Average First Frost Dates for Wyoming

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First Frost Dates were calculated using daily climate data from the period between 1991-2020.

List of Average First Frost Dates for Locations in Wyoming

Location	Average First Frost Dates
Casper	Sep. 21 - Sep. 30
Cheyenne	Oct. 1 - Oct. 10
Cody	Oct. 1 - Oct. 10
Douglas	Oct. 1 - Oct. 10
Evanston	Sep.1 - Sep. 10
Gillette	Sep. 21 - Sep. 30
Green River	Sep.1 - Sep. 10
Jackson	July 21 - July 31
Lander	Oct. 1 - Oct. 10
Laramie	Sep.1 - Sep. 10
Powell	Sep.11 - Sep. 20

Ranchettes	Sep. 21 - Sep. 30
Rawlins	Sep.11 - Sep. 20
Riverton	Sep. 21 - Sep. 30
Rock Springs	Sep. 21 - Sep. 30
Sheridan	Sep. 21 - Sep. 30
Torrington	Sep.11 - Sep. 20

List of Average First Frost Dates for Locations in Wyoming

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