Frost dates · Iowa
Iowa 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.
Howard County
Spring Apr 29·Fall Oct 11165-day season
Clayton County
Spring Apr 27·Fall Oct 11167-day season
Lucas County
Spring Apr 26·Fall Oct 16173-day season
Benton County
Spring Apr 25·Fall Oct 12170-day season
Fayette County
Spring Apr 25·Fall Oct 15173-day season
Osceola County
Spring Apr 25·Fall Oct 13171-day season
Cerro Gordo County
Spring Apr 24·Fall Oct 11170-day season
Cherokee County
Spring Apr 24·Fall Oct 15174-day season
Hamilton County
Spring Apr 24·Fall Oct 12171-day season
Worth County
Spring Apr 24·Fall Oct 13172-day season
Delaware County
Spring Apr 23·Fall Oct 15175-day season
Guthrie County
Spring Apr 23·Fall Oct 15175-day season
Poweshiek County
Spring Apr 23·Fall Oct 17177-day season
Audubon County
Spring Apr 22·Fall Oct 14175-day season
Cass County
Spring Apr 22·Fall Oct 12173-day season
Clay County
Spring Apr 22·Fall Oct 14175-day season
Emmet County
Spring Apr 22·Fall Oct 14175-day season
Winneshiek County
Spring Apr 22·Fall Oct 17178-day season
Allamakee County
Spring Apr 21·Fall Oct 22184-day season
Dickinson County
Spring Apr 21·Fall Oct 17179-day season
Floyd County
Spring Apr 21·Fall Oct 17179-day season
Jones County
Spring Apr 21·Fall Oct 16178-day season
Lyon County
Spring Apr 21·Fall Oct 16178-day season
Sioux County
Spring Apr 21·Fall Oct 14176-day season
Buchanan County
Spring Apr 20·Fall Oct 17180-day season
Chickasaw County
Spring Apr 20·Fall Oct 15178-day season
Kossuth County
Spring Apr 20·Fall Oct 18181-day season
Madison County
Spring Apr 20·Fall Oct 15178-day season
Plymouth County
Spring Apr 20·Fall Oct 16179-day season
Decatur County
Spring Apr 19·Fall Oct 19183-day season
Franklin County
Spring Apr 19·Fall Oct 20184-day season
Grundy County
Spring Apr 19·Fall Oct 18182-day season
Harrison County
Spring Apr 19·Fall Oct 19183-day season
Sac County
Spring Apr 19·Fall Oct 17181-day season
Tama County
Spring Apr 19·Fall Oct 20184-day season
Woodbury County
Spring Apr 19·Fall Oct 18182-day season
Wright County
Spring Apr 19·Fall Oct 19183-day season
Bremer County
Spring Apr 18·Fall Oct 20185-day season
Clarke County
Spring Apr 18·Fall Oct 20185-day season
Hancock County
Spring Apr 18·Fall Oct 17182-day season
Iowa County
Spring Apr 18·Fall Oct 19184-day season
O'Brien County
Spring Apr 18·Fall Oct 21186-day season
Winnebago County
Spring Apr 18·Fall Oct 18183-day season
Appanoose County
Spring Apr 17·Fall Oct 24190-day season
Crawford County
Spring Apr 17·Fall Oct 22188-day season
Dubuque County
Spring Apr 17·Fall Oct 21187-day season
Henry County
Spring Apr 17·Fall Oct 20186-day season
Ida County
Spring Apr 17·Fall Oct 21187-day season
Linn County
Spring Apr 17·Fall Oct 22188-day season
Marshall County
Spring Apr 17·Fall Oct 18184-day season
Mitchell County
Spring Apr 17·Fall Oct 20186-day season
Shelby County
Spring Apr 17·Fall Oct 20186-day season
Union County
Spring Apr 17·Fall Oct 23189-day season
Washington County
Spring Apr 17·Fall Oct 22188-day season
Webster County
Spring Apr 17·Fall Oct 19185-day season
Adair County
Spring Apr 16·Fall Oct 23190-day season
Adams County
Spring Apr 16·Fall Oct 23190-day season
Black Hawk County
Spring Apr 16·Fall Oct 20187-day season
Boone County
Spring Apr 16·Fall Oct 22189-day season
Butler County
Spring Apr 16·Fall Oct 20187-day season
Calhoun County
Spring Apr 16·Fall Oct 21188-day season
Carroll County
Spring Apr 16·Fall Oct 21188-day season
Dallas County
Spring Apr 16·Fall Oct 22189-day season
Hardin County
Spring Apr 16·Fall Oct 21188-day season
Humboldt County
