FrostCal

When to Plant Brussels Sprouts in Colorado

In a typical Colorado location, start seeds indoors Mar 15 – Mar 29, then transplant outdoors Apr 12 – Apr 26. Across the state, the outdoor planting window starts as early as Mar 24 in Grand Junction and as late as May 31 in Edwards.

Method Start indoors, then transplant
Days to maturity 90–110 days

Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost.

Brussels Sprouts Planting Dates by City

CityStart indoorsTransplant
DenverMar 12 – Mar 26Apr 9 – Apr 23
Colorado SpringsMar 15 – Mar 29Apr 12 – Apr 26
AuroraMar 16 – Mar 30Apr 13 – Apr 27
Fort CollinsMar 14 – Mar 28Apr 11 – Apr 25
LakewoodMar 15 – Mar 29Apr 12 – Apr 26
ThorntonMar 14 – Mar 28Apr 11 – Apr 25
WestminsterMar 14 – Mar 28Apr 11 – Apr 25
ArvadaMar 17 – Mar 31Apr 14 – Apr 28
CentennialMar 17 – Mar 31Apr 14 – Apr 28
PuebloMar 12 – Mar 26Apr 9 – Apr 23
GreeleyMar 14 – Mar 28Apr 11 – Apr 25
BoulderMar 18 – Apr 1Apr 15 – Apr 29
Highlands RanchMar 17 – Mar 31Apr 14 – Apr 28
LongmontMar 19 – Apr 2Apr 16 – Apr 30
LovelandMar 22 – Apr 5Apr 19 – May 3
BroomfieldMar 14 – Mar 28Apr 11 – Apr 25
Grand JunctionFeb 24 – Mar 10Mar 24 – Apr 7
Castle RockMar 21 – Apr 4Apr 18 – May 2
Commerce CityMar 16 – Mar 30Apr 13 – Apr 27
ParkerMar 21 – Apr 4Apr 18 – May 2
LittletonMar 14 – Mar 28Apr 11 – Apr 25
NorthglennMar 14 – Mar 28Apr 11 – Apr 25
BrightonMar 15 – Mar 29Apr 12 – Apr 26
Dakota RidgeMar 14 – Mar 28Apr 11 – Apr 25
EnglewoodMar 14 – Mar 28Apr 11 – Apr 25
Security-WidefieldMar 15 – Mar 29Apr 12 – Apr 26
WindsorMar 15 – Mar 29Apr 12 – Apr 26
Ken CarylMar 14 – Mar 28Apr 11 – Apr 25
Wheat RidgeMar 17 – Mar 31Apr 14 – Apr 28
Pueblo WestMar 8 – Mar 22Apr 5 – Apr 19

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 Brussels sprouts in Colorado?

In a typical Colorado location, start seeds indoors Mar 15 – Mar 29, then transplant outdoors Apr 12 – Apr 26. Across the state, the outdoor planting window starts as early as Mar 24 in Grand Junction and as late as May 31 in Edwards.

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 Brussels sprouts take to grow?

Brussels Sprouts typically take 90–110 days from planting to harvest. Long-season crop best timed to mature after a light fall frost for sweetest flavor; start indoors 5-7 weeks before last frost.

Other Crops in Colorado

When to plant Brussels sprouts in other states

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