Frost dates for Portland

◇ Station-based · 88/100 confidence

Last spring frost · safe

Mar 17

~10% frost risk · typical Mar 1

First fall frost · safe

Nov 1

~10% frost risk · typical Nov 22

Frost-free days

266

Mar 1 → Nov 22

Climate zone

Mediterranean, warm summer

Köppen Csb

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 — 266 DAYS

MAR 1

NOV 22