Frost Dates for Arlington, WA

Elevation: 31 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. April 22
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. October 19

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 April 28
First Fall Frost October 12

Hard Freeze (28°F)

Last Spring Hard Freeze March 25
First Fall Hard Freeze November 3
48.20°N, 122.13°W © OpenStreetMap

Growing Season

180 Days April 22 to October 19

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 7b

Avg. annual minimum: 5 to 10°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) Hard Frost (28°F)
Temperature table
Average monthly temperatures (°F)
Month Avg High Avg Temp Avg Low
January47°38°29°
February51°39°28°
March54°43°32°
April60°48°35°
May67°54°41°
June71°58°45°
July77°63°48°
August78°62°47°
September72°57°42°
October61°49°37°
November52°42°31°
December46°37°28°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January5.8
February5.1
March5.6
April4.7
May4.2
June3.9
July3.0
August3.9
September4.5
October5.7
November6.6
December6.3

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 52m · Shortest: 8h 08m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January8:01 AM4:35 PM8h 34m
February7:24 AM5:22 PM9h 57m
March7:31 AM7:06 PM11h 35m
April6:26 AM7:52 PM13h 26m
May5:35 AM8:34 PM14h 59m
June5:13 AM9:04 PM15h 51m
July5:29 AM8:59 PM15h 29m
August6:09 AM8:16 PM14h 07m
September6:53 AM7:13 PM12h 20m
October7:37 AM6:10 PM10h 33m
November7:25 AM4:22 PM8h 57m
December7:60 AM4:09 PM8h 09m

Nearby Stations

Everett, WAMarch 24 - November 2 Mt Vernon 3 Wnw, WA March 24 - November 3 Sedro-Woolley, WA March 27 - November 6 Everett Snohomish AP, WA March 9 - November 17 Darrington Rs, WA April 16 - October 23 Monroe, WAApril 17 - October 23

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