FrostCal

When to Plant Spinach in Colorado

In a typical Colorado location, sow outdoors Mar 22 – Apr 5. Across the state, the outdoor planting window starts as early as Mar 3 in Grand Junction and as late as May 10 in Edwards. For a fall crop, plant around Aug 13 – Aug 27.

Method Direct sow
Days to maturity 40–50 days

Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked.

Spinach Planting Dates by City

CityDirect sowFall planting
DenverMar 19 – Apr 2Aug 17 – Aug 31
Colorado SpringsMar 22 – Apr 5Aug 13 – Aug 27
AuroraMar 23 – Apr 6Aug 13 – Aug 27
Fort CollinsMar 21 – Apr 4Aug 12 – Aug 26
LakewoodMar 22 – Apr 5Aug 12 – Aug 26
ThorntonMar 21 – Apr 4Aug 16 – Aug 30
WestminsterMar 21 – Apr 4Aug 16 – Aug 30
ArvadaMar 24 – Apr 7Aug 10 – Aug 24
CentennialMar 24 – Apr 7Aug 13 – Aug 27
PuebloMar 19 – Apr 2Aug 14 – Aug 28
GreeleyMar 21 – Apr 4Aug 13 – Aug 27
BoulderMar 25 – Apr 8Aug 10 – Aug 24
Highlands RanchMar 24 – Apr 7Aug 13 – Aug 27
LongmontMar 26 – Apr 9Aug 10 – Aug 24
LovelandMar 29 – Apr 12Aug 6 – Aug 20
BroomfieldMar 21 – Apr 4Aug 16 – Aug 30
Grand JunctionMar 3 – Mar 17Aug 28 – Sep 11
Castle RockMar 28 – Apr 11Aug 7 – Aug 21
Commerce CityMar 23 – Apr 6Aug 13 – Aug 27
ParkerMar 28 – Apr 11Aug 8 – Aug 22
LittletonMar 21 – Apr 4Aug 16 – Aug 30
NorthglennMar 21 – Apr 4Aug 16 – Aug 30
BrightonMar 22 – Apr 5Aug 12 – Aug 26
Dakota RidgeMar 21 – Apr 4Aug 16 – Aug 30
EnglewoodMar 21 – Apr 4Aug 16 – Aug 30
Security-WidefieldMar 22 – Apr 5Aug 13 – Aug 27
WindsorMar 22 – Apr 5Aug 11 – Aug 25
Ken CarylMar 21 – Apr 4Aug 16 – Aug 30
Wheat RidgeMar 24 – Apr 7Aug 10 – Aug 24
Pueblo WestMar 15 – Mar 29Aug 18 – Sep 1

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 spinach in Colorado?

In a typical Colorado location, sow outdoors Mar 22 – Apr 5. Across the state, the outdoor planting window starts as early as Mar 3 in Grand Junction and as late as May 10 in Edwards. For a fall crop, plant around Aug 13 – Aug 27.

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 spinach take to grow?

Spinach typically take 40–50 days from planting to harvest. Very cold-hardy; direct sow 4-6 weeks before last frost as soon as soil can be worked.

Other Crops in Colorado

When to plant spinach in other states

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