Spring Apr 16·Fall Oct 23190-day season
Palo Alto County
Spring Apr 16·Fall Oct 20187-day season
Pocahontas County
Spring Apr 16·Fall Oct 17184-day season
Buena Vista County
Spring Apr 15·Fall Oct 23191-day season
Greene County
Spring Apr 15·Fall Oct 21189-day season
Jefferson County
Spring Apr 15·Fall Oct 22190-day season
Louisa County
Spring Apr 15·Fall Oct 21189-day season
Monona County
Spring Apr 15·Fall Oct 23191-day season
Montgomery County
Spring Apr 15·Fall Oct 23191-day season
Pottawattamie County
Spring Apr 15·Fall Oct 25193-day season
Clinton County
Spring Apr 14·Fall Oct 24193-day season
Jackson County
Spring Apr 14·Fall Oct 24193-day season
Page County
Spring Apr 14·Fall Oct 21190-day season
Ringgold County
Spring Apr 14·Fall Oct 23192-day season
Story County
Spring Apr 14·Fall Oct 23192-day season
Taylor County
Spring Apr 14·Fall Oct 26195-day season
Van Buren County
Spring Apr 14·Fall Oct 23192-day season
Warren County
Spring Apr 14·Fall Oct 21190-day season
Polk County
Spring Apr 13·Fall Oct 25195-day season
Wapello County
Spring Apr 13·Fall Oct 24194-day season
Cedar County
Spring Apr 12·Fall Oct 25196-day season
Jasper County
Spring Apr 12·Fall Oct 26197-day season
Keokuk County
Spring Apr 12·Fall Oct 24195-day season
Mills County
Spring Apr 12·Fall Oct 21192-day season
Monroe County
Spring Apr 12·Fall Oct 26197-day season
Scott County
Spring Apr 12·Fall Oct 24195-day season
Mahaska County
Spring Apr 11·Fall Oct 27199-day season
Wayne County
Spring Apr 11·Fall Oct 27199-day season
Marion County
Spring Apr 10·Fall Oct 29202-day season
Fremont County
Spring Apr 9·Fall Oct 29203-day season
Johnson County
Spring Apr 9·Fall Oct 28202-day season
Lee County
Spring Apr 7·Fall Nov 1208-day season
Muscatine County
Spring Apr 7·Fall Oct 31207-day season
Davis County
Spring Apr 6·Fall Oct 31208-day season
Des Moines County
Spring Mar 31·Fall Nov 7221-day season
Alphabetical · A to Z
- Adair County
- Adams County
- Allamakee County
- Appanoose County
- Audubon County
- Benton County
- Black Hawk County
- Boone County
- Bremer County
- Buchanan County
- Buena Vista County
- Butler County
- Calhoun County
- Carroll County
- Cass County
- Cedar County
- Cerro Gordo County
- Cherokee County
- Chickasaw County
- Clarke County
- Clay County
- Clayton County
- Clinton County
- Crawford County
- Dallas County
- Davis County
- Decatur County
- Delaware County
- Des Moines County
- Dickinson County
- Dubuque County
- Emmet County
- Fayette County
- Floyd County
- Franklin County
- Fremont County
- Greene County
- Grundy County
- Guthrie County
- Hamilton County
- Hancock County
- Hardin County
- Harrison County
- Henry County
- Howard County
- Humboldt County
- Ida County
- Iowa County
- Jackson County
- Jasper County
- Jefferson County
- Johnson County
- Jones County
- Keokuk County
- Kossuth County
- Lee County
- Linn County
- Louisa County
- Lucas County
- Lyon County
- Madison County
- Mahaska County
- Marion County
- Marshall County
- Mills County
- Mitchell County
- Monona County
- Monroe County
- Montgomery County
- Muscatine County
- O'Brien County
- Osceola County
- Page County
- Palo Alto County
- Plymouth County
- Pocahontas County
- Polk County
- Pottawattamie County
- Poweshiek County
- Ringgold County
- Sac County
- Scott County
- Shelby County
- Sioux County
- Story County
- Tama County
- Taylor County
- Union County
- Van Buren County
- Wapello County
- Warren County
- Washington County
- Wayne County
- Webster County
- Winnebago County
- Winneshiek County
- Woodbury County
- Worth County
- Wright County