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

LocationAverage First Frost Dates
CasperSep. 21 - Sep. 30
CheyenneOct. 1 - Oct. 10
CodyOct. 1 - Oct. 10
DouglasOct. 1 - Oct. 10
EvanstonSep.1 - Sep. 10
GilletteSep. 21 - Sep. 30
Green RiverSep.1 - Sep. 10
JacksonJuly 21 - July 31
LanderOct. 1 - Oct. 10
LaramieSep.1 - Sep. 10
PowellSep.11 - Sep. 20
RanchettesSep. 21 - Sep. 30
RawlinsSep.11 - Sep. 20
RivertonSep. 21 - Sep. 30
Rock SpringsSep. 21 - Sep. 30
SheridanSep. 21 - Sep. 30
TorringtonSep.11 - Sep. 20

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