When to plant collard greens in Colorado

Collard greens
Plant out in Denver
Apr 6–Apr 20

Across Colorado the window opens between March 17 and April 12. Find your city below; the dates follow each town's own average last frost.

Plant out, Denver
Apr 6–Apr 20
Fall planting, Denver
Jul 16–Jul 30
Last frost, Denver
May 4

Plant out 2–4 weeks before the last frost; sow again for fall 10–12 weeks before the first frost. Collards handle both heat and frost better than most greens.

Collard greens planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
DenverApr 6–Apr 20
Colorado SpringsApr 5–Apr 19
AuroraApr 9–Apr 23
Fort CollinsApr 4–Apr 18
LakewoodApr 5–Apr 19
ThorntonApr 4–Apr 18
ArvadaApr 7–Apr 21
WestminsterApr 4–Apr 18
GreeleyApr 4–Apr 18
PuebloApr 2–Apr 16
CentennialApr 7–Apr 21
BoulderApr 8–Apr 22
LongmontApr 9–Apr 23
LovelandApr 12–Apr 26
BroomfieldApr 4–Apr 18
Commerce CityApr 5–Apr 19
Grand JunctionMar 17–Mar 31
LittletonApr 4–Apr 18
BrightonApr 5–Apr 19
WindsorApr 5–Apr 19
ErieApr 9–Apr 23
NorthglennApr 4–Apr 18
Security-WidefieldApr 5–Apr 19
EnglewoodApr 4–Apr 18
Pueblo WestMar 29–Apr 12
Wheat RidgeApr 7–Apr 21
LafayetteApr 4–Apr 18
FountainApr 5–Apr 19
EvansApr 4–Apr 18
JohnstownApr 12–Apr 26
All 34 cities
CityPlant outFall plantingLast frost
DenverApr 6 to Apr 20Jul 16 to Jul 30May 4
Colorado SpringsApr 5 to Apr 19Jul 16 to Jul 30May 3
AuroraApr 9 to Apr 23Jul 16 to Jul 30May 7
Fort CollinsApr 4 to Apr 18Jul 15 to Jul 29May 2
LakewoodApr 5 to Apr 19Jul 15 to Jul 29May 3
ThorntonApr 4 to Apr 18Jul 19 to Aug 2May 2
ArvadaApr 7 to Apr 21Jul 13 to Jul 27May 5
WestminsterApr 4 to Apr 18Jul 19 to Aug 2May 2
GreeleyApr 4 to Apr 18Jul 16 to Jul 30May 2
PuebloApr 2 to Apr 16Jul 17 to Jul 31Apr 30
CentennialApr 7 to Apr 21Jul 16 to Jul 30May 5
BoulderApr 8 to Apr 22Jul 13 to Jul 27May 6
LongmontApr 9 to Apr 23Jul 13 to Jul 27May 7
LovelandApr 12 to Apr 26May 10
BroomfieldApr 4 to Apr 18Jul 19 to Aug 2May 2
Commerce CityApr 5 to Apr 19Jul 15 to Jul 29May 3
Grand JunctionMar 17 to Mar 31Jul 31 to Aug 14Apr 14
LittletonApr 4 to Apr 18Jul 19 to Aug 2May 2
BrightonApr 5 to Apr 19Jul 15 to Jul 29May 3
WindsorApr 5 to Apr 19Jul 14 to Jul 28May 3
ErieApr 9 to Apr 23Jul 13 to Jul 27May 7
NorthglennApr 4 to Apr 18Jul 19 to Aug 2May 2
Security-WidefieldApr 5 to Apr 19Jul 16 to Jul 30May 3
EnglewoodApr 4 to Apr 18Jul 19 to Aug 2May 2
Pueblo WestMar 29 to Apr 12Jul 21 to Aug 4Apr 26
Wheat RidgeApr 7 to Apr 21Jul 13 to Jul 27May 5
LafayetteApr 4 to Apr 18Jul 19 to Aug 2May 2
FountainApr 5 to Apr 19Jul 16 to Jul 30May 3
EvansApr 4 to Apr 18Jul 16 to Jul 30May 2
JohnstownApr 12 to Apr 26May 10
Four Square MileApr 9 to Apr 23Jul 16 to Jul 30May 7
MontroseMar 31 to Apr 14Jul 22 to Aug 5Apr 28
LouisvilleApr 8 to Apr 22Jul 13 to Jul 27May 6
FirestoneApr 9 to Apr 23Jul 13 to Jul 27May 7

Questions

When should I plant collard greens in Colorado?

In Denver, plant out from April 6 to April 20. Across Colorado the window opens between March 17 and April 12, depending on the local last frost.

How is this date worked out?

Plant out 2–4 weeks before the last frost; sow again for fall 10–12 weeks before the first frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Colorado

Collard greens in other states

Frost dates for every city in Colorado