21 to Sep 1
Under cover: Feb 21 to Sep 29
First harvest: About 58 days after sowing. Sown on March 21, ready around May 18.
Warmth: Hardy: grows once days average 43°F.

Parsley across the US, town by town

CilantroOutdoors Mar 30 to May 19, and Aug 16 to Sep 13; Under cover Mar 2 to Jun 16, and Jul 19 to Oct 11

Sow outdoors: Mar 30 to May 19, and Aug 16 to Sep 13
Under cover: Mar 2 to Jun 16, and Jul 19 to Oct 11
First harvest: About 41 days after sowing. Sown on March 30, ready around May 10.
Warmth: Hardy: grows once days average 45°F; bolts in hot weather.

Cilantro across the US, town by town

ChivesOutdoors Mar 21 to Jun 6, and Aug 2 to Aug 19; Under cover Feb 21 to Jul 22, and Aug 2 to Aug 19, and Aug 30 to Sep 16

Sow outdoors: Mar 21 to Jun 6, and Aug 2 to Aug 19
Under cover: Feb 21 to Jul 22, and Aug 2 to Aug 19, and Aug 30 to Sep 16
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 43°F.

Chives across the US, town by town

MintOutdoors Mar 30 to Sep 30; Under cover Mar 2 to Oct 28

Sow outdoors: Mar 30 to Sep 30
Under cover: Mar 2 to Oct 28
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 45°F.

Mint across the US, town by town

Fruit

StrawberryOutdoors Mar 21 to May 21, and Aug 2 to Aug 16; Under cover Feb 21 to Jun 18, and Jul 5 to Jul 19, and Aug 2 to Aug 16, and Aug 30 to Sep 13

Plant outdoors: Mar 21 to May 21, and Aug 2 to Aug 16
Under cover: Feb 21 to Jun 18, and Jul 5 to Jul 19, and Aug 2 to Aug 16, and Aug 30 to Sep 13
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 43°F.

Strawberry across the US, town by town

RaspberryOutdoors Oct 29 to Nov 16; Under cover Oct 1 to Oct 19, and Oct 29 to Nov 16, and Nov 26 to Dec 14

Plant outdoors: Oct 29 to Nov 16
Under cover: Oct 1 to Oct 19, and Oct 29 to Nov 16, and Nov 26 to Dec 14
First harvest: Crops every year once it’s established.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Raspberry across the US, town by town

RhubarbOutdoors Oct 22 to Nov 13; Under cover Sep 24 to Dec 11

Plant outdoors: Oct 22 to Nov 13
Under cover: Sep 24 to Dec 11
First harvest: Crops every year once it’s established.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Rhubarb across the US, town by town

Nearby

Questions about growing in Boise

When is the last frost in Boise?

On average around April 20, and the first autumn frost comes around October 29. In a cold spring a frost can come a week or two late, so tender plants are safest out a week after the date.

Can I grow tomatoes outdoors in Boise?

Yes. Plant them outdoors May 25 to Jun 19, and Aug 2 to Aug 13, or under cover Apr 27 to Jul 17, and Aug 2 to Aug 13, and Aug 30 to Sep 10.

What can I sow in Boise in November?

Outdoors: garlic, raspberry, rhubarb. Under cover: fava bean.

How accurate are these dates?

They’re worked out from 30 years of climate data for this spot, adjusted for its height, so they’re a good guide for a typical year. Check the forecast before planting out anything tender.

Get these dates as reminders

Bia turns this calendar into a nudge when it’s time to sow, plant out and harvest, for your backyard or community garden plot in Boise. Free for 2 months.

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How these dates are worked out: climate records for this spot (ERA5-Land, 1995 to 2024), the local frost dates and the height above sea level turn a seed-packet date into a local one. Contains modified Copernicus Climate Change Service information; towns from GeoNames (CC BY 4.0). How sowing dates work