Frost Dates for Palouse, WA

Based on data from Potlatch 3 Nne weather station, 11 miles away

Elevation: 2434 ft

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 15
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. September 21

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 23
First Fall Frost September 12

Hard Freeze (28°F)

Last Spring Hard Freeze April 28
First Fall Hard Freeze October 5
46.91°N, 117.08°W © OpenStreetMap

Growing Season

129 Days May 15 to September 21

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 6b

Avg. annual minimum: −5 to 0°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dsb Warm-Summer Continental (Dry Summer)

Warm, dry summers and cold, snowy winters. Common in mountain regions. Moderate growing season with irrigation needs in summer.

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
January37°31°26°
February41°34°26°
March48°39°30°
April56°45°34°
May65°53°40°
June71°58°45°
July82°65°49°
August84°66°48°
September74°58°42°
October59°47°35°
November44°37°30°
December36°31°25°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January5.2
February4.8
March5.7
April4.7
May5.6
June5.4
July2.8
August0.0
September4.7
October5.6
November6.2
December6.1

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 41m · Shortest: 8h 19m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:35 AM4:18 PM8h 43m
February7:01 AM5:03 PM10h 03m
March7:09 AM6:45 PM11h 36m
April6:07 AM7:29 PM13h 22m
May5:18 AM8:09 PM14h 51m
June4:58 AM8:38 PM15h 40m
July5:13 AM8:33 PM15h 20m
August5:51 AM7:53 PM14h 02m
September6:32 AM6:51 PM12h 19m
October7:14 AM5:51 PM10h 37m
November6:60 AM4:05 PM9h 05m
December7:33 AM3:53 PM8h 20m

Nearby Stations

Moscow U Of I, ID Pullman Moscow Rgnl AP, WA April 29 - October 2 Pullman 2 Nw, WA May 6 - September 29 Plummer 3 Wsw, ID May 11 - October 5 Saint Maries, IDMay 3 - October 4 Rosalia, WAMay 7 - September 28

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