Last frost dates in Colorado

Typical last frost
May 3

That is the date for the typical Colorado resident, weighted by city population. Across the state the average last frost runs from April 14 to May 10, so look up your own town below.

Earliest city
Apr 14
Latest city
May 10
Typical first frost
Oct 8
Cities
34
This week in Colorado

Frost in the forecast for 1 of 34 cities

National Weather Service forecast, updated Oct 22, 11:10 UTC

May 1Apr 15May 15NSDenver: May 4DenverColorado Springs: May 3Colorado SpringsAurora: May 7Fort Collins: May 2Fort CollinsLakewood: May 3Thornton: May 2ThorntonArvada: May 5Westminster: May 2Greeley: May 2Pueblo: Apr 30Centennial: May 5Boulder: May 6Longmont: May 7Loveland: May 10Broomfield: May 2Commerce City: May 3Grand Junction: Apr 14Littleton: May 2Brighton: May 3Windsor: May 3Erie: May 7Northglenn: May 2Security-Widefield: May 3Englewood: May 2Pueblo West: Apr 26Wheat Ridge: May 5Lafayette: May 2Fountain: May 3Evans: May 2Johnstown: May 10Four Square Mile: May 7Montrose: Apr 28Louisville: May 6Firestone: May 7
Each dot is a city: further right means a later last frost, higher up means further north. Bigger dots are bigger cities.

Frost dates by city

CityLast frostSafe afterFirst frostSeason
DenverMay 4May 16Oct 8156 days
Colorado SpringsMay 3May 15Oct 8158 days
AuroraMay 7May 21Oct 8152 days
Fort CollinsMay 2May 14Oct 7157 days
LakewoodMay 3May 18Oct 7155 days
ThorntonMay 2May 14Oct 11160 days
ArvadaMay 5May 18Oct 5151 days
WestminsterMay 2May 14Oct 11160 days
GreeleyMay 2May 14Oct 8159 days
PuebloApr 30May 12Oct 9162 days
CentennialMay 5May 17Oct 8154 days
BoulderMay 6May 18Oct 5151 days
LongmontMay 7May 22Oct 5151 days
LovelandMay 10May 22Oct 1142 days
BroomfieldMay 2May 14Oct 11160 days
Commerce CityMay 3May 16Oct 7155 days
Grand JunctionApr 14Apr 28Oct 23190 days
LittletonMay 2May 17Oct 11160 days
BrightonMay 3May 16Oct 7155 days
WindsorMay 3May 15Oct 6154 days
ErieMay 7May 22Oct 5151 days
NorthglennMay 2May 14Oct 11160 days
Security-WidefieldMay 3May 15Oct 8158 days
EnglewoodMay 2May 17Oct 11160 days
Pueblo WestApr 26May 8Oct 13166 days
Wheat RidgeMay 5May 18Oct 5151 days
LafayetteMay 2May 14Oct 11160 days
FountainMay 3May 15Oct 8158 days
EvansMay 2May 14Oct 8159 days
JohnstownMay 10May 22Oct 1142 days
Four Square MileMay 7May 21Oct 8152 days
MontroseApr 28May 12Oct 14167 days
LouisvilleMay 6May 18Oct 5151 days
FirestoneMay 7May 22Oct 5151 days

When to plant in Colorado

Questions

When is the last frost in Colorado?

It depends on where you are. Across the 34 cities we track, the average last frost runs from April 14 to May 10. In Denver, the largest, it is May 4.

When is the first frost in Colorado?

For a typical resident, around October 8. Higher and more northern towns get it earlier.