iowa frost dates, county by county.

Adair County

Last spring: 04-16 · First fall: 10-23

Adams County

Last spring: 04-16 · First fall: 10-23

Allamakee County

Last spring: 04-21 · First fall: 10-22

Appanoose County

Last spring: 04-17 · First fall: 10-24

Audubon County

Last spring: 04-22 · First fall: 10-14

Benton County

Last spring: 04-25 · First fall: 10-12

Black Hawk County

Last spring: 04-16 · First fall: 10-20

Boone County

Last spring: 04-16 · First fall: 10-22

Bremer County

Last spring: 04-18 · First fall: 10-20

Buchanan County

Last spring: 04-20 · First fall: 10-17

Buena Vista County

Last spring: 04-15 · First fall: 10-23

Butler County

Last spring: 04-16 · First fall: 10-20

Calhoun County

Last spring: 04-16 · First fall: 10-21

Carroll County

Last spring: 04-16 · First fall: 10-21

Cass County

Last spring: 04-22 · First fall: 10-12

Cedar County

Last spring: 04-12 · First fall: 10-25

Cerro Gordo County

Last spring: 04-24 · First fall: 10-11

Cherokee County

Last spring: 04-24 · First fall: 10-15

Chickasaw County

Last spring: 04-20 · First fall: 10-15

Clarke County

Last spring: 04-18 · First fall: 10-20

Clay County

Last spring: 04-22 · First fall: 10-14

Clayton County

Last spring: 04-27 · First fall: 10-11

Clinton County

Last spring: 04-14 · First fall: 10-24

Crawford County

Last spring: 04-17 · First fall: 10-22

Dallas County

Last spring: 04-16 · First fall: 10-22

Davis County

Last spring: 04-06 · First fall: 10-31

Decatur County

Last spring: 04-19 · First fall: 10-19

Delaware County

Last spring: 04-23 · First fall: 10-15

Des Moines County

Last spring: 03-31 · First fall: 11-07

Dickinson County

Last spring: 04-21 · First fall: 10-17

Dubuque County

Last spring: 04-17 · First fall: 10-21

Emmet County

Last spring: 04-22 · First fall: 10-14

Fayette County

Last spring: 04-25 · First fall: 10-15

Floyd County

Last spring: 04-21 · First fall: 10-17

Franklin County

Last spring: 04-19 · First fall: 10-20

Fremont County

Last spring: 04-09 · First fall: 10-29

Greene County

Last spring: 04-15 · First fall: 10-21

Grundy County

Last spring: 04-19 · First fall: 10-18

Guthrie County

Last spring: 04-23 · First fall: 10-15

Hamilton County

Last spring: 04-24 · First fall: 10-12

Hancock County

Last spring: 04-18 · First fall: 10-17

Hardin County

Last spring: 04-16 · First fall: 10-21

Harrison County

Last spring: 04-19 · First fall: 10-19

Henry County

Last spring: 04-17 · First fall: 10-20

Howard County

Last spring: 04-29 · First fall: 10-11

Humboldt County

Last spring: 04-16 · First fall: 10-23

Ida County

Last spring: 04-17 · First fall: 10-21

Iowa County

Last spring: 04-18 · First fall: 10-19

Jackson County

Last spring: 04-14 · First fall: 10-24

Jasper County

Last spring: 04-12 · First fall: 10-26

Jefferson County

Last spring: 04-15 · First fall: 10-22

Johnson County

Last spring: 04-09 · First fall: 10-28

Jones County

Last spring: 04-21 · First fall: 10-16

Keokuk County

Last spring: 04-12 · First fall: 10-24

Kossuth County

Last spring: 04-20 · First fall: 10-18

Lee County

Last spring: 04-07 · First fall: 11-01

Linn County

Last spring: 04-17 · First fall: 10-22

Louisa County

Last spring: 04-15 · First fall: 10-21

Lucas County

Last spring: 04-26 · First fall: 10-16

Lyon County

Last spring: 04-21 · First fall: 10-16

Madison County

Last spring: 04-20 · First fall: 10-15

Mahaska County

Last spring: 04-11 · First fall: 10-27

Marion County

Last spring: 04-10 · First fall: 10-29

Marshall County

Last spring: 04-17 · First fall: 10-18

Mills County

Last spring: 04-12 · First fall: 10-21

Mitchell County

Last spring: 04-17 · First fall: 10-20

Monona County

Last spring: 04-15 · First fall: 10-23

Monroe County

Last spring: 04-12 · First fall: 10-26

Montgomery County

Last spring: 04-15 · First fall: 10-23

Muscatine County

Last spring: 04-07 · First fall: 10-31

O'Brien County

Last spring: 04-18 · First fall: 10-21

Osceola County

Last spring: 04-25 · First fall: 10-13

Page County

Last spring: 04-14 · First fall: 10-21

Palo Alto County

Last spring: 04-16 · First fall: 10-20

Plymouth County

Last spring: 04-20 · First fall: 10-16

Pocahontas County

Last spring: 04-16 · First fall: 10-17

Polk County

Last spring: 04-13 · First fall: 10-25

Pottawattamie County

Last spring: 04-15 · First fall: 10-25

Poweshiek County

Last spring: 04-23 · First fall: 10-17

Ringgold County

Last spring: 04-14 · First fall: 10-23

Sac County

Last spring: 04-19 · First fall: 10-17

Scott County

Last spring: 04-12 · First fall: 10-24

Shelby County

Last spring: 04-17 · First fall: 10-20

Sioux County

Last spring: 04-21 · First fall: 10-14

Story County

Last spring: 04-14 · First fall: 10-23

Tama County

Last spring: 04-19 · First fall: 10-20

Taylor County

Last spring: 04-14 · First fall: 10-26

Union County

Last spring: 04-17 · First fall: 10-23

Van Buren County

Last spring: 04-14 · First fall: 10-23

Wapello County

Last spring: 04-13 · First fall: 10-24

Warren County

Last spring: 04-14 · First fall: 10-21

Washington County

Last spring: 04-17 · First fall: 10-22

Wayne County

Last spring: 04-11 · First fall: 10-27

Webster County

Last spring: 04-17 · First fall: 10-19

Winnebago County

Last spring: 04-18 · First fall: 10-18

Winneshiek County

Last spring: 04-22 · First fall: 10-17

Woodbury County

Last spring: 04-19 · First fall: 10-18

Worth County

Last spring: 04-24 · First fall: 10-13

Wright County

Last spring: 04-19 · First fall: 10-19