Colorado, US

Planting calendar for Fort Collins

Last frost around May 1, first frost around October 19: about 171 frost-free days.

Last frost: May 1
First frost: October 19
Frost-free days: 171

Sow now: November

See the whole year

Outdoors

Raspberry

Under cover

Fava bean
Garlic
Rhubarb

The year at a glance

When each crop can be sown in Fort Collins. 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 Fort Collins, 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 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 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 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 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
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 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
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 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
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: 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: 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: 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 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 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
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 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
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: Sow under cover	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: Not this month	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 outdoors and 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 5 to Jun 30; Under cover May 8 to Jul 28

Sow outdoors: Jun 5 to Jun 30
Under cover: May 8 to Jul 28
First harvest: About 66 days after sowing. Sown on June 5, ready around August 10.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Tomato across the US, town by town

Chile pepperOutdoors Jun 4 to Jun 30; Under cover May 7 to Jul 28

Sow outdoors: Jun 4 to Jun 30
Under cover: May 7 to Jul 28
First harvest: About 84 days after sowing. Sown on June 4, ready around August 27.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Chile pepper across the US, town by town

Bell pepperOutdoors Jun 9 to Jul 5; Under cover May 12 to Aug 2

Sow outdoors: Jun 9 to Jul 5
Under cover: May 12 to Aug 2
First harvest: About 78 days after sowing. Sown on June 9, ready around August 26.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Bell pepper across the US, town by town

EggplantOutdoors Jun 9 to Jun 30; Under cover May 12 to Jul 28

Sow outdoors: Jun 9 to Jun 30
Under cover: May 12 to Jul 28
First harvest: About 90 days after sowing. Sown on June 9, ready around September 7.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Eggplant across the US, town by town

ZucchiniOutdoors Jun 4 to Jul 15, and Jul 30 to Aug 15; Under cover May 7 to Aug 15, and Aug 27 to Sep 12

Sow outdoors: Jun 4 to Jul 15, and Jul 30 to Aug 15
Under cover: May 7 to Aug 15, and Aug 27 to Sep 12
First harvest: About 36 days after sowing. Sown on June 4, ready around July 10.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Zucchini across the US, town by town

CucumberOutdoors Jun 4 to Jul 15, and Jul 30 to Aug 10; Under cover May 7 to Aug 12, and Aug 27 to Sep 7

Sow outdoors: Jun 4 to Jul 15, and Jul 30 to Aug 10
Under cover: May 7 to Aug 12, and Aug 27 to Sep 7
First harvest: About 42 days after sowing. Sown on June 4, ready around July 16.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Cucumber across the US, town by town

Winter squashOutdoors Jun 4 to Jul 5; Under cover May 7 to Aug 2

Sow outdoors: Jun 4 to Jul 5
Under cover: May 7 to Aug 2
First harvest: About 66 days after sowing. Sown on June 4, ready around August 9.
Warmth: Tender: needs days averaging 54°F or more, and no frost.

Winter squash across the US, town by town

Sweet cornOutdoors May 30 to Jul 5; Under cover May 2 to Aug 2

Sow outdoors: May 30 to Jul 5
Under cover: May 2 to Aug 2
First harvest: About 60 days after sowing. Sown on May 30, ready around July 29.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Sweet corn across the US, town by town

Roots

CarrotOutdoors Apr 15 to Jul 24; Under cover Mar 18 to Aug 21

Sow outdoors: Apr 15 to Jul 24
Under cover: Mar 18 to Aug 21
First harvest: About 75 days after sowing. Sown on April 15, ready around June 29.
Warmth: Hardy: grows once days average 45°F.

Carrot across the US, town by town

BeetOutdoors Apr 15 to Aug 11; Under cover Mar 18 to Sep 8

Sow outdoors: Apr 15 to Aug 11
Under cover: Mar 18 to Sep 8
First harvest: About 54 days after sowing. Sown on April 15, ready around June 8.
Warmth: Hardy: grows once days average 45°F.

Beet across the US, town by town

ParsnipOutdoors Apr 8 to Jun 24; Under cover Mar 11 to Jul 22

Sow outdoors: Apr 8 to Jun 24
Under cover: Mar 11 to Jul 22
First harvest: About 91 days after sowing. Sown on April 8, ready around July 8.
Warmth: Hardy: grows once days average 43°F.

Parsnip across the US, town by town

RadishOutdoors Apr 8 to Jun 19, and Jul 13 to Sep 17; Under cover Mar 11 to Oct 15

Sow outdoors: Apr 8 to Jun 19, and Jul 13 to Sep 17
Under cover: Mar 11 to Oct 15
First harvest: About 20 days after sowing. Sown on April 8, ready around April 28.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Radish across the US, town by town

PotatoOutdoors Apr 8 to Jun 3; Under cover Mar 11 to Jul 1

Plant outdoors: Apr 8 to Jun 3
Under cover: Mar 11 to Jul 1
First harvest: About 70 days after planting. Planted on April 8, ready around June 17.
Warmth: Hardy: grows once days average 43°F.

