Frost Dates for Sunnyside, WA

Elevation: 228 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. May 1
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 6

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 May 7
First Fall Frost October 2

Hard Freeze (28°F)

Last Spring Hard Freeze April 15
First Fall Hard Freeze October 19
46.32°N, 120.01°W © OpenStreetMap

Growing Season

158 Days May 1 to October 6

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.
BWk Cold Desert

Dry with hot summers and cold winters. Rainfall is minimal year-round. Short growing seasons and large temperature swings require careful timing. Cold-hardy, drought-tolerant plants are best suited.

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
January38°30°23°
February45°35°24°
March55°43°30°
April63°49°36°
May73°58°44°
June79°64°49°
July88°71°54°
August87°69°52°
September78°61°45°
October64°49°35°
November48°38°27°
December37°30°22°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.8
February1.6
March1.9
April1.6
May2.0
June1.6
July0.0
August0.0
September0.7
October1.7
November1.6
December2.0

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 36m · Shortest: 8h 24m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:46 AM4:33 PM8h 48m
February7:12 AM5:17 PM10h 05m
March7:22 AM6:58 PM11h 36m
April6:20 AM7:40 PM13h 20m
May5:33 AM8:20 PM14h 47m
June5:13 AM8:48 PM15h 35m
July5:28 AM8:43 PM15h 15m
August6:05 AM8:04 PM13h 59m
September6:45 AM7:04 PM12h 19m
October7:26 AM6:04 PM10h 38m
November7:10 AM4:20 PM9h 09m
December7:43 AM4:08 PM8h 25m

Nearby Stations

Sunnyside #2, WA April 30 - October 8 Moxee City 10 E, WA May 4 - October 10 Prosser, WAApril 14 - October 22 Wapato, WAApril 21 - October 15 Priest Rapids Dam, WA March 24 - November 4 Bickleton, WAMay 16 - October 9

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