Frost Dates in Iowa
Below is the likelihood of experiencing 32°F on or before the given date in fall and on or after the given date in spring.
Links to high-population counties are below, and all counties are listed alphabetically.
"Early" = only 10% of all freeze dates happened before this day.
"Average" = the average freeze date for this location.
"Late" = only 10% of all freeze dates happened after this day.
This information is based on weather data collected from 1950-2021.*
Date of First Freeze in Fall | Date of Last Freeze in Spring
Quick Links to Populus Counties
| Polk County | First Fall Freeze | Last Spring Freeze | Des Moines, West Des Moines, Ankeny, Urbandale, Johnston, Altoona, Clive |
| Linn County | First Fall Freeze | Last Spring Freeze | Cedar Rapids, Marion |
| Scott County | First Fall Freeze | Last Spring Freeze | Davenport, Bettendorf |
| Johnson County | First Fall Freeze | Last Spring Freeze | Iowa City, Coralville, North Liberty |
| Black Hawk County | First Fall Freeze | Last Spring Freeze | Waterloo, Cedar Falls |
| Woodbury County | First Fall Freeze | Last Spring Freeze | Sioux City |
| Dallas County | First Fall Freeze | Last Spring Freeze | Waukee, West Des Moines, Urbandale, Clive, Grimes |
| Dubuque County | First Fall Freeze | Last Spring Freeze | Dubuque |
| Story County | First Fall Freeze | Last Spring Freeze | Ames |
| Pottawattamie County | First Fall Freeze | Last Spring Freeze | Council Bluffs |
| Warren County | First Fall Freeze | Last Spring Freeze | Indianola, Norwalk |
| Clinton County | First Fall Freeze | Last Spring Freeze | Clinton |
| Muscatine County | First Fall Freeze | Last Spring Freeze | Muscatine |
| Cerro Gordo County | First Fall Freeze | Last Spring Freeze | Mason City |
| Marshall County | First Fall Freeze | Last Spring Freeze | Marshalltown |
Date of First Freeze in Fall
Listed alphabetically by county.
"Early" = only 10% of all freeze dates happened before this day.
"Average" = the average freeze date for this location.
"Late" = only 10% of all freeze dates happened after this day.
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|---|---|---|---|
|
Adair |
Sep 26 |
Oct 07 |
Oct 23 |
|
Adams |
Sep 26 |
Oct 08 |
Oct 25 |
|
Allamakee |
Sep 26 |
Oct 07 |
Oct 21 |
|
Appanoose |
Sep 30 |
Oct 14 |
Oct 28 |
|
Audubon |
Sep 21 |
Oct 03 |
Oct 15 |
|
Benton |
Sep 22 |
Oct 05 |
Oct 17 |
|
Sep 22 |
Oct 05 |
Oct 18 |
|
|
Boone |
Sep 23 |
Oct 06 |
Oct 20 |
|
Bremer |
Sep 22 |
Oct 05 |
Oct 19 |
|
Buchanan |
Sep 20 |
Oct 03 |
Oct 14 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
Buena Vista |
Sep 23 |
Oct 06 |
Oct 23 |
|
Butler |
Sep 27 |
Oct 07 |
Oct 22 |
|
Calhoun |
Sep 27 |
Oct 07 |
Oct 20 |
|
Carroll |
Sep 21 |
Oct 03 |
Oct 19 |
|
Cass |
Sep 21 |
Oct 05 |
Oct 18 |
|
Cedar |
Sep 24 |
Oct 09 |
Oct 22 |
|
Sep 22 |
Oct 05 |
Oct 19 |
|
|
Cherokee |
Sep 19 |
Oct 02 |
Oct 15 |
|
Chickasaw |
Sep 22 |
Oct 05 |
Oct 18 |
|
Clarke |
Sep 26 |
Oct 10 |
Oct 25 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
Clay |
Sep 22 |
Oct 05 |
Oct 18 |
|
Clayton |
Sep 21 |
Oct 03 |
Oct 15 |
|
Oct 01 |
Oct 14 |
Oct 28 |
|
|
Crawford |
Sep 23 |
Oct 06 |
Oct 20 |
|
Sep 22 |
Oct 06 |
Oct 18 |
|
|
Davis |
Oct 01 |
Oct 15 |
Oct 28 |
|
Decatur |
Sep 29 |
