FrostCal

When to Plant Cauliflower in Colorado

In a typical Colorado location, start seeds indoors Mar 15 – Mar 29, then transplant outdoors Apr 19 – Apr 26. Across the state, the outdoor planting window starts as early as Mar 31 in Grand Junction and as late as Jun 7 in Edwards. For a fall crop, plant around Jul 30 – Aug 6.

Method Start indoors, then transplant
Days to maturity 55–85 days

Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost.

Cauliflower Planting Dates by City

CityStart indoorsTransplantFall planting
DenverMar 12 – Mar 26Apr 16 – Apr 23Aug 3 – Aug 10
Colorado SpringsMar 15 – Mar 29Apr 19 – Apr 26Jul 30 – Aug 6
AuroraMar 16 – Mar 30Apr 20 – Apr 27Jul 30 – Aug 6
Fort CollinsMar 14 – Mar 28Apr 18 – Apr 25Jul 29 – Aug 5
LakewoodMar 15 – Mar 29Apr 19 – Apr 26Jul 29 – Aug 5
ThorntonMar 14 – Mar 28Apr 18 – Apr 25Aug 2 – Aug 9
WestminsterMar 14 – Mar 28Apr 18 – Apr 25Aug 2 – Aug 9
ArvadaMar 17 – Mar 31Apr 21 – Apr 28Jul 27 – Aug 3
CentennialMar 17 – Mar 31Apr 21 – Apr 28Jul 30 – Aug 6
PuebloMar 12 – Mar 26Apr 16 – Apr 23Jul 31 – Aug 7
GreeleyMar 14 – Mar 28Apr 18 – Apr 25Jul 30 – Aug 6
BoulderMar 18 – Apr 1Apr 22 – Apr 29Jul 27 – Aug 3
Highlands RanchMar 17 – Mar 31Apr 21 – Apr 28Jul 30 – Aug 6
LongmontMar 19 – Apr 2Apr 23 – Apr 30Jul 27 – Aug 3
LovelandMar 22 – Apr 5Apr 26 – May 3Jul 23 – Jul 30
BroomfieldMar 14 – Mar 28Apr 18 – Apr 25Aug 2 – Aug 9
Grand JunctionFeb 24 – Mar 10Mar 31 – Apr 7Aug 14 – Aug 21
Castle RockMar 21 – Apr 4Apr 25 – May 2Jul 24 – Jul 31
Commerce CityMar 16 – Mar 30Apr 20 – Apr 27Jul 30 – Aug 6
ParkerMar 21 – Apr 4Apr 25 – May 2Jul 25 – Aug 1
LittletonMar 14 – Mar 28Apr 18 – Apr 25Aug 2 – Aug 9
NorthglennMar 14 – Mar 28Apr 18 – Apr 25Aug 2 – Aug 9
BrightonMar 15 – Mar 29Apr 19 – Apr 26Jul 29 – Aug 5
Dakota RidgeMar 14 – Mar 28Apr 18 – Apr 25Aug 2 – Aug 9
EnglewoodMar 14 – Mar 28Apr 18 – Apr 25Aug 2 – Aug 9
Security-WidefieldMar 15 – Mar 29Apr 19 – Apr 26Jul 30 – Aug 6
WindsorMar 15 – Mar 29Apr 19 – Apr 26Jul 28 – Aug 4
Ken CarylMar 14 – Mar 28Apr 18 – Apr 25Aug 2 – Aug 9
Wheat RidgeMar 17 – Mar 31Apr 21 – Apr 28Jul 27 – Aug 3
Pueblo WestMar 8 – Mar 22Apr 12 – Apr 19Aug 4 – Aug 11

Showing the 30 most populous of 65 Colorado cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Colorado cities.

Frequently Asked Questions

When should I plant cauliflower in Colorado?

In a typical Colorado location, start seeds indoors Mar 15 – Mar 29, then transplant outdoors Apr 19 – Apr 26. Across the state, the outdoor planting window starts as early as Mar 31 in Grand Junction and as late as Jun 7 in Edwards. For a fall crop, plant around Jul 30 – Aug 6.

When is the last frost in Colorado?

The average last spring frost in Colorado ranges from April 14 in Grand Junction to June 21 in Edwards, based on NOAA 1991–2020 climate normals.

How long do cauliflower take to grow?

Cauliflower typically take 55–85 days from planting to harvest. Fussier than broccoli about temperature swings; start indoors 5-7 weeks before last frost, transplant 1-2 weeks before last frost.

Other Crops in Colorado

When to plant cauliflower in other states

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