Frost Dates for Big Sandy, MT

Elevation: 844 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 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 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 May 24
First Fall Frost September 20

Hard Freeze (28°F)

Last Spring Hard Freeze May 4
First Fall Hard Freeze October 4
48.13°N, 110.06°W © OpenStreetMap

Growing Season

131 Days May 17 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 4a

Avg. annual minimum: −30 to −25°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
January31°20°10°
February35°24°13°
March46°34°22°
April58°46°33°
May68°55°41°
June76°62°49°
July86°70°55°
August85°69°53°
September74°59°44°
October59°46°33°
November44°33°22°
December34°23°13°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January0.0
February0.0
March0.8
April4.8
May5.9
June5.8
July5.0
August5.7
September5.4
October5.2
November1.5
December0.0

Sunrise / Sunset

Daylight Longest: 15h 52m · Shortest: 8h 08m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:43 AM4:17 PM8h 34m
February7:01 AM4:59 PM9h 58m
March6:13 AM5:47 PM11h 35m
April5:17 AM6:43 PM13h 25m
May4:31 AM7:29 PM14h 59m
June4:05 AM7:55 PM15h 50m
July4:16 AM7:44 PM15h 29m
August4:56 AM7:04 PM14h 07m
September5:50 AM6:10 PM12h 20m
October6:44 AM5:16 PM10h 33m
November7:31 AM4:29 PM8h 58m
December7:55 AM4:05 PM8h 10m

Nearby Stations

Loma, MTMay 20 - September 19 Rudyard 19s, MT May 23 - September 19 Ft Assiniboine, MT May 15 - September 24 Havre City Co AP, MT May 15 - September 23 Gildford, MTMay 24 - September 15 Ft Benton, MT May 15 - September 22

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