Average First Frost Dates for Idaho

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

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List of Average First Frost Dates for Locations in Idaho

LocationAverage First Frost Dates
AmmonSep. 21 - Sep. 30
BlackfootSep.11 - Sep. 20
BoiseOct. 11 - Oct. 20
BurleyOct. 1 - Oct. 10
CaldwellOct. 11 - Oct. 20
ChubbuckSep.11 - Sep. 20
Coeur d'AleneOct. 1 - Oct. 10
EagleOct. 11 - Oct. 20
EmmettOct. 11 - Oct. 20
FruitlandOct. 11 - Oct. 20
Garden CityOct. 11 - Oct. 20
HaileySep.11 - Sep. 20
HaydenOct. 1 - Oct. 10
Idaho FallsSep. 21 - Sep. 30
JeromeOct. 1 - Oct. 10
KunaOct. 11 - Oct. 20
LewistonOct. 21 - Oct. 31
MeridianOct. 11 - Oct. 20
MiddletonOct. 11 - Oct. 20
MoscowSep.11 - Sep. 20
Mountain HomeOct. 1 - Oct. 10
NampaOct. 11 - Oct. 20
PayetteOct. 11 - Oct. 20
PocatelloSep.11 - Sep. 20
Post FallsOct. 1 - Oct. 10
PrestonSep. 21 - Sep. 30
RathdrumOct. 1 - Oct. 10
RexburgSep.11 - Sep. 20
RigbySep.11 - Sep. 20
RupertOct. 1 - Oct. 10
SandpointSep.11 - Sep. 20
StarOct. 11 - Oct. 20
Twin FallsOct. 1 - Oct. 10
WeiserOct. 11 - Oct. 20

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