Frost dates · Idaho
Idaho counties by frost timing.
Latest at top, earliest at bottom. In most states this matches the north-to-south gradient.
Sorted by spring frost
Latest → earliest.
Blaine County
Spring Jun 2·Fall Sep 23113-day season
Elmore County
Spring May 30·Fall Sep 18111-day season
Caribou County
Spring May 27·Fall Sep 12108-day season
Bear Lake County
Spring May 25·Fall Sep 16114-day season
Idaho County
Spring May 22·Fall Sep 7108-day season
Teton County
Spring May 22·Fall Sep 20121-day season
Bonneville County
Spring May 19·Fall Sep 23127-day season
Cassia County
Spring May 17·Fall Sep 26132-day season
Clearwater County
Spring May 17·Fall Sep 20126-day season
Valley County
Spring May 16·Fall Sep 24131-day season
Boise County
Spring May 15·Fall Sep 23131-day season
Jefferson County
Spring May 14·Fall Sep 21130-day season
Camas County
Spring May 11·Fall Sep 28140-day season
Clark County
Spring May 10·Fall Oct 2145-day season
Lincoln County
Spring May 8·Fall Oct 7152-day season
Gem County
Spring May 7·Fall Sep 29145-day season
Butte County
Spring May 6·Fall Oct 3150-day season
Lewis County
Spring May 5·Fall Oct 2150-day season
Bannock County
Spring May 4·Fall Oct 4153-day season
Oneida County
Spring May 4·Fall Oct 2151-day season
Fremont County
Spring May 3·Fall Oct 4154-day season
Lemhi County
Spring May 2·Fall Oct 5156-day season
Minidoka County
Spring May 2·Fall Oct 15166-day season
Nez Perce County
Spring May 2·Fall Oct 9160-day season
Custer County
Spring May 1·Fall Oct 7159-day season
Franklin County
Spring Apr 30·Fall Oct 10163-day season
Madison County
Spring Apr 30·Fall Oct 7160-day season
Latah County
Spring Apr 28·Fall Oct 5160-day season
Washington County
Spring Apr 28·Fall Oct 7162-day season
Twin Falls County
Spring Apr 25·Fall Oct 15173-day season
Shoshone County
Spring Apr 24·Fall Oct 14173-day season
Jerome County
Spring Apr 23·Fall Oct 17177-day season
Adams County
Spring Apr 22·Fall Oct 16177-day season
Bingham County
Spring Apr 22·Fall Oct 16177-day season
Bonner County
Spring Apr 21·Fall Oct 10172-day season
Gooding County
Spring Apr 19·Fall Oct 15179-day season
Power County
Spring Apr 19·Fall Oct 21185-day season
Benewah County
Spring Apr 14·Fall Oct 19188-day season
Boundary County
Spring Apr 10·Fall Oct 16189-day season
Canyon County
Spring Apr 5·Fall Oct 30208-day season
Ada County
Spring Apr 2·Fall Oct 31212-day season
Kootenai County
Spring Apr 1·Fall Nov 1214-day season
Payette County
Spring Mar 31·Fall Oct 31214-day season
Owyhee County
Spring Mar 30·Fall Oct 31215-day season
Alphabetical · A to Z
- Ada County
- Adams County
- Bannock County
- Bear Lake County
- Benewah County
- Bingham County
- Blaine County
- Boise County
- Bonner County
- Bonneville County
- Boundary County
- Butte County
- Camas County
- Canyon County
- Caribou County
- Cassia County
- Clark County
- Clearwater County
- Custer County
- Elmore County
- Franklin County
- Fremont County
- Gem County
- Gooding County
- Idaho County
- Jefferson County
- Jerome County
- Kootenai County
- Latah County
- Lemhi County
- Lewis County
- Lincoln County
- Madison County
- Minidoka County
- Nez Perce County
- Oneida County
- Owyhee County
- Payette County
- Power County
- Shoshone County
- Teton County
- Twin Falls County
- Valley County
- Washington County