Frost dates for Missoula

◇ Station-based · 83/100 confidence

Last spring frost · safe

May 26

~10% frost risk · typical May 15

First fall frost · safe

Sep 14

~10% frost risk · typical Oct 4

Frost-free days

138

May 15 → Oct 4

Climate zone

Continental, dry warm summer

Köppen Dsb

The growing year

Frost-bounded season with crops mapped onto the 12-month axis.

Frost risk Growing Harvest

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

FROST

GROWING SEASON — 138 DAYS

MAY 15

OCT 4