Frost dates for Philadelphia

◇ Station-based · 87/100 confidence

Last spring frost · safe

Apr 10

~10% frost risk · typical Mar 28

First fall frost · safe

Nov 7

~10% frost risk · typical Nov 22

Frost-free days

234

Mar 28 → Nov 22

Climate zone

Humid subtropical

Köppen Cfa

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 — 234 DAYS

MAR 28

NOV 22