Iowa · 100 stations
Iowa Frost Dates: 100 Weather Stations
100 NOAA weather stations in Iowa with at least 25 years of frost records.
| Station | Zone | Last spring frost (50%) | First fall frost (50%) | Frost-free days |
|---|---|---|---|---|
| Albia, IA | 5b | April 24 | October 16 | 173 |
| Allison, IA | 5a | April 27 | October 8 | 165 |
| Ames, IA | 5a | April 23 | October 14 | 173 |
| Ankeny, IA | 5b | April 23 | October 15 | 173 |
| Atlantic, IA | 5a | April 30 | October 2 | 153 |
| Audubon, IA | 5a | May 2 | October 3 | 154 |
| Beaconsfield, IA | 5b | April 23 | October 17 | 176 |
| Bedford, IA | 5b | April 24 | October 15 | 173 |
| Belle Plaine, IA | 5a | April 28 | October 10 | 165 |
| Bloomfield, IA | 5b | April 16 | October 22 | 188 |
| Boone, IA | 5a | April 28 | October 12 | 165 |
| Burlington (Airport), IA | 6a | April 15 | October 20 | 187 |
| Carroll, IA | 5a | April 27 | October 10 | 166 |
| Cascade, IA | 5a | April 28 | October 10 | 164 |
| Castana Experiment Farm, IA | 5b | April 25 | October 12 | 170 |
| Cedar Rapids, IA | 5a | April 27 | October 11 | 165 |
| Chariton, IA | 5b | May 5 | October 5 | 151 |
| Charles City, IA | 5a | April 30 | October 6 | 157 |
| Cherokee, IA | 5a | May 4 | October 4 | 152 |
| Clarinda, IA | 5b | April 25 | October 11 | 168 |
| Cresco, IA | 4b | May 8 | October 1 | 147 |
| Creston, IA | 5b | April 28 | October 11 | 164 |
| Decorah, IA | 4b | May 3 | October 7 | 157 |
| Denison, IA | 5a | April 27 | October 11 | 166 |
| Des Moines, IA | 5b | April 18 | October 20 | 184 |
| Dubuque, IA | 5a | April 28 | October 11 | 165 |
| Dubuque Lock and Dam 11, IA | 5a | April 19 | October 21 | 184 |
| Eldora, IA | 5a | April 27 | October 10 | 165 |
| Elkader, IA | 4b | May 8 | October 1 | 146 |
| Estherville, IA | 5a | May 2 | October 3 | 153 |
| Fairfield, IA | 5b | April 27 | October 12 | 168 |
| Fayette, IA | 5a | May 4 | October 4 | 151 |
| Forest City, IA | 5a | April 30 | October 7 | 159 |
| Fort Dodge, IA | 5a | April 28 | October 8 | 162 |
| Fort Madison, IA | 6a | April 12 | October 25 | 194 |
| Greenfield, IA | 5b | April 25 | October 12 | 170 |
| Grinnell, IA | 5a | May 3 | October 6 | 155 |
| Grundy Center, IA | 5a | April 29 | October 9 | 160 |
| Guthrie Center, IA | 5a | May 2 | October 3 | 153 |
| Hampton, IA | 5a | April 29 | October 9 | 162 |
| Hawarden, IA | 5a | May 1 | October 4 | 155 |
| Indianola, IA | 5b | April 24 | October 12 | 168 |
| Iowa City, IA | 5b | April 29 | October 9 | 162 |
| Iowa Falls, IA | 5a | April 28 | October 10 | 164 |
| Jefferson, IA | 5b | April 26 | October 9 | 164 |
| Keosauqua, IA | 5b | April 26 | October 13 | 169 |
| Lake Park, IA | 5a | April 30 | October 10 | 164 |
| Lamoni, IA | 5b | April 17 | October 21 | 184 |
| Le Mars, IA | 5a | April 30 | October 4 | 157 |
| Logan, IA | 5b | April 29 | October 8 | 162 |
| Maquoketa, IA | 5a | April 25 | October 14 | 171 |
| Marshalltown, IA | 5a | April 28 | October 7 | 162 |
| Mason City, IA | 5a | April 29 | October 7 | 161 |
| Mason City (Airport), IA | 5a | May 3 | October 1 | 150 |
| Milford, IA | 5a | May 1 | October 6 | 158 |
| Mount Ayr, IA | 5b | April 25 | October 12 | 169 |
| Mount Pleasant, IA | 5b | April 30 | October 10 | 163 |
| Muscatine, IA | 5b | April 24 | October 14 | 172 |
| New Hampton, IA | 5a | May 2 | October 5 | 155 |
| Newton, IA | 5b | April 22 | October 17 | 174 |
| Northwood, IA | 5a | May 4 | October 4 | 152 |
| Oakland, IA | 5b | April 23 | October 14 | 174 |
| Osage, IA | 5a | April 30 | October 9 | 163 |
| Osceola, IA | 5b | April 29 | October 9 | 162 |
| Oskaloosa, IA | 5b | April 21 | October 16 | 176 |
| Perry, IA | 5a | April 25 | October 10 | 166 |
| Pocahontas, IA | 5a | April 26 | October 7 | 164 |
| Primghar, IA | 5a | April 29 | October 10 | 163 |
| Red Oak, IA | 5b | April 24 | October 13 | 169 |
| Rock Rapids, IA | 5a | May 1 | October 4 | 156 |
| Rockwell City, IA | 5a | April 26 | October 10 | 167 |
| Sac City, IA | 5a | April 30 | October 6 | 158 |
| Sanborn, IA | 5a | May 1 | October 7 | 160 |
| Sheldon, IA | 4b | May 5 | September 28 | 145 |
| Shenandoah, IA | 5b | April 20 | October 17 | 179 |
| Sibley, IA | 4b | May 5 | October 3 | 152 |
| Sidney, IA | 6a | April 19 | October 19 | 182 |
| Sigourney, IA | 5b | April 24 | October 15 | 172 |
| Sioux Center, IA | 5a | April 30 | October 3 | 154 |
| Sioux Rapids, IA | 5a | April 30 | October 5 | 159 |
| Spencer, IA | 5a | May 1 | October 3 | 154 |
| Storm Lake, IA | 5a | April 25 | October 13 | 170 |
| Toledo, IA | 5a | April 30 | October 9 | 162 |
| Tripoli, IA | 5a | April 29 | October 9 | 162 |
| Vinton, IA | 5a | May 3 | October 3 | 151 |
| Washington, IA | 5b | April 28 | October 11 | 165 |
| Waterloo, IA | 5a | April 27 | October 10 | 165 |
| Webster City, IA | 5a | May 3 | October 2 | 150 |
| Williamsburg, IA | 5a | April 28 | October 9 | 164 |
| near Bellevue, IA | 5a | April 25 | October 16 | 172 |
| near Burlington, IA | 6a | April 18 | October 20 | 185 |
| near Camanche, IA | 5b | April 22 | October 16 | 175 |
| near Guttenberg, IA | 5a | April 21 | October 18 | 178 |
| near Keokuk, IA | 6a | April 10 | October 27 | 198 |
| near Le Claire, IA | 5b | April 16 | October 25 | 190 |
| near Manchester, IA | 5a | May 3 | October 4 | 154 |
| near Mapleton, IA | 5a | May 3 | October 1 | 151 |
| near Marion, IA | 5b | April 28 | October 12 | 166 |
| near Ottumwa, IA | 5b | April 23 | October 14 | 172 |
| near Sioux City, IA | 5a | April 29 | October 5 | 159 |