Oct 12 |
Oct 29 |
|
Delaware |
Sep 21 |
Oct 03 |
Oct 14 |
|
Des Moines |
Oct 03 |
Oct 19 |
Nov 03 |
|
Dickinson |
Sep 22 |
Oct 04 |
Oct 19 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
Sep 26 |
Oct 09 |
Oct 22 |
|
|
Emmet |
Sep 22 |
Oct 04 |
Oct 20 |
|
Fayette |
Sep 20 |
Oct 02 |
Oct 15 |
|
Floyd |
Sep 27 |
Oct 07 |
Oct 21 |
|
Franklin |
Sep 21 |
Oct 05 |
Oct 19 |
|
Fremont |
Sep 30 |
Oct 13 |
Oct 27 |
|
Greene |
Sep 24 |
Oct 06 |
Oct 21 |
|
Grundy |
Sep 23 |
Oct 06 |
Oct 20 |
|
Guthrie |
Sep 21 |
Oct 04 |
Oct 16 |
|
Hamilton |
Sep 21 |
Oct 05 |
Oct 16 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
Hancock |
Sep 22 |
Oct 05 |
Oct 18 |
|
Hardin |
Sep 23 |
Oct 06 |
Oct 19 |
|
Harrison |
Sep 26 |
Apr 16 |
Oct 20 |
|
Henry |
Oct 01 |
Oct 15 |
Oct 29 |
|
Howard |
Sep 20 |
Oct 02 |
Oct 13 |
|
Humboldt |
Sep 23 |
Oct 07 |
Oct 23 |
|
Ida |
Sep 21 |
Oct 04 |
Oct 15 |
|
Iowa |
Sep 23 |
Oct 07 |
Oct 19 |
|
Jackson |
Sep 27 |
Oct 09 |
Oct 22 |
|
Jasper |
Sep 26 |
Oct 09 |
Oct 25 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
Jefferson |
Sep 30 |
Oct 13 |
Oct 28 |
|
Sep 27 |
Oct 09 |
Oct 22 |
|
|
Jones |
Sep 22 |
Oct 05 |
Oct 17 |
|
Keokuk |
Sep 30 |
Oct 13 |
Oct 28 |
|
Kossuth |
Sep 25 |
Oct 06 |
Oct 18 |
|
Lee |
Oct 06 |
Oct 19 |
Nov 02 |
|
Sep 25 |
Oct 06 |
Oct 18 |
|
|
Louisa |
Oct 01 |
Oct 14 |
Oct 28 |
|
Lucas |
Sep 27 |
Oct 08 |
Oct 21 |
|
Lyon |
Sep 19 |
Sep 30 |
Oct 14 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
Madison |
Sep 23 |
Oct 07 |
Oct 21 |
|
Mahaska |
Sep 27 |
Oct 11 |
Oct 27 |
|
Marion |
Sep 29 |
Oct 11 |
Oct 28 |
|
Sep 26 |
Oct 08 |
Oct 21 |
|
|
Mills |
Sep 28 |
Oct 10 |
Oct 27 |
|
Mitchell |
Sep 23 |
Oct 06 |
Oct 19 |
|
Monona |
Sep 26 |
Oct 07 |
Oct 22 |
|
Monroe |
Sep 30 |
Oct 14 |
Oct 28 |
|
Montgomery |
Sep 23 |
Oct 08 |
Oct 24 |
|
Sep 30 |
Oct 14 |
Oct 28 |
|
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
O'Brien |
Sep 22 |
Oct 04 |
Oct 16 |
|
Osceola |
Sep 21 |
Oct 03 |
Oct 15 |
|
Page |
Sep 27 |
Oct 09 |
Oct 26 |
|
Palo Alto |
Sep 25 |
Oct 07 |
Oct 23 |
|
Plymouth |
Sep 20 |
Oct 02 |
Oct 16 |
|
Pocahontas |
Sep 23 |
Oct 06 |
Oct 20 |
|
Sep 26 |
Oct 10 |
Oct 26 |
|
|
Sep 26 |
Oct 08 |
Oct 26 |
|
|
Poweshiek |
Sep 25 |
Oct 07 |
Oct 21 |
|
Ringgold |
Sep 27 |
Oct 11 |
Oct 27 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
Sac |
Sep 24 |
Oct 07 |
Oct 24 |
|
Oct 05 |
Oct 19 |
Nov 02 |
|
|
Shelby |
Sep 22 |
Oct 06 |
Oct 18 |
|
Sioux |
Sep 19 |
Oct 01 |
Oct 14 |
|
Sep 26 |
Oct 07 |
Oct 21 |
|
|
Tama |
Sep 22 |
Oct 08 |
Oct 18 |
|
Taylor |
Sep 27 |
Oct 10 |
Oct 27 |
|
Union |
Sep 27 |
Oct 10 |
Oct 28 |
|
Van Buren |
Oct 01 |
Oct 15 |
Oct 28 |
|
Wapello |
Oct 01 |
Oct 15 |
Oct 28 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
|
Sep 27 |
Oct 10 |
Oct 23 |
|
|
Washington |
Sep 28 |
Oct 12 |
Oct 27 |
|
Wayne |
Sep 30 |
Oct 12 |
Oct 27 |
|
Webster |
Sep 23 |
Oct 07 |
Oct 20 |
|
Winnebago |
Sep 22 |
Oct 04 |
Oct 15 |
|
Winneshiek |
Sep 21 |
Oct 03 |
Oct 15 |
|
Sep 21 |
Oct 04 |
Oct 16 |
|
|
Worth |
Sep 23 |
Oct 05 |
Oct 18 |
|
Wright |
Sep 21 |
Oct 03 |
Oct 15 |
|
County |
Early First Fall Freeze (32°F) |
Average First Fall Freeze (32°F) |
Late First Fall Freeze (32°F) |
Date of Last Freeze in Spring
Listed alphabetically by county.
