Last frost dates in Montana

Typical last frost
May 9

That is the date for the typical Montana resident, weighted by city population. Across the state the average last frost runs from May 4 to June 13, so look up your own town below.

Earliest city
May 4
Latest city
Jun 13
Typical first frost
Oct 1
Cities
7
This week in Montana

Frost in the forecast for 7 of 7 cities

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

May 1Jun 1May 15Jun 15NSBillings: May 4BillingsMissoula: May 10MissoulaGreat Falls: May 6Great FallsBozeman: May 26BozemanButte-Silver Bow: Jun 13Butte-Silver BowHelena: May 9HelenaKalispell: May 31Kalispell
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
BillingsMay 4May 18Oct 7156 days
MissoulaMay 10May 28Oct 1143 days
Great FallsMay 6May 19Oct 1147 days
BozemanMay 26Jun 14Sep 22116 days
Butte-Silver BowJun 13Jul 1Sep 583 days
HelenaMay 9May 25Sep 30142 days
KalispellMay 31Jun 22Sep 10100 days

When to plant in Montana

Questions

When is the last frost in Montana?

It depends on where you are. Across the 7 cities we track, the average last frost runs from May 4 to June 13. In Billings, the largest, it is May 4.

When is the first frost in Montana?

For a typical resident, around October 1. Higher and more northern towns get it earlier.