Frost Dates for Pullman, WA

Based on data from Pullman 2 Nw weather station, 2 miles away

Elevation: 2352 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 6
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 29

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 September 22

Hard Freeze (28°F)

Last Spring Hard Freeze April 19
First Fall Hard Freeze October 12
46.73°N, 117.18°W © OpenStreetMap

Growing Season

146 Days May 6 to September 29

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
January38°32°26°
February42°35°27°
March50°40°31°
April57°46°35°
May66°54°42°
June73°60°46°
July84°67°50°
August85°68°50°
September76°60°44°
October61°49°36°
November46°38°31°
December37°31°25°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January3.9
February3.3
March3.7
April3.4
May3.6
June2.9
July2.0
August2.0
September2.8
October3.6
November4.0
December4.2

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 40m · Shortest: 8h 20m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:36 AM4:20 PM8h 44m
February7:02 AM5:05 PM10h 04m
March7:10 AM6:46 PM11h 36m
April6:08 AM7:30 PM13h 21m
May5:20 AM8:10 PM14h 50m
June4:60 AM8:38 PM15h 38m
July5:15 AM8:33 PM15h 18m
August5:52 AM7:53 PM14h 01m
September6:34 AM6:53 PM12h 19m
October7:15 AM5:52 PM10h 37m
November7:01 AM4:07 PM9h 07m
December7:34 AM3:55 PM8h 22m

Nearby Stations

Pullman Moscow Rgnl AP, WA April 29 - October 2 Moscow U Of I, ID Potlatch 3 Nne, ID May 15 - September 21 Pomeroy, WAMay 2 - October 4 Lewiston Nez Perce Co AP, ID April 6 - October 26 St John, WAApril 29 - October 4

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