Montana Frost Dates

Across Montana, the average last spring frost ranges from May 4 in Billings to Jun 13 in Butte-Silver Bow. Find your town below, or enter your ZIP code for the nearest station.

Largest cities

BillingsMissoulaGreat FallsBozemanButte-Silver BowHelenaKalispell

Average frost dates in Montana towns

Average (50%) dates of the last 32°F frost in spring and the first in fall, from the nearest NOAA station. Towns with 5,000+ residents.

TownLast frostFirst frostSeason (days)
Anaconda-Deer Lodge CountyJun 1Sep 14105
BelgradeMay 26Sep 16112
BillingsMay 4Oct 7156
BozemanMay 26Sep 22116
Butte-Silver BowJun 13Sep 583
Columbia FallsMay 31Sep 10100
Great FallsMay 6Oct 1147
HamiltonMay 21Sep 22122
HavreMay 15Sep 23129
HelenaMay 9Sep 30142
KalispellMay 31Sep 10100
LaurelMay 5Oct 3149
LewistownMay 23Sep 21119
LivingstonMay 27Sep 14108
Miles CityMay 8Sep 30144
MissoulaMay 10Oct 1143
PolsonMay 10Oct 5147
SidneyMay 11Sep 27137
WhitefishMay 16Sep 25129