Frost Dates for Glenns Ferry, ID

Elevation: 752 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 1
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. October 3

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 6
First Fall Frost September 26

Hard Freeze (28°F)

Last Spring Hard Freeze April 15
First Fall Hard Freeze October 16
42.94°N, 115.32°W © OpenStreetMap

Growing Season

155 Days May 1 to October 3

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 7a

Avg. annual minimum: 0 to 5°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
BSk Cold Semi-Arid (Steppe)

Cool to cold with low rainfall and wide temperature swings. Common in the western Great Plains and central Asia. Short growing seasons benefit from season extension techniques.

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
January44°34°25°
February50°38°27°
March60°46°32°
April68°53°38°
May79°62°46°
June88°70°53°
July99°79°59°
August97°77°56°
September86°66°46°
October71°54°36°
November55°42°29°
December44°34°25°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.7
February1.9
March2.1
April1.9
May2.2
June1.5
July0.0
August0.0
September1.0
October2.7
November2.7
December2.9

Sunrise / Sunset

Daylight Longest: 15h 10m · Shortest: 8h 50m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:25 AM4:35 PM9h 10m
February6:51 AM5:09 PM10h 18m
March6:11 AM5:49 PM11h 39m
April5:24 AM6:36 PM13h 11m
May4:46 AM7:14 PM14h 28m
June4:25 AM7:35 PM15h 09m
July4:34 AM7:26 PM14h 52m
August5:07 AM6:53 PM13h 46m
September5:52 AM6:08 PM12h 17m
October6:36 AM5:24 PM10h 48m
November7:15 AM4:45 PM9h 29m
December7:35 AM4:25 PM8h 51m

Nearby Stations

Hagerman 2 Sw, ID May 3 - October 1 Mtn Home, IDMay 2 - October 8 Bruneau, IDApril 17 - October 17 Hill City 1 W, ID June 16 - September 6 Castleford 2 N, ID May 17 - September 29 Buhl #2, IDApril 25 - October 15

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