Frost Dates for Moorcroft, WY

Based on data from Moorcroft 3s weather station, 3 miles away

Elevation: 4226 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 22
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 28

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 29
First Fall Frost September 21

Hard Freeze (28°F)

Last Spring Hard Freeze May 10
First Fall Hard Freeze October 5
44.26°N, 104.95°W © OpenStreetMap

Growing Season

129 Days May 22 to September 28

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.
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
January32°22°12°
February34°24°13°
March46°34°23°
April54°41°29°
May63°51°39°
June75°62°49°
July86°71°57°
August84°69°54°
September74°59°44°
October59°46°32°
November44°33°22°
December34°23°12°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January2.3
February2.3
March3.6
April3.9
May5.4
June4.9
July4.0
August4.0
September3.9
October3.8
November3.0
December2.9

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 15h 20m · Shortest: 8h 40m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:38 AM4:40 PM9h 02m
February7:07 AM5:21 PM10h 14m
March7:20 AM6:58 PM11h 38m
April6:23 AM7:37 PM13h 14m
May5:39 AM8:13 PM14h 35m
June5:21 AM8:39 PM15h 18m
July5:35 AM8:36 PM15h 00m
August6:09 AM7:59 PM13h 50m
September6:46 AM7:03 PM12h 17m
October7:23 AM6:07 PM10h 44m
November7:04 AM4:26 PM9h 22m
December7:35 AM4:16 PM8h 41m

Nearby Stations

Dillinger, WY May 25 - September 17 Upton, WYMay 20 - September 23 Gillette 4se, WY May 15 - October 1 Devils Twr #2, WY May 23 - September 20 Sundance, WYMay 21 - September 25 Gillette Campbell AP, WY May 22 - September 25

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