Frost Dates for Crow Agency, MT

Based on data from Hardin weather station, 11 miles away

Elevation: 3038 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 13
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 19
First Fall Frost September 23

Hard Freeze (28°F)

Last Spring Hard Freeze May 1
First Fall Hard Freeze October 7
45.60°N, 107.46°W © OpenStreetMap

Growing Season

139 Days May 13 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.
Dfa Hot-Summer Continental

Hot summers and cold winters with year-round precipitation. Moderate growing season supports warm-season crops like tomatoes, peppers, and corn. Winter protection extends the harvest.

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
January36°24°11°
February41°28°15°
March53°38°23°
April62°47°32°
May71°56°41°
June81°65°50°
July91°73°56°
August90°72°53°
September79°62°44°
October64°48°33°
November48°35°22°
December38°25°13°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.2
February1.7
March2.4
April3.8
May4.3
June3.4
July3.1
August2.7
September3.8
October2.8
November1.7
December2.3

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
January7:54 AM4:46 PM8h 52m
February7:21 AM5:29 PM10h 08m
March7:32 AM7:09 PM11h 37m
April6:32 AM7:50 PM13h 18m
May5:45 AM8:28 PM14h 43m
June5:26 AM8:56 PM15h 30m
July5:41 AM8:51 PM15h 11m
August6:16 AM8:13 PM13h 57m
September6:56 AM7:14 PM12h 18m
October7:36 AM6:16 PM10h 40m
November7:19 AM4:32 PM9h 13m
December7:51 AM4:21 PM8h 30m

Nearby Stations

Hysham 25 Sse, MT May 26 - September 16 Yellowtail Dam, MT May 7 - October 5 Huntley Exp Stn, MT May 12 - September 25 Busby, MTMay 23 - September 15 Pompeys Pillar 15n, MT May 22 - September 22 Billings Wtp, MT May 10 - October 1

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