Frost dates for Denver

◇ Station-based · 85/100 confidence

Last spring frost · safe

May 21

~10% frost risk · typical May 4

First fall frost · safe

Sep 25

~10% frost risk · typical Oct 10

Frost-free days

157

May 4 → Oct 10

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 — 157 DAYS

MAY 4

OCT 10