Colorado, US

Planting calendar for Denver

Last frost around May 5, first frost around October 14: about 162 frost-free days.

Last frost: May 5
First frost: October 14
Frost-free days: 162

Sow now: November

See the whole year

Outdoors

Nothing this month.

Under cover

Garlic
Raspberry
Rhubarb

The year at a glance

When each crop can be sown in Denver. 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 Denver, 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 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
Chile 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: Not this month	September: Not this month	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 outdoors and under cover	August: Not this month	September: Not this month	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: Not this month	September: Not this month	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 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
Cucumber	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 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
Winter squash	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 outdoors and under cover	August: Not this month	September: Not this month	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: Not this month	May: Sow under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Not this month	September: Not this month	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 under cover	September: Not this month	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: 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: 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: 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
Potato	January: Not this month	February: Not this month	March: Plant 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
Turnip	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
Leaves
Lettuce	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
Spinach	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 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: 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 outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Celery	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: 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: Not this month	May: Sow under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow under cover	September: Not this month	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: Not this month	May: Sow 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: Sow under cover	April: Sow outdoors and under cover	May: Sow 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
Pea	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: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Onion family
Onion	January: Not this month	February: Not this month	March: Plant 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
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 under cover	December: Not this month
Leek	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 under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Scallion	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
Shallot	January: Not this month	February: Not this month	March: Plant under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant outdoors and under cover	July: Plant under cover	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: 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: Not this month	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 outdoors and under cover	August: Sow under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Cauliflower	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: 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: 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: 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 under cover	September: Not this month	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 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
Herbs
Basil	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
Parsley	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
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 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
Chives	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: Not this month	September: Not this month	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: Not this month	March: Plant under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant outdoors and under cover	July: Plant under cover	August: Not this month	September: Not this month	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: Plant under cover	October: Plant outdoors and under cover	November: Plant under cover	December: Not this month
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 under cover	December: Not this month

Fruit rows show when to plant, not sow.

Crop by crop

Fruiting

TomatoOutdoors Jun 9 to Jul 4; Under cover May 12 to Aug 1

Sow outdoors: Jun 9 to Jul 4
Under cover: May 12 to Aug 1
First harvest: About 66 days after sowing. Sown on June 9, ready around August 14.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Tomato across the US, town by town

Chile pepperOutdoors Jun 8 to Jul 4; Under cover May 11 to Aug 1

Sow outdoors: Jun 8 to Jul 4
Under cover: May 11 to Aug 1
First harvest: About 84 days after sowing. Sown on June 8, ready around August 31.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Chile pepper across the US, town by town

Bell pepperOutdoors Jun 13 to Jul 9; Under cover May 16 to Aug 6

Sow outdoors: Jun 13 to Jul 9
Under cover: May 16 to Aug 6
First harvest: About 78 days after sowing. Sown on June 13, ready around August 30.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Bell pepper across the US, town by town

EggplantOutdoors Jun 13 to Jul 4; Under cover May 16 to Aug 1

Sow outdoors: Jun 13 to Jul 4
Under cover: May 16 to Aug 1
First harvest: About 90 days after sowing. Sown on June 13, ready around September 11.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Eggplant across the US, town by town

ZucchiniOutdoors Jun 8 to Aug 15; Under cover May 11 to Sep 12

Sow outdoors: Jun 8 to Aug 15
Under cover: May 11 to Sep 12
First harvest: About 36 days after sowing. Sown on June 8, ready around July 14.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Zucchini across the US, town by town

CucumberOutdoors Jun 8 to Aug 11; Under cover May 11 to Sep 8

Sow outdoors: Jun 8 to Aug 11
Under cover: May 11 to Sep 8
First harvest: About 42 days after sowing. Sown on June 8, ready around July 20.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Cucumber across the US, town by town

Winter squashOutdoors Jun 8 to Jul 9; Under cover May 11 to Aug 6

Sow outdoors: Jun 8 to Jul 9
Under cover: May 11 to Aug 6
First harvest: About 66 days after sowing. Sown on June 8, ready around August 13.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Winter squash across the US, town by town

