Frost Dates for Winchester, ID

Elevation: 1211 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 23
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 25

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 June 1
First Fall Frost September 17

Hard Freeze (28°F)

Last Spring Hard Freeze May 2
First Fall Hard Freeze October 9
46.24°N, 116.62°W © OpenStreetMap

Growing Season

125 Days May 23 to September 25

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
January37°30°23°
February39°31°23°
March45°36°27°
April52°42°32°
May60°49°39°
June67°55°43°
July78°64°49°
August79°64°49°
September70°56°42°
October56°45°35°
November43°35°28°
December35°29°22°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.0
February1.9
March2.7
April2.8
May3.6
June3.6
July2.1
August2.3
September2.6
October2.8
November2.4
December2.2

Sunrise / Sunset

Daylight Longest: 15h 35m · Shortest: 8h 25m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:36 AM4:24 PM8h 48m
February6:57 AM5:03 PM10h 06m
March6:12 AM5:48 PM11h 36m
April5:20 AM6:40 PM13h 20m
May4:37 AM7:23 PM14h 46m
June4:13 AM7:47 PM15h 34m
July4:23 AM7:37 PM15h 14m
August5:01 AM6:59 PM13h 59m
September5:51 AM6:09 PM12h 19m
October6:41 AM5:19 PM10h 39m
November7:25 AM4:35 PM9h 10m
December7:47 AM4:13 PM8h 26m

Nearby Stations

Cottonwood 2 Wsw, ID May 6 - October 13 Nezperce, IDMay 24 - September 20 Lewiston Nez Perce Co AP, ID April 6 - October 26 Dworshak Fish Hatchery, ID April 20 - October 20 Kamiah, IDApril 29 - October 5 Grangeville, IDMay 9 - October 3

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