Potato across the US, town by town

TurnipOutdoors Apr 8 to Aug 23; Under cover Mar 11 to Sep 20

Sow outdoors: Apr 8 to Aug 23
Under cover: Mar 11 to Sep 20
First harvest: About 42 days after sowing. Sown on April 8, ready around May 20.
Warmth: Hardy: grows once days average 43°F.

Turnip across the US, town by town

Leaves

LettuceOutdoors Apr 10 to Jun 6, and Jul 25 to Aug 18; Under cover Mar 13 to Sep 15

Sow outdoors: Apr 10 to Jun 6, and Jul 25 to Aug 18
Under cover: Mar 13 to Sep 15
First harvest: About 51 days after sowing. Sown on April 10, 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 8 to Jun 6, and Jul 25 to Sep 12; Under cover Mar 11 to Oct 10

Sow outdoors: Apr 8 to Jun 6, and Jul 25 to Sep 12
Under cover: Mar 11 to Oct 10
First harvest: About 32 days after sowing. Sown on April 8, ready around May 10.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Spinach across the US, town by town

Swiss chardOutdoors Apr 15 to Aug 23; Under cover Mar 18 to Sep 20

Sow outdoors: Apr 15 to Aug 23
Under cover: Mar 18 to Sep 20
First harvest: About 46 days after sowing. Sown on April 15, ready around May 31.
Warmth: Hardy: grows once days average 45°F.

Swiss chard across the US, town by town

ArugulaOutdoors Apr 8 to Jun 6, and Jul 25 to Sep 13; Under cover Mar 11 to Oct 11

Sow outdoors: Apr 8 to Jun 6, and Jul 25 to Sep 13
Under cover: Mar 11 to Oct 11
First harvest: About 29 days after sowing. Sown on April 8, 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 4 to Jun 3; Under cover Mar 7 to Jul 1

Sow outdoors: Apr 4 to Jun 3
Under cover: Mar 7 to Jul 1
First harvest: About 87 days after sowing. Sown on April 4, ready around June 30.
Warmth: Hardy: grows once days average 41°F.

Celery across the US, town by town

Beans and peas

Runner beanOutdoors May 30 to Jul 15; Under cover May 2 to Aug 12

Sow outdoors: May 30 to Jul 15
Under cover: May 2 to Aug 12
First harvest: About 54 days after sowing. Sown on May 30, ready around July 23.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Runner bean across the US, town by town

Green beanOutdoors May 30 to Aug 13; Under cover May 2 to Sep 10

Sow outdoors: May 30 to Aug 13
Under cover: May 2 to Sep 10
First harvest: About 45 days after sowing. Sown on May 30, ready around July 14.
Warmth: Tender: needs days averaging 52°F or more, and no frost.

Green bean across the US, town by town

Fava beanOutdoors Oct 7 to Oct 29; Under cover Sep 9 to Nov 26

Sow outdoors: Oct 7 to Oct 29
Under cover: Sep 9 to Nov 26
First harvest: About 220 days after sowing. Sown on October 7, ready around May 15.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Fava bean across the US, town by town

PeaOutdoors Apr 8 to Jun 19; Under cover Mar 11 to Jul 17

Sow outdoors: Apr 8 to Jun 19
Under cover: Mar 11 to Jul 17
First harvest: About 56 days after sowing. Sown on April 8, ready around June 3.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Pea across the US, town by town

Onion family

OnionOutdoors Apr 7 to May 28; Under cover Mar 10 to Jun 25

Plant outdoors: Apr 7 to May 28
Under cover: Mar 10 to Jun 25
First harvest: About 97 days after planting. Planted on April 7, ready around July 13.
Warmth: Hardy: grows once days average 43°F.

Onion across the US, town by town

GarlicOutdoors Oct 7 to Nov 1; Under cover Sep 9 to Nov 29

Plant outdoors: Oct 7 to Nov 1
Under cover: Sep 9 to Nov 29
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 8 to Jul 24; Under cover Mar 11 to Aug 21

Sow outdoors: Apr 8 to Jul 24
Under cover: Mar 11 to Aug 21
First harvest: About 105 days after sowing. Sown on April 8, ready around July 22.
Warmth: Hardy: grows once days average 43°F.

Leek across the US, town by town

ScallionOutdoors Apr 4 to Sep 1; Under cover Mar 7 to Sep 29

Sow outdoors: Apr 4 to Sep 1
Under cover: Mar 7 to Sep 29
First harvest: About 45 days after sowing. Sown on April 4, ready around May 19.
Warmth: Hardy: grows once days average 41°F.

Scallion across the US, town by town

ShallotOutdoors Mar 31 to Jun 13; Under cover Mar 3 to Jul 11

Plant outdoors: Mar 31 to Jun 13
Under cover: Mar 3 to Jul 11
First harvest: About 81 days after planting. Planted on March 31, ready around June 20.
Warmth: Hardy: grows once days average 41°F.

