Frost dates for Grand Rapids

◇ Station-based · 87/100 confidence

Last spring frost · safe

May 16

~10% frost risk · typical Apr 30

First fall frost · safe

Oct 1

~10% frost risk · typical Oct 16

Frost-free days

166

Apr 30 → Oct 16

Climate zone

Continental, hot summer

Köppen Dfa

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 — 166 DAYS

APR 30

OCT 16