Frost dates in Iowa
Across 150 NOAA stations in Iowa, the average last spring frost ranges from April 10 at Keokuk Lock Dam 19 to May 8 at Cresco 1 Ne.
| Albia 3 Nne | April 24 | October 16 | 173 |
| Algona | April 30 | October 6 | 160 |
| Allerton | April 21 | October 19 | 178 |
| Allison | April 27 | October 8 | 165 |
| Ames 5 Se | April 26 | October 12 | 168 |
| Ames 8 Wsw | April 23 | October 14 | 173 |
| Ames Muni Airport | April 26 | October 8 | 164 |
| Anamosa 1 Wnw | May 1 | October 4 | 154 |
| Anamosa 3 Ssw | April 27 | October 13 | 170 |
| Ankeny | April 23 | October 15 | 173 |
| Atlantic 1 Ne | April 30 | October 2 | 153 |
| Audubon | May 2 | October 3 | 154 |
| Battle Creek 3Ne | May 1 | October 1 | 153 |
| Beaconsfield | April 23 | October 17 | 176 |
| Bedford | April 24 | October 15 | 173 |
| Belle Plaine | April 28 | October 10 | 165 |
| Bellevue L&D 12 | April 25 | October 16 | 172 |
| Bloomfield | April 16 | October 22 | 188 |
| Boone | April 28 | October 12 | 165 |
| Britt 3E | April 29 | October 7 | 161 |
| Burlington 2S | April 18 | October 20 | 185 |
| Burlington Muni Airport | April 15 | October 20 | 187 |
| Carroll | April 27 | October 10 | 166 |
| Cascade | April 28 | October 10 | 164 |
| Castana Exp Farm | April 25 | October 12 | 170 |
| Cedar Rapids #1 | April 28 | October 12 | 166 |
| Cedar Rapids Muni Airport | April 27 | October 11 | 165 |
| Centerville | April 28 | October 14 | 168 |
| Chariton 1 E | May 5 | October 5 | 151 |
| Charles City | April 30 | October 6 | 157 |
| Cherokee | May 4 | October 4 | 152 |
| Clarinda | April 25 | October 11 | 168 |
| Clarion | April 30 | October 10 | 162 |
| Clinton #1 | April 22 | October 16 | 175 |
| Coggon | May 3 | October 7 | 156 |
| Colo | April 24 | October 12 | 170 |
| Columbus Junction | April 26 | October 10 | 167 |
| Corning | April 27 | October 12 | 168 |
| Cresco 1 Ne | May 8 | October 1 | 147 |
| Creston 2 Sw | April 28 | October 11 | 164 |
| Dakota City | April 26 | October 12 | 169 |
| Davenport | April 23 | October 15 | 174 |
| Davenport Wfo | April 21 | October 17 | 176 |
| Decorah | May 3 | October 7 | 157 |
| Denison | April 27 | October 11 | 166 |
| Des Moines 17 E | April 21 | October 15 | 174 |
| Des Moines Intl Airport | April 18 | October 20 | 184 |
| Des Moines Wsfo-Johnston | April 19 | October 18 | 179 |
| Donnellson | April 17 | October 22 | 187 |
| Dubuque L&D 11 | April 19 | October 21 | 184 |
| Dubuque Rgnl Airport | April 28 | October 11 | 165 |
| Eldora | April 27 | October 10 | 165 |
| Elkader 6 Ssw | May 8 | October 1 | 146 |
| Emmetsburg | April 27 | October 7 | 164 |
| Estherville 4E | May 2 | October 3 | 153 |
| Estherville Muni Airport | May 2 | September 30 | 150 |
| Fairfield | April 27 | October 12 | 168 |
| Fayette | May 4 | October 4 | 151 |
| Forest City 2 Nne | April 30 | October 7 | 159 |
| Ft Dodge 5Nnw | April 28 | October 8 | 162 |
| Ft Madison | April 12 | October 25 | 194 |
| Glenwood 3Sw | April 23 | October 11 | 170 |
| Greenfield | April 25 | October 12 | 170 |
| Grinnell 3 Sw | May 3 | October 6 | 155 |
| Grundy Ctr | April 29 | October 9 | 160 |
| Guthrie Ctr | May 2 | October 3 | 153 |
| Guttenberg L&D 10 | April 21 | October 18 | 178 |
| Hampton | April 29 | October 9 | 162 |
| Harlan | April 27 | October 9 | 165 |
| Hawarden | May 1 | October 4 | 155 |
| Holstein | April 30 | October 9 | 162 |
| Humboldt Wtp | April 27 | October 9 | 166 |
| Ida Grove 5Nw | April 27 | October 12 | 167 |
| Independence #1 | April 30 | October 7 | 159 |
| Indianola 2W | April 24 | October 12 | 168 |
