Frost Dates for Lyman, WY

Based on data from Mtn View weather station, 5 miles away

Elevation: 6706 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. June 14
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 9

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 June 21
First Fall Frost September 3

Hard Freeze (28°F)

Last Spring Hard Freeze May 30
First Fall Hard Freeze September 20
41.33°N, 110.29°W © OpenStreetMap

Growing Season

87 Days June 14 to September 9

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 5b

Avg. annual minimum: −15 to −10°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°11°
February34°22°11°
March44°32°20°
April52°39°25°
May63°48°33°
June73°56°40°
July80°63°47°
August78°62°45°
September70°54°37°
October57°42°28°
November41°29°17°
December31°21°11°

Precipitation

Precipitation table
Average monthly precipitation (inches)
MonthPrecipitation
January1.7
February1.4
March2.1
April2.5
May2.3
June2.1
July2.2
August1.9
September2.4
October2.6
November2.1
December2.0

Sunrise / Sunset

Daylight Mountain Time (MT) Longest: 14h 59m · Shortest: 9h 01m
Sunrise and sunset table
Sunrise, sunset, and daylight on the 15th of each month (Mountain Time (MT))
Month Sunrise Sunset Daylight
January7:51 AM5:11 PM9h 20m
February7:24 AM5:48 PM10h 24m
March7:41 AM7:21 PM11h 40m
April6:48 AM7:55 PM13h 07m
May6:08 AM8:27 PM14h 19m
June5:53 AM8:50 PM14h 58m
July6:06 AM8:48 PM14h 42m
August6:36 AM8:15 PM13h 39m
September7:08 AM7:24 PM12h 16m
October7:41 AM6:32 PM10h 52m
November7:17 AM4:56 PM9h 38m
December7:46 AM4:48 PM9h 02m

Nearby Stations

Church Buttes Gas Plt, WY May 25 - September 27 Evanston 1 E, WY June 12 - September 12 Evanston Burns Fld, WY June 3 - September 25 Manila, UTMay 22 - September 29 Buckboard Marina, WY May 24 - September 23 Kemmerer 2n, WY

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