Frost Dates for Spokane Wfo, WA

Elevation: 729 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 10
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 26

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 17
First Fall Frost September 19

Hard Freeze (28°F)

Last Spring Hard Freeze April 25
First Fall Hard Freeze October 7
47.68°N, 117.63°W © OpenStreetMap

Growing Season

139 Days May 10 to September 26

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 6a

Avg. annual minimum: −10 to −5°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
January33°28°23°
February39°31°24°
March48°39°29°
April57°45°34°
May66°54°41°
June72°59°47°
July83°68°52°
August83°67°51°
September73°58°43°
October57°45°34°
November41°34°27°
December32°27°22°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January3.0
February2.6
March3.0
April2.3
May2.3
June2.1
July1.1
August1.4
September1.9
October2.7
November3.2
December3.3

Sunrise / Sunset

Daylight Pacific Time (PT) Longest: 15h 48m · Shortest: 8h 12m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Pacific Time (PT))
Month Sunrise Sunset Daylight
January7:41 AM4:19 PM8h 38m
February7:05 AM5:05 PM9h 60m
March7:13 AM6:48 PM11h 35m
April6:09 AM7:33 PM13h 24m
May5:19 AM8:15 PM14h 56m
June4:58 AM8:44 PM15h 46m
July5:13 AM8:39 PM15h 25m
August5:52 AM7:57 PM14h 05m
September6:35 AM6:55 PM12h 19m
October7:18 AM5:53 PM10h 34m
November7:05 AM4:06 PM9h 01m
December7:39 AM3:53 PM8h 14m

Nearby Stations

Spokane Intl AP, WA April 26 - October 12 Spokane Felts Fld, WA April 26 - October 15 Spokane 17 Ssw, WA May 30 - September 4 Deer Park AP, WA May 22 - September 14 Davenport, WA June 6 - September 11 Harrington, WA May 31 - September 12

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