Sweet cornOutdoors Jun 3 to Jul 9; Under cover May 6 to Aug 6

Sow outdoors: Jun 3 to Jul 9
Under cover: May 6 to Aug 6
First harvest: About 60 days after sowing. Sown on June 3, ready around August 2.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Sweet corn across the US, town by town

Roots

CarrotOutdoors Apr 16 to Jul 25; Under cover Mar 19 to Aug 22

Sow outdoors: Apr 16 to Jul 25
Under cover: Mar 19 to Aug 22
First harvest: About 75 days after sowing. Sown on April 16, ready around June 30.
Warmth: Hardy: grows once days average 45°F.

Carrot across the US, town by town

BeetOutdoors Apr 16 to Aug 11; Under cover Mar 19 to Sep 8

Sow outdoors: Apr 16 to Aug 11
Under cover: Mar 19 to Sep 8
First harvest: About 54 days after sowing. Sown on April 16, ready around June 9.
Warmth: Hardy: grows once days average 45°F.

Beet across the US, town by town

ParsnipOutdoors Apr 9 to Jun 25; Under cover Mar 12 to Jul 23

Sow outdoors: Apr 9 to Jun 25
Under cover: Mar 12 to Jul 23
First harvest: About 91 days after sowing. Sown on April 9, ready around July 9.
Warmth: Hardy: grows once days average 43°F.

Parsnip across the US, town by town

RadishOutdoors Apr 9 to Jun 20, and Jul 13 to Sep 17; Under cover Mar 12 to Oct 15

Sow outdoors: Apr 9 to Jun 20, and Jul 13 to Sep 17
Under cover: Mar 12 to Oct 15
First harvest: About 20 days after sowing. Sown on April 9, ready around April 29.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Radish across the US, town by town

PotatoOutdoors Apr 9 to Jun 4; Under cover Mar 12 to Jul 2

Plant outdoors: Apr 9 to Jun 4
Under cover: Mar 12 to Jul 2
First harvest: About 70 days after planting. Planted on April 9, ready around June 18.
Warmth: Hardy: grows once days average 43°F.

Potato across the US, town by town

TurnipOutdoors Apr 9 to Aug 22; Under cover Mar 12 to Sep 19

Sow outdoors: Apr 9 to Aug 22
Under cover: Mar 12 to Sep 19
First harvest: About 42 days after sowing. Sown on April 9, ready around May 21.
Warmth: Hardy: grows once days average 43°F.

Turnip across the US, town by town

Leaves

LettuceOutdoors Apr 11 to Jun 7, and Jul 26 to Aug 18; Under cover Mar 14 to Sep 15

Sow outdoors: Apr 11 to Jun 7, and Jul 26 to Aug 18
Under cover: Mar 14 to Sep 15
First harvest: About 50 days after sowing. Sown on April 11, ready around May 31.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Lettuce across the US, town by town

SpinachOutdoors Apr 9 to Jun 7, and Jul 26 to Sep 12; Under cover Mar 12 to Oct 10

Sow outdoors: Apr 9 to Jun 7, and Jul 26 to Sep 12
Under cover: Mar 12 to Oct 10
First harvest: About 32 days after sowing. Sown on April 9, ready around May 11.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Spinach across the US, town by town

Swiss chardOutdoors Apr 16 to Aug 22; Under cover Mar 19 to Sep 19

Sow outdoors: Apr 16 to Aug 22
Under cover: Mar 19 to Sep 19
First harvest: About 46 days after sowing. Sown on April 16, ready around June 1.
Warmth: Hardy: grows once days average 45°F.

Swiss chard across the US, town by town

ArugulaOutdoors Apr 9 to Jun 7, and Jul 26 to Sep 13; Under cover Mar 12 to Oct 11

Sow outdoors: Apr 9 to Jun 7, and Jul 26 to Sep 13
Under cover: Mar 12 to Oct 11
First harvest: About 28 days after sowing. Sown on April 9, ready around May 7.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Arugula across the US, town by town

CeleryOutdoors Apr 5 to Jun 4; Under cover Mar 8 to Jul 2

Sow outdoors: Apr 5 to Jun 4
Under cover: Mar 8 to Jul 2
First harvest: About 87 days after sowing. Sown on April 5, ready around July 1.
Warmth: Hardy: grows once days average 41°F.

