Frost Dates for Carlyle 13 Nw, MT

Elevation: 959 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 18
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 29

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 23
First Fall Frost September 22

Hard Freeze (28°F)

Last Spring Hard Freeze May 6
First Fall Hard Freeze October 6
46.74°N, 104.31°W © OpenStreetMap

Growing Season

134 Days May 18 to September 29

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 4b

Avg. annual minimum: −25 to −20°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
January27°18°9°
February30°21°12°
March42°31°21°
April53°42°31°
May63°52°41°
June73°62°50°
July82°69°57°
August82°69°55°
September71°59°46°
October55°44°33°
November40°31°22°
December30°21°13°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.3
February1.3
March1.6
April2.3
May3.5
June3.9
July4.2
August3.6
September3.6
October2.4
November1.5
December1.6

Sunrise / Sunset

Daylight Longest: 15h 40m · Shortest: 8h 20m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (local solar time)
Month Sunrise Sunset Daylight
January7:38 AM4:22 PM8h 44m
February6:58 AM5:02 PM10h 04m
March6:12 AM5:48 PM11h 36m
April5:19 AM6:41 PM13h 21m
May4:35 AM7:25 PM14h 50m
June4:11 AM7:49 PM15h 38m
July4:21 AM7:39 PM15h 18m
August4:60 AM7:00 PM14h 01m
September5:51 AM6:09 PM12h 19m
October6:41 AM5:19 PM10h 37m
November7:27 AM4:33 PM9h 07m
December7:49 AM4:11 PM8h 22m

Nearby Stations

Wibaux 2 E, MT May 27 - September 16 Beach, NDMay 16 - September 26 Plevna, MTMay 21 - September 20 Baker, MTMay 12 - September 26 Baker Muni AP, MT May 16 - September 26 Mildred 5 N, MT May 20 - September 22

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