"Early" = only 10% of all freeze dates happened before this day.
"Average" = the average freeze date for this location.
"Late" = only 10% of all freeze dates happened after this day.
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|---|---|---|---|
|
Adair |
Apr 11 |
Apr 25 |
May 10 |
|
Adams |
Apr 11 |
Apr 24 |
May 08 |
|
Allamakee |
Apr 09 |
Apr 26 |
May 11 |
|
Appanoose |
Apr 05 |
Apr 17 |
May 03 |
|
Audubon |
Apr 13 |
Apr 27 |
May 11 |
|
Benton |
Apr 13 |
Apr 25 |
May 08 |
|
Apr 14 |
Apr 28 |
May 11 |
|
|
Boone |
Apr 13 |
Apr 26 |
May 08 |
|
Bremer |
Apr 13 |
Apr 28 |
May 11 |
|
Buchanan |
Apr 16 |
Apr 29 |
May 14 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
Buena Vista |
Apr 12 |
Apr 28 |
May 11 |
|
Butler |
Apr 13 |
Apr 27 |
May 10 |
|
Calhoun |
Apr 13 |
Apr 26 |
May 08 |
|
Carroll |
Apr 13 |
Apr 27 |
May 09 |
|
Cass |
Apr 11 |
Apr 26 |
May 11 |
|
Cedar |
Apr 09 |
Apr 23 |
May 06 |
|
Apr 15 |
Apr 29 |
May 11 |
|
|
Cherokee |
Apr 16 |
May 01 |
May 14 |
|
Chickasaw |
Apr 16 |
Apr 29 |
May 11 |
|
Clarke |
Apr 09 |
Apr 23 |
May 08 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
Clay |
Apr 12 |
Apr 28 |
May 11 |
|
Clayton |
Apr 16 |
Apr 29 |
May 12 |
|
Apr 06 |
Apr 18 |
May 02 |
|
|
Crawford |
Apr 09 |
Apr 25 |
May 09 |
|
Apr 10 |
Apr 25 |
May 08 |
|
|
Davis |
Apr 03 |
Apr 15 |
Apr 29 |
|
Decatur |
Apr 07 |
Apr 20 |
May 03 |
|
Delaware |
Apr 16 |
May 01 |
May 15 |
|
Des Moines |
Apr 03 |
Apr 15 |
Apr 28 |
|
Dickinson |
Apr 14 |
Apr 28 |
May 10 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
Apr 10 |
Apr 23 |
May 06 |
|
|
Emmet |
Apr 15 |
Apr 28 |
May 10 |
|
Fayette |
Apr 18 |
May 01 |
May 15 |
|
Floyd |
Apr 13 |
Apr 27 |
May 10 |
|
Franklin |
Apr 17 |
Apr 28 |
May 11 |
|
Fremont |
Apr 05 |
Apr 17 |
Apr 30 |
|
Greene |
Apr 13 |
Apr 26 |
May 09 |
|
Grundy |
Apr 16 |
Apr 27 |
May 10 |
|
Guthrie |
Apr 13 |
Apr 27 |
May 09 |
|
Hamilton |
Apr 13 |
Apr 29 |
May 13 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
Hancock |
Apr 14 |
Apr 28 |
May 11 |
|
Hardin |
Apr 13 |
Apr 26 |
May 09 |
|
Harrison |
Apr 11 |
Apr 24 |
May 07 |
|
Henry |
Apr 05 |
Apr 17 |
Apr 30 |
|
Howard |
Apr 21 |
May 03 |
May 15 |
|
Humboldt |
Apr 11 |
Apr 27 |
May 09 |
|
Ida |
Apr 14 |
Apr 29 |
May 12 |
|
Iowa |
Apr 10 |
Apr 24 |
May 06 |
|
Jackson |
Apr 10 |
Apr 25 |
May 08 |
|
Jasper |
Apr 09 |
Apr 22 |
