Frost Dates for Four Corners, MT

Based on data from Bozeman 6 W Exp Farm weather station, 2 miles away

Elevation: 4839 ft

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 23

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 31
First Fall Frost September 16

Hard Freeze (28°F)

Last Spring Hard Freeze May 2
First Fall Hard Freeze October 3
45.66°N, 111.19°W © OpenStreetMap

Growing Season

123 Days May 23 to September 23

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
January34°25°15°
February37°27°17°
March47°36°25°
April55°43°31°
May65°52°39°
June72°59°45°
July83°67°51°
August82°66°50°
September72°57°42°
October58°45°33°
November43°33°22°
December34°24°15°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.7
February1.9
March2.3
April3.1
May3.8
June3.5
July3.0
August3.0
September3.4
October3.3
November2.2
December1.9

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 15h 31m · Shortest: 8h 29m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January8:08 AM5:00 PM8h 52m
February7:35 AM5:43 PM10h 08m
March7:46 AM7:23 PM11h 37m
April6:46 AM8:04 PM13h 18m
May5:59 AM8:42 PM14h 43m
June5:40 AM9:10 PM15h 29m
July5:55 AM9:05 PM15h 10m
August6:31 AM8:27 PM13h 56m
September7:10 AM7:28 PM12h 18m
October7:50 AM6:30 PM10h 40m
November7:33 AM4:46 PM9h 13m
December8:05 AM4:36 PM8h 30m

Nearby Stations

Bozeman Montana State Univ, MT May 26 - September 22 Bozeman Gallatin Fld, MT May 26 - September 16 Logan Landfill, MT May 26 - September 15 Trident, MTMay 9 - September 27 Norris Madison Pwr House, MT April 30 - October 10 Big Sky 2wnw, MT

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