Shallot across the US, town by town

Brassicas

CabbageOutdoors Apr 8 to Aug 8; Under cover Mar 11 to Sep 5

Sow outdoors: Apr 8 to Aug 8
Under cover: Mar 11 to Sep 5
First harvest: About 78 days after sowing. Sown on April 8, ready around June 25.
Warmth: Hardy: grows once days average 43°F.

Cabbage across the US, town by town

BroccoliOutdoors Apr 15 to Jul 14; Under cover Mar 18 to Aug 11

Sow outdoors: Apr 15 to Jul 14
Under cover: Mar 18 to Aug 11
First harvest: About 68 days after sowing. Sown on April 15, ready around June 22.
Warmth: Hardy: grows once days average 45°F.

Broccoli across the US, town by town

CauliflowerOutdoors Apr 8 to Jun 19; Under cover Mar 11 to Jul 17

Sow outdoors: Apr 8 to Jun 19
Under cover: Mar 11 to Jul 17
First harvest: About 85 days after sowing. Sown on April 8, ready around July 2.
Warmth: Hardy: grows once days average 43°F; bolts in hot weather.

Cauliflower across the US, town by town

Brussels sproutOutdoors Apr 8 to Jun 8; Under cover Mar 11 to Jul 6

Sow outdoors: Apr 8 to Jun 8
Under cover: Mar 11 to Jul 6
First harvest: About 123 days after sowing. Sown on April 8, ready around August 9.
Warmth: Hardy: grows once days average 43°F.

Brussels sprout across the US, town by town

KaleOutdoors Apr 15 to Aug 6; Under cover Mar 18 to Sep 3

Sow outdoors: Apr 15 to Aug 6
Under cover: Mar 18 to Sep 3
First harvest: About 61 days after sowing. Sown on April 15, ready around June 15.
Warmth: Hardy: grows once days average 45°F.

Kale across the US, town by town

Bok choyOutdoors Apr 22 to Jun 6, and Jul 25 to Sep 4; Under cover Mar 25 to Oct 2

Sow outdoors: Apr 22 to Jun 6, and Jul 25 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 1 to Aug 16; Under cover Apr 3 to Sep 13

Sow outdoors: May 1 to Aug 16
Under cover: Apr 3 to Sep 13
First harvest: About 44 days after sowing. Sown on May 1, ready around June 14.
Warmth: Tender: needs days averaging 46°F or more, and no frost.

Basil across the US, town by town

ParsleyOutdoors Apr 8 to Aug 21; Under cover Mar 11 to Sep 18

Sow outdoors: Apr 8 to Aug 21
Under cover: Mar 11 to Sep 18
First harvest: About 53 days after sowing. Sown on April 8, ready around May 31.
Warmth: Hardy: grows once days average 43°F.

Parsley across the US, town by town

CilantroOutdoors Apr 15 to Jun 6, and Jul 25 to Sep 3; Under cover Mar 18 to Oct 1

Sow outdoors: Apr 15 to Jun 6, and Jul 25 to Sep 3
Under cover: Mar 18 to Oct 1
First harvest: About 39 days after sowing. Sown on April 15, ready around May 24.
Warmth: Hardy: grows once days average 45°F; bolts in hot weather.

Cilantro across the US, town by town

ChivesOutdoors Apr 8 to Jun 24, and Jul 30 to Aug 5; Under cover Mar 11 to Aug 5, and Aug 27 to Sep 2

Sow outdoors: Apr 8 to Jun 24, and Jul 30 to Aug 5
Under cover: Mar 11 to Aug 5, and Aug 27 to Sep 2
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 15 to Sep 21; Under cover Mar 18 to Oct 19

Sow outdoors: Apr 15 to Sep 21
Under cover: Mar 18 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 8 to Jun 8; Under cover Mar 11 to Jul 6

Plant outdoors: Apr 8 to Jun 8
Under cover: Mar 11 to Jul 6
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 8; Under cover Sep 23 to Oct 11, and Oct 21 to Nov 8, and Nov 18 to Dec 6

Plant outdoors: Oct 21 to Nov 8
Under cover: Sep 23 to Oct 11, and Oct 21 to Nov 8, and Nov 18 to Dec 6
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 5; Under cover Sep 15 to Dec 3

Plant outdoors: Oct 13 to Nov 5
Under cover: Sep 15 to Dec 3
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 Fort Collins

When is the last frost in Fort Collins?

On average around May 1, and the first autumn frost comes around October 19. 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 Fort Collins?

Yes. Plant them outdoors Jun 5 to Jun 30, or under cover May 8 to Jul 28.

What can I sow in Fort Collins in November?

Outdoors: raspberry. Under cover: fava bean, garlic, 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 Fort Collins. 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