Frost dates for Billings

◇ Station-based · 90/100 confidence

Last spring frost · safe

May 20

~10% frost risk · typical May 8

First fall frost · safe

Sep 18

~10% frost risk · typical Oct 4

Frost-free days

150

May 8 → Oct 4

Climate zone

Cold semi-arid

Köppen BSk

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 — 150 DAYS

MAY 8

OCT 4