Frost dates for Calgary

◇ Station-based · 82/100 confidence

Last spring frost · safe

Jun 10

~10% frost risk · typical May 22

First fall frost · safe

Sep 7

~10% frost risk · typical Sep 19

Frost-free days

120

May 22 → Sep 19

Climate zone

Subarctic

Köppen Dfc

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 — 120 DAYS

MAY 22

SEP 19