Frost Dates for Plain, WA

Elevation: 590 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 22
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 22

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 31
First Fall Frost September 16

Hard Freeze (28°F)

Last Spring Hard Freeze May 3
First Fall Hard Freeze October 4
47.78°N, 120.65°W © OpenStreetMap

Growing Season

123 Days May 22 to September 22

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
January34°28°21°
February40°31°23°
March48°38°27°
April57°45°32°
May67°53°39°
June73°59°45°
July82°66°50°
August82°66°49°
September74°58°42°
October58°46°33°
November42°34°27°
December32°27°21°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January5.3
February3.7
March3.7
April2.3
May2.7
June2.2
July0.8
August0.5
September2.3
October3.8
November4.8
December5.1

Sunrise / Sunset

Daylight Longest: 15h 49m · Shortest: 8h 12m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:42 AM4:18 PM8h 37m
February7:00 AM4:60 PM9h 59m
March6:12 AM5:48 PM11h 35m
April5:18 AM6:42 PM13h 24m
May4:32 AM7:28 PM14h 56m
June4:07 AM7:53 PM15h 47m
July4:17 AM7:43 PM15h 26m
August4:57 AM7:03 PM14h 06m
September5:50 AM6:10 PM12h 20m
October6:43 AM5:17 PM10h 34m
November7:30 AM4:30 PM8h 60m
December7:54 AM4:06 PM8h 13m

Nearby Stations

Leavenworth 3 S, WA May 10 - September 30 Entiat Fish Hatchery, WA April 5 - October 24 Waterville, WAMay 14 - October 1 Wenatchee, WAApril 4 - October 28 Holden Village, WA May 25 - September 19 Chelan, WAApril 17 - October 22

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