When to plant spinach in Colorado

Spinach
Sow outdoors in Denver
Mar 23–Apr 13

Across Colorado the window opens between March 3 and March 29. Find your city below; the dates follow each town's own average last frost.

Sow outdoors, Denver
Mar 23–Apr 13
Fall planting, Denver
Aug 13–Aug 27
Last frost, Denver
May 4

Sow outdoors 3–6 weeks before the last frost; sow again for fall 6–8 weeks before the first frost. Spinach bolts as days lengthen. Early spring and fall are its seasons.

Spinach planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
DenverMar 23–Apr 13
Colorado SpringsMar 22–Apr 12
AuroraMar 26–Apr 16
Fort CollinsMar 21–Apr 11
LakewoodMar 22–Apr 12
ThorntonMar 21–Apr 11
ArvadaMar 24–Apr 14
WestminsterMar 21–Apr 11
GreeleyMar 21–Apr 11
PuebloMar 19–Apr 9
CentennialMar 24–Apr 14
BoulderMar 25–Apr 15
LongmontMar 26–Apr 16
LovelandMar 29–Apr 19
BroomfieldMar 21–Apr 11
Commerce CityMar 22–Apr 12
Grand JunctionMar 3–Mar 24
LittletonMar 21–Apr 11
BrightonMar 22–Apr 12
WindsorMar 22–Apr 12
ErieMar 26–Apr 16
NorthglennMar 21–Apr 11
Security-WidefieldMar 22–Apr 12
EnglewoodMar 21–Apr 11
Pueblo WestMar 15–Apr 5
Wheat RidgeMar 24–Apr 14
LafayetteMar 21–Apr 11
FountainMar 22–Apr 12
EvansMar 21–Apr 11
JohnstownMar 29–Apr 19
All 34 cities
CitySow outdoorsFall plantingLast frost
DenverMar 23 to Apr 13Aug 13 to Aug 27May 4
Colorado SpringsMar 22 to Apr 12Aug 13 to Aug 27May 3
AuroraMar 26 to Apr 16Aug 13 to Aug 27May 7
Fort CollinsMar 21 to Apr 11Aug 12 to Aug 26May 2
LakewoodMar 22 to Apr 12Aug 12 to Aug 26May 3
ThorntonMar 21 to Apr 11Aug 16 to Aug 30May 2
ArvadaMar 24 to Apr 14Aug 10 to Aug 24May 5
WestminsterMar 21 to Apr 11Aug 16 to Aug 30May 2
GreeleyMar 21 to Apr 11Aug 13 to Aug 27May 2
PuebloMar 19 to Apr 9Aug 14 to Aug 28Apr 30
CentennialMar 24 to Apr 14Aug 13 to Aug 27May 5
BoulderMar 25 to Apr 15Aug 10 to Aug 24May 6
LongmontMar 26 to Apr 16Aug 10 to Aug 24May 7
LovelandMar 29 to Apr 19May 10
BroomfieldMar 21 to Apr 11Aug 16 to Aug 30May 2
Commerce CityMar 22 to Apr 12Aug 12 to Aug 26May 3
Grand JunctionMar 3 to Mar 24Aug 28 to Sep 11Apr 14
LittletonMar 21 to Apr 11Aug 16 to Aug 30May 2
BrightonMar 22 to Apr 12Aug 12 to Aug 26May 3
WindsorMar 22 to Apr 12Aug 11 to Aug 25May 3
ErieMar 26 to Apr 16Aug 10 to Aug 24May 7
NorthglennMar 21 to Apr 11Aug 16 to Aug 30May 2
Security-WidefieldMar 22 to Apr 12Aug 13 to Aug 27May 3
EnglewoodMar 21 to Apr 11Aug 16 to Aug 30May 2
Pueblo WestMar 15 to Apr 5Aug 18 to Sep 1Apr 26
Wheat RidgeMar 24 to Apr 14Aug 10 to Aug 24May 5
LafayetteMar 21 to Apr 11Aug 16 to Aug 30May 2
FountainMar 22 to Apr 12Aug 13 to Aug 27May 3
EvansMar 21 to Apr 11Aug 13 to Aug 27May 2
JohnstownMar 29 to Apr 19May 10
Four Square MileMar 26 to Apr 16Aug 13 to Aug 27May 7
MontroseMar 17 to Apr 7Aug 19 to Sep 2Apr 28
LouisvilleMar 25 to Apr 15Aug 10 to Aug 24May 6
FirestoneMar 26 to Apr 16Aug 10 to Aug 24May 7

Questions

When should I plant spinach in Colorado?

In Denver, sow outdoors from March 23 to April 13. Across Colorado the window opens between March 3 and March 29, depending on the local last frost.

How is this date worked out?

Sow outdoors 3–6 weeks before the last frost; sow again for fall 6–8 weeks before the first frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Colorado

Spinach in other states

Frost dates for every city in Colorado