Frost Dates for Ritzville 1 Sse, WA

Elevation: 568 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 7
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 10

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 13
First Fall Frost October 4

Hard Freeze (28°F)

Last Spring Hard Freeze April 25
First Fall Hard Freeze October 21
47.12°N, 118.37°W © OpenStreetMap

Growing Season

156 Days May 7 to October 10

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 7a

Avg. annual minimum: 0 to 5°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

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
January36°30°24°
February42°34°26°
March51°40°30°
April60°47°34°
May69°55°41°
June76°62°47°
July87°70°53°
August86°70°53°
September77°61°46°
October62°49°36°
November45°37°29°
December35°29°23°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.6
February2.3
March3.0
April2.5
May2.9
June2.5
July0.9
August0.0
September1.8
October2.6
November2.8
December2.9

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 43m · Shortest: 8h 17m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:42 AM4:24 PM8h 42m
February7:07 AM5:09 PM10h 02m
March7:15 AM6:51 PM11h 36m
April6:13 AM7:35 PM13h 22m
May5:24 AM8:16 PM14h 52m
June5:03 AM8:44 PM15h 41m
July5:19 AM8:40 PM15h 21m
August5:56 AM7:59 PM14h 03m
September6:38 AM6:58 PM12h 19m
October7:21 AM5:57 PM10h 36m
November7:06 AM4:11 PM9h 04m
December7:40 AM3:59 PM8h 19m

Nearby Stations

Lind 3 Ne, WAMay 7 - October 4 Odessa, WAMay 14 - September 26 Harrington, WA May 31 - September 12 Hatton 9 Se, WA April 25 - October 15 Lacrosse, WAMay 13 - September 26 St John, WAApril 29 - October 4

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