Celery across the US, town by town

Beans and peas

Runner beanOutdoors Jun 3 to Aug 4; Under cover May 6 to Sep 1

Sow outdoors: Jun 3 to Aug 4
Under cover: May 6 to Sep 1
First harvest: About 54 days after sowing. Sown on June 3, ready around July 27.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Runner bean across the US, town by town

Green beanOutdoors Jun 3 to Aug 13; Under cover May 6 to Sep 10

Sow outdoors: Jun 3 to Aug 13
Under cover: May 6 to Sep 10
First harvest: About 42 days after sowing. Sown on June 3, ready around July 15.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Green bean across the US, town by town

Fava beanOutdoors Apr 2 to Apr 21; Under cover Mar 5 to Mar 24, and Apr 2 to Apr 21, and Apr 30 to May 19

Sow outdoors: Apr 2 to Apr 21
Under cover: Mar 5 to Mar 24, and Apr 2 to Apr 21, and Apr 30 to May 19
First harvest: About 220 days after sowing. Sown on April 2, ready around November 8.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Fava bean across the US, town by town

PeaOutdoors Apr 9 to Jun 20; Under cover Mar 12 to Jul 18

Sow outdoors: Apr 9 to Jun 20
Under cover: Mar 12 to Jul 18
First harvest: About 56 days after sowing. Sown on April 9, ready around June 4.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Pea across the US, town by town

Onion family

OnionOutdoors Apr 8 to May 29; Under cover Mar 11 to Jun 26

Plant outdoors: Apr 8 to May 29
Under cover: Mar 11 to Jun 26
First harvest: About 97 days after planting. Planted on April 8, ready around July 14.
Warmth: Hardy: grows once days average 43°F.

Onion across the US, town by town

GarlicOutdoors Oct 7 to Oct 31; Under cover Sep 9 to Nov 28

Plant outdoors: Oct 7 to Oct 31
Under cover: Sep 9 to Nov 28
First harvest: About 250 days after planting. Planted on October 7, ready around June 14.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Garlic across the US, town by town

LeekOutdoors Apr 9 to Jul 25; Under cover Mar 12 to Aug 22

Sow outdoors: Apr 9 to Jul 25
Under cover: Mar 12 to Aug 22
First harvest: About 105 days after sowing. Sown on April 9, ready around July 23.
Warmth: Hardy: grows once days average 43°F.

Leek across the US, town by town

ScallionOutdoors Apr 5 to Aug 31; Under cover Mar 8 to Sep 28

Sow outdoors: Apr 5 to Aug 31
Under cover: Mar 8 to Sep 28
First harvest: About 45 days after sowing. Sown on April 5, ready around May 20.
Warmth: Hardy: grows once days average 41°F.

Scallion across the US, town by town

ShallotOutdoors Apr 2 to Jun 15; Under cover Mar 5 to Jul 13

Plant outdoors: Apr 2 to Jun 15
Under cover: Mar 5 to Jul 13
First harvest: About 81 days after planting. Planted on April 2, ready around June 22.
Warmth: Hardy: grows once days average 41°F.

Shallot across the US, town by town

Brassicas

CabbageOutdoors Apr 9 to Aug 9; Under cover Mar 12 to Sep 6

Sow outdoors: Apr 9 to Aug 9
Under cover: Mar 12 to Sep 6
First harvest: About 78 days after sowing. Sown on April 9, ready around June 26.
Warmth: Hardy: grows once days average 43°F.

Cabbage across the US, town by town

BroccoliOutdoors Apr 16 to Jul 15; Under cover Mar 19 to Aug 12

Sow outdoors: Apr 16 to Jul 15
Under cover: Mar 19 to Aug 12
First harvest: About 68 days after sowing. Sown on April 16, ready around June 23.
Warmth: Hardy: grows once days average 45°F.

