When to plant brussels sprouts in Colorado

Brussels sprouts
Plant out in Denver
Apr 20–May 4

Across Colorado the window opens between March 31 and April 26. Find your city below; the dates follow each town's own average last frost.

Start indoors, Denver
Mar 9–Mar 23
Plant out, Denver
Apr 20–May 4
Fall planting, Denver
Jun 18–Jul 2
Last frost, Denver
May 4

Start seeds indoors 6–8 weeks before the last frost; plant out up to 2 weeks before the last frost; sow again for fall 14–16 weeks before the first frost. Sprouts taste best after a few frosts. Plan the harvest for late fall.

Brussels sprouts planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
DenverApr 20–May 4
Colorado SpringsApr 19–May 3
AuroraApr 23–May 7
Fort CollinsApr 18–May 2
LakewoodApr 19–May 3
ThorntonApr 18–May 2
ArvadaApr 21–May 5
WestminsterApr 18–May 2
GreeleyApr 18–May 2
PuebloApr 16–Apr 30
CentennialApr 21–May 5
BoulderApr 22–May 6
LongmontApr 23–May 7
LovelandApr 26–May 10
BroomfieldApr 18–May 2
Commerce CityApr 19–May 3
Grand JunctionMar 31–Apr 14
LittletonApr 18–May 2
BrightonApr 19–May 3
WindsorApr 19–May 3
ErieApr 23–May 7
NorthglennApr 18–May 2
Security-WidefieldApr 19–May 3
EnglewoodApr 18–May 2
Pueblo WestApr 12–Apr 26
Wheat RidgeApr 21–May 5
LafayetteApr 18–May 2
FountainApr 19–May 3
EvansApr 18–May 2
JohnstownApr 26–May 10
All 34 cities
CityStart indoorsPlant outFall plantingLast frost
DenverMar 9 to Mar 23Apr 20 to May 4Jun 18 to Jul 2May 4
Colorado SpringsMar 8 to Mar 22Apr 19 to May 3Jun 18 to Jul 2May 3
AuroraMar 12 to Mar 26Apr 23 to May 7Jun 18 to Jul 2May 7
Fort CollinsMar 7 to Mar 21Apr 18 to May 2Jun 17 to Jul 1May 2
LakewoodMar 8 to Mar 22Apr 19 to May 3Jun 17 to Jul 1May 3
ThorntonMar 7 to Mar 21Apr 18 to May 2Jun 21 to Jul 5May 2
ArvadaMar 10 to Mar 24Apr 21 to May 5Jun 15 to Jun 29May 5
WestminsterMar 7 to Mar 21Apr 18 to May 2Jun 21 to Jul 5May 2
GreeleyMar 7 to Mar 21Apr 18 to May 2Jun 18 to Jul 2May 2
PuebloMar 5 to Mar 19Apr 16 to Apr 30Jun 19 to Jul 3Apr 30
CentennialMar 10 to Mar 24Apr 21 to May 5Jun 18 to Jul 2May 5
BoulderMar 11 to Mar 25Apr 22 to May 6Jun 15 to Jun 29May 6
LongmontMar 12 to Mar 26Apr 23 to May 7Jun 15 to Jun 29May 7
LovelandMar 15 to Mar 29Apr 26 to May 10May 10
BroomfieldMar 7 to Mar 21Apr 18 to May 2Jun 21 to Jul 5May 2
Commerce CityMar 8 to Mar 22Apr 19 to May 3Jun 17 to Jul 1May 3
Grand JunctionFeb 17 to Mar 3Mar 31 to Apr 14Jul 3 to Jul 17Apr 14
LittletonMar 7 to Mar 21Apr 18 to May 2Jun 21 to Jul 5May 2
BrightonMar 8 to Mar 22Apr 19 to May 3Jun 17 to Jul 1May 3
WindsorMar 8 to Mar 22Apr 19 to May 3Jun 16 to Jun 30May 3
ErieMar 12 to Mar 26Apr 23 to May 7Jun 15 to Jun 29May 7
NorthglennMar 7 to Mar 21Apr 18 to May 2Jun 21 to Jul 5May 2
Security-WidefieldMar 8 to Mar 22Apr 19 to May 3Jun 18 to Jul 2May 3
EnglewoodMar 7 to Mar 21Apr 18 to May 2Jun 21 to Jul 5May 2
Pueblo WestMar 1 to Mar 15Apr 12 to Apr 26Jun 23 to Jul 7Apr 26
Wheat RidgeMar 10 to Mar 24Apr 21 to May 5Jun 15 to Jun 29May 5
LafayetteMar 7 to Mar 21Apr 18 to May 2Jun 21 to Jul 5May 2
FountainMar 8 to Mar 22Apr 19 to May 3Jun 18 to Jul 2May 3
EvansMar 7 to Mar 21Apr 18 to May 2Jun 18 to Jul 2May 2
JohnstownMar 15 to Mar 29Apr 26 to May 10May 10
Four Square MileMar 12 to Mar 26Apr 23 to May 7Jun 18 to Jul 2May 7
MontroseMar 3 to Mar 17Apr 14 to Apr 28Jun 24 to Jul 8Apr 28
LouisvilleMar 11 to Mar 25Apr 22 to May 6Jun 15 to Jun 29May 6
FirestoneMar 12 to Mar 26Apr 23 to May 7Jun 15 to Jun 29May 7

Questions

When should I plant brussels sprouts in Colorado?

In Denver, plant out from April 20 to May 4. Across Colorado the window opens between March 31 and April 26, depending on the local last frost.

How is this date worked out?

Start seeds indoors 6–8 weeks before the last frost; plant out up to 2 weeks before the last frost; sow again for fall 14–16 weeks before the first frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Colorado

Brussels sprouts in other states

Frost dates for every city in Colorado