Frost Dates for Bern, ID

Elevation: 1818 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. June 17
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 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 June 25
First Fall Frost August 29

Hard Freeze (28°F)

Last Spring Hard Freeze May 25
First Fall Hard Freeze September 16
42.34°N, 111.39°W © OpenStreetMap

Growing Season

78 Days June 17 to September 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 5a

Avg. annual minimum: −20 to −15°F

Learn more

Köppen Climate

The Köppen climate classification system categorizes climates based on temperature and precipitation patterns.
Dfb Warm-Summer Continental

Warm summers and cold, snowy winters. A shorter growing season than hot-summer continental. Hardy vegetables, root crops, and cool-season greens do well. Season extension is valuable.

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
January29°18°7°
February32°20°9°
March42°30°18°
April53°40°27°
May64°49°34°
June75°57°40°
July85°65°46°
August84°64°45°
September74°55°37°
October59°43°27°
November43°31°19°
December30°20°9°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.7
February2.5
March2.8
April2.8
May3.5
June2.9
July2.0
August2.0
September3.0
October3.4
November2.3
December2.3

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 15h 06m · Shortest: 8h 54m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:58 AM5:12 PM9h 14m
February7:30 AM5:50 PM10h 21m
March7:45 AM7:25 PM11h 39m
April6:51 AM8:01 PM13h 10m
May6:10 AM8:34 PM14h 24m
June5:53 AM8:58 PM15h 05m
July6:07 AM8:55 PM14h 48m
August6:38 AM8:21 PM13h 43m
September7:12 AM7:28 PM12h 16m
October7:46 AM6:35 PM10h 49m
November7:24 AM4:57 PM9h 32m
December7:54 AM4:49 PM8h 55m

Nearby Stations

Lifton Pumping Stn, ID May 19 - September 21 Soda Springs AP, ID Grace, IDMay 29 - September 17 Bear Lake Sp, UT May 15 - October 4 Preston, IDMay 16 - September 28 Laketown, UTMay 28 - September 24

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