Broccoli across the US, town by town

CauliflowerOutdoors Apr 9 to Jun 20; Under cover Mar 12 to Jul 18

Sow outdoors: Apr 9 to Jun 20
Under cover: Mar 12 to Jul 18
First harvest: About 85 days after sowing. Sown on April 9, ready around July 3.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Cauliflower across the US, town by town

Brussels sproutOutdoors Apr 9 to Jun 9; Under cover Mar 12 to Jul 7

Sow outdoors: Apr 9 to Jun 9
Under cover: Mar 12 to Jul 7
First harvest: About 123 days after sowing. Sown on April 9, ready around August 10.
Warmth: Hardy: grows once days average 43°F.

Brussels sprout across the US, town by town

KaleOutdoors Apr 16 to Aug 6; Under cover Mar 19 to Sep 3

Sow outdoors: Apr 16 to Aug 6
Under cover: Mar 19 to Sep 3
First harvest: About 61 days after sowing. Sown on April 16, ready around June 16.
Warmth: Hardy: grows once days average 45°F.

Kale across the US, town by town

Bok choyOutdoors Apr 22 to Jun 7, and Jul 26 to Sep 4; Under cover Mar 25 to Oct 2

Sow outdoors: Apr 22 to Jun 7, and Jul 26 to Sep 4
Under cover: Mar 25 to Oct 2
First harvest: About 37 days after sowing. Sown on April 22, ready around May 29.
Warmth: Hardy: grows once days average 46°F; bolts in hot weather.

Bok choy across the US, town by town

Herbs

BasilOutdoors May 5 to Aug 17; Under cover Apr 7 to Sep 14

Sow outdoors: May 5 to Aug 17
Under cover: Apr 7 to Sep 14
First harvest: About 45 days after sowing. Sown on May 5, ready around June 19.
Warmth: Tender: needs days averaging 46°F or more, and no frost.

Basil across the US, town by town

ParsleyOutdoors Apr 9 to Aug 21; Under cover Mar 12 to Sep 18

Sow outdoors: Apr 9 to Aug 21
Under cover: Mar 12 to Sep 18
First harvest: About 53 days after sowing. Sown on April 9, ready around June 1.
Warmth: Hardy: grows once days average 43°F.

Parsley across the US, town by town

CilantroOutdoors Apr 16 to Jun 7, and Jul 26 to Sep 2; Under cover Mar 19 to Sep 30

Sow outdoors: Apr 16 to Jun 7, and Jul 26 to Sep 2
Under cover: Mar 19 to Sep 30
First harvest: About 39 days after sowing. Sown on April 16, ready around May 25.
Warmth: Hardy: grows once days average 45°F; bolts in hot weather.

Cilantro across the US, town by town

ChivesOutdoors Apr 9 to Jun 25; Under cover Mar 12 to Jul 23

Sow outdoors: Apr 9 to Jun 25
Under cover: Mar 12 to Jul 23
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 Apr 16 to Sep 21; Under cover Mar 19 to Oct 19

Sow outdoors: Apr 16 to Sep 21
Under cover: Mar 19 to Oct 19
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 Apr 9 to Jun 9; Under cover Mar 12 to Jul 7

Plant outdoors: Apr 9 to Jun 9
Under cover: Mar 12 to Jul 7
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 21 to Nov 6; Under cover Sep 23 to Oct 9, and Oct 21 to Nov 6, and Nov 18 to Dec 4

Plant outdoors: Oct 21 to Nov 6
Under cover: Sep 23 to Oct 9, and Oct 21 to Nov 6, and Nov 18 to Dec 4
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 13 to Nov 4; Under cover Sep 15 to Dec 2

Plant outdoors: Oct 13 to Nov 4
Under cover: Sep 15 to Dec 2
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 Denver

When is the last frost in Denver?

On average around May 5, and the first autumn frost comes around October 14. 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 Denver?

Yes. Plant them outdoors Jun 9 to Jul 4, or under cover May 12 to Aug 1.

What can I sow in Denver in November?

Nothing outdoors this month. Under cover: garlic, raspberry, rhubarb.

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 Denver. 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