When to plant celery in Colorado

Celery
Plant out in Denver
May 11–May 18

Across Colorado the window opens between April 21 and May 17. Find your city below; the dates follow each town's own average last frost.

Start indoors, Denver
Feb 9–Feb 23
Plant out, Denver
May 11–May 18
Last frost, Denver
May 4

Start seeds indoors 10–12 weeks before the last frost; plant out 1–2 weeks after the last frost. Celery needs steady moisture all season.

Celery planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
DenverMay 11–May 18
Colorado SpringsMay 10–May 17
AuroraMay 14–May 21
Fort CollinsMay 9–May 16
LakewoodMay 10–May 17
ThorntonMay 9–May 16
ArvadaMay 12–May 19
WestminsterMay 9–May 16
GreeleyMay 9–May 16
PuebloMay 7–May 14
CentennialMay 12–May 19
BoulderMay 13–May 20
LongmontMay 14–May 21
LovelandMay 17–May 24
BroomfieldMay 9–May 16
Commerce CityMay 10–May 17
Grand JunctionApr 21–Apr 28
LittletonMay 9–May 16
BrightonMay 10–May 17
WindsorMay 10–May 17
ErieMay 14–May 21
NorthglennMay 9–May 16
Security-WidefieldMay 10–May 17
EnglewoodMay 9–May 16
Pueblo WestMay 3–May 10
Wheat RidgeMay 12–May 19
LafayetteMay 9–May 16
FountainMay 10–May 17
EvansMay 9–May 16
JohnstownMay 17–May 24
All 34 cities
CityStart indoorsPlant outLast frost
DenverFeb 9 to Feb 23May 11 to May 18May 4
Colorado SpringsFeb 8 to Feb 22May 10 to May 17May 3
AuroraFeb 12 to Feb 26May 14 to May 21May 7
Fort CollinsFeb 7 to Feb 21May 9 to May 16May 2
LakewoodFeb 8 to Feb 22May 10 to May 17May 3
ThorntonFeb 7 to Feb 21May 9 to May 16May 2
ArvadaFeb 10 to Feb 24May 12 to May 19May 5
WestminsterFeb 7 to Feb 21May 9 to May 16May 2
GreeleyFeb 7 to Feb 21May 9 to May 16May 2
PuebloFeb 5 to Feb 19May 7 to May 14Apr 30
CentennialFeb 10 to Feb 24May 12 to May 19May 5
BoulderFeb 11 to Feb 25May 13 to May 20May 6
LongmontFeb 12 to Feb 26May 14 to May 21May 7
LovelandFeb 15 to Mar 1May 17 to May 24May 10
BroomfieldFeb 7 to Feb 21May 9 to May 16May 2
Commerce CityFeb 8 to Feb 22May 10 to May 17May 3
Grand JunctionJan 20 to Feb 3Apr 21 to Apr 28Apr 14
LittletonFeb 7 to Feb 21May 9 to May 16May 2
BrightonFeb 8 to Feb 22May 10 to May 17May 3
WindsorFeb 8 to Feb 22May 10 to May 17May 3
ErieFeb 12 to Feb 26May 14 to May 21May 7
NorthglennFeb 7 to Feb 21May 9 to May 16May 2
Security-WidefieldFeb 8 to Feb 22May 10 to May 17May 3
EnglewoodFeb 7 to Feb 21May 9 to May 16May 2
Pueblo WestFeb 1 to Feb 15May 3 to May 10Apr 26
Wheat RidgeFeb 10 to Feb 24May 12 to May 19May 5
LafayetteFeb 7 to Feb 21May 9 to May 16May 2
FountainFeb 8 to Feb 22May 10 to May 17May 3
EvansFeb 7 to Feb 21May 9 to May 16May 2
JohnstownFeb 15 to Mar 1May 17 to May 24May 10
Four Square MileFeb 12 to Feb 26May 14 to May 21May 7
MontroseFeb 3 to Feb 17May 5 to May 12Apr 28
LouisvilleFeb 11 to Feb 25May 13 to May 20May 6
FirestoneFeb 12 to Feb 26May 14 to May 21May 7

Questions

When should I plant celery in Colorado?

In Denver, plant out from May 11 to May 18. Across Colorado the window opens between April 21 and May 17, depending on the local last frost.

How is this date worked out?

Start seeds indoors 10–12 weeks before the last frost; plant out 1–2 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Colorado

Celery in other states

Frost dates for every city in Colorado