Frost Dates for Seattle Tacoma Intl AP, WA

Elevation: 113 m

Frost Dates

Last Spring Frost (50%) A 50% chance that the last spring frost has already passed by this date. Most gardeners use this as their primary planting guide. March 2
First Fall Frost (50%) A 50% chance that the first fall frost has occurred by this date. Plan to harvest or protect tender plants before this date. November 23

30% Probability

Only a 30% chance of frost remaining by this date. Use these dates for a safer planting window, especially for tender plants sensitive to cold.
Last Spring Frost March 12
First Fall Frost November 14

Hard Freeze (28°F)

Last Spring Hard Freeze February 4
First Fall Hard Freeze December 10
47.44°N, 122.31°W © OpenStreetMap

Growing Season

266 Days March 2 to November 23

USDA Hardiness Zone

Hardiness zones indicate which perennial plants can survive winter in your area. For annual vegetables, frost dates and growing season length matter more than hardiness zone.
Zone 9a

Avg. annual minimum: 20 to 25°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Csb Warm-Summer Mediterranean

Warm, dry summers and mild, wet winters. Similar to hot-summer Mediterranean but cooler. Great for a wide range of vegetables and fruit trees with moderate water needs.

Köppen climate map

Temperature

Avg High Avg Temp Avg Low Light Frost (32°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January48°43°38°
February50°44°38°
March54°47°40°
April59°51°43°
May66°58°49°
June71°62°53°
July77°67°57°
August78°67°57°
September72°63°54°
October61°54°47°
November52°47°41°
December47°42°37°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January5.2
February4.1
March4.6
April3.7
May3.2
June2.5
July1.9
August2.5
September2.8
October4.5
November5.8
December5.5

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 46m · Shortest: 8h 15m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:59 AM4:38 PM8h 39m
February7:23 AM5:24 PM10h 01m
March7:31 AM7:07 PM11h 35m
April6:28 AM7:51 PM13h 23m
May5:38 AM8:33 PM14h 54m
June5:17 AM9:01 PM15h 44m
July5:33 AM8:57 PM15h 23m
August6:11 AM8:15 PM14h 04m
September6:54 AM7:13 PM12h 19m
October7:37 AM6:12 PM10h 35m
November7:23 AM4:25 PM9h 02m
December7:57 AM4:13 PM8h 16m

Nearby Stations

Kent, WAMarch 20 - November 10 Renton Muni AP, WA March 13 - November 16 Seattle Boeing Fld, WA March 13 - November 17 Tacoma #1, WA March 8 - November 14 Seattle Sand Pt Wsfo, WA March 8 - November 23 Landsburg, WA April 20 - October 25

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