May 05 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
Jefferson |
Apr 05 |
Apr 17 |
May 01 |
|
Apr 09 |
Apr 22 |
May 06 |
|
|
Jones |
Apr 16 |
Apr 29 |
May 13 |
|
Keokuk |
Apr 07 |
Apr 19 |
May 03 |
|
Kossuth |
Apr 14 |
Apr 28 |
May 11 |
|
Lee |
Apr 04 |
Apr 13 |
Apr 25 |
|
Apr 14 |
Apr 26 |
May 09 |
|
|
Louisa |
Apr 05 |
Apr 17 |
May 02 |
|
Lucas |
Apr 10 |
Apr 24 |
May 07 |
|
Lyon |
Apr 18 |
May 01 |
May 14 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
Madison |
Apr 10 |
Apr 25 |
May 09 |
|
Mahaska |
Apr 08 |
Apr 20 |
May 03 |
|
Marion |
Apr 06 |
Apr 20 |
May 03 |
|
Apr 13 |
Apr 24 |
May 08 |
|
|
Mills |
Apr 08 |
Apr 22 |
May 08 |
|
Mitchell |
Apr 16 |
Apr 30 |
May 11 |
|
Monona |
Apr 09 |
Apr 26 |
May 10 |
|
Monroe |
Apr 06 |
Apr 19 |
May 03 |
|
Montgomery |
Apr 09 |
Apr 24 |
May 09 |
|
Apr 05 |
Apr 17 |
Apr 30 |
|
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
O'Brien |
Apr 15 |
Apr 29 |
May 14 |
|
Osceola |
Apr 17 |
Apr 30 |
May 14 |
|
Page |
Apr 08 |
Apr 22 |
May 06 |
|
Palo Alto |
Apr 14 |
Apr 27 |
May 10 |
|
Plymouth |
Apr 15 |
Apr 28 |
May 12 |
|
Pocahontas |
Apr 10 |
Apr 26 |
May 09 |
|
Apr 09 |
Apr 22 |
May 04 |
|
|
Apr 09 |
Apr 24 |
May 08 |
|
|
Poweshiek |
Apr 13 |
Apr 26 |
May 09 |
|
Ringgold |
Apr 08 |
Apr 21 |
May 06 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
Sac |
Apr 09 |
Apr 26 |
May 09 |
|
Apr 05 |
Apr 15 |
Apr 30 |
|
|
Shelby |
Apr 09 |
Apr 24 |
May 09 |
|
Sioux |
Apr 18 |
May 01 |
May 13 |
|
Apr 13 |
Apr 24 |
May 06 |
|
|
Tama |
Apr 14 |
Apr 27 |
May 10 |
|
Taylor |
Apr 09 |
Apr 22 |
May 06 |
|
Union |
Apr 09 |
Apr 23 |
May 07 |
|
Van Buren |
Apr 05 |
Apr 18 |
May 01 |
|
Wapello |
Apr 05 |
Apr 16 |
Apr 30 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
|
Apr 09 |
Apr 23 |
May 06 |
|
|
Washington |
Apr 07 |
Apr 20 |
May 04 |
|
Wayne |
Apr 07 |
Apr 20 |
May 03 |
|
Webster |
Apr 13 |
Apr 26 |
May 09 |
|
Winnebago |
Apr 14 |
Apr 28 |
May 10 |
|
Winneshiek |
Apr 18 |
May 02 |
May 18 |
|
Apr 09 |
Apr 26 |
May 10 |
|
|
Worth |
Apr 17 |
Apr 28 |
May 11 |
|
Wright |
Apr 14 |
Apr 29 |
May 25 |
|
County |
Early Last Spring Freeze Date (32°F) |
Average Last Spring Freeze Date (32°F) |
Late Last Spring Freeze Date (32°F) |
More Information
* This data was provided by the Midwestern Regional Climate Center (MRCC). Visit that website to get more detailed information and statistics.