| Iowa City | April 29 | October 9 | 162 |
| Iowa City Muni Airport | April 21 | October 18 | 180 |
| Iowa Falls | April 28 | October 10 | 164 |
| Jefferson | April 26 | October 9 | 164 |
| Keokuk Lock Dam 19 | April 10 | October 27 | 198 |
| Keosauqua | April 26 | October 13 | 169 |
| Knoxville | April 20 | October 19 | 180 |
| Lake Park | April 30 | October 10 | 164 |
| Lamoni | April 17 | October 21 | 184 |
| Lamoni | April 16 | October 20 | 187 |
| Lamoni Muni Airport | April 16 | October 21 | 186 |
| Le Claire L&D 14 | April 16 | October 25 | 190 |
| Le Mars | April 30 | October 4 | 157 |
| Leon 6 Ese | April 30 | October 8 | 161 |
| Little Sioux 2 Nw | May 1 | October 3 | 155 |
| Logan | April 29 | October 8 | 162 |
| Lowden | April 27 | October 10 | 165 |
| Manchester #2 | May 3 | October 4 | 154 |
| Mapleton No.2 | May 3 | October 1 | 151 |
| Maquoketa | April 25 | October 14 | 171 |
| Marshalltown | April 28 | October 7 | 162 |
| Marshalltown Muni Airport | April 30 | October 6 | 159 |
| Mason City | April 29 | October 7 | 161 |
| Mason City Muni Airport | May 3 | October 1 | 150 |
| Milford 4 Nw | May 1 | October 6 | 158 |
| Mt Ayr | April 25 | October 12 | 169 |
| Mt Pleasant 1 Ssw | April 30 | October 10 | 163 |
| Muscatine | April 24 | October 14 | 172 |
| Muscatine 2N | April 18 | October 22 | 184 |
| New Hampton | May 2 | October 5 | 155 |
| Newton | April 22 | October 17 | 174 |
| Northwood | May 4 | October 4 | 152 |
| Oakland | April 23 | October 14 | 174 |
| Oelwein 1E | April 27 | October 13 | 169 |
| Oelwein 2 S | April 30 | October 9 | 163 |
| Onawa 3Nw | May 1 | October 3 | 154 |
| Osage | April 30 | October 9 | 163 |
| Osceola | April 29 | October 9 | 162 |
| Oskaloosa | April 21 | October 16 | 176 |
| Ottumwa Industrial Airport | April 23 | October 14 | 172 |
| Perry | April 25 | October 10 | 166 |
| Pocahontas | April 26 | October 7 | 164 |
| Postville | May 1 | October 3 | 153 |
| Primghar | April 29 | October 10 | 163 |
| Rathbun Dam | April 18 | October 23 | 187 |
| Red Oak | April 24 | October 13 | 169 |
| Rock Rapids | May 1 | October 4 | 156 |
| Rockwell City | April 26 | October 10 | 167 |
| Sac City | April 30 | October 6 | 158 |
| Sanborn | May 1 | October 7 | 160 |
| Sheldon | May 5 | September 28 | 145 |
| Shenandoah | April 20 | October 17 | 179 |
| Sibley | May 5 | October 3 | 152 |
| Sidney 1Sse | April 19 | October 19 | 182 |
| Sigourney | April 24 | October 15 | 172 |
| Sioux City Ang | April 29 | October 7 | 161 |
| Sioux City Gateway Airport | April 29 | October 5 | 159 |
| Sioux Ctr 2 Se | April 30 | October 3 | 154 |
| Sioux Rapids 4 E | April 30 | October 5 | 159 |
| Spencer 1 N | May 1 | October 3 | 154 |
| Spencer Muni Airport | May 2 | October 2 | 154 |
| Spirit Lake | April 28 | October 11 | 164 |
| Stanley | May 4 | October 1 | 150 |
| Storm Lake | April 25 | October 13 | 170 |
| Swea City 5N | May 4 | October 1 | 150 |
| Tipton | April 21 | October 15 | 175 |
| Toledo 3N | April 30 | October 9 | 162 |
| Tripoli | April 29 | October 9 | 162 |
| Vinton | May 3 | October 3 | 151 |
| Washington | April 28 | October 11 | 165 |
| Waterloo Muni Airport | April 27 | October 10 | 165 |
| Waukon | May 2 | October 11 | 161 |
| Webster City | May 3 | October 2 | 150 |
| Williamsburg 1E | April 28 | October 9 | 164 |
| Winterset 1S | April 30 | October 3 | 157 |
Sources
- U.S. Annual/Seasonal Climate Normals, 1991 to 2020 (freeze probability dates by station), NOAA National Centers for Environmental Information, checked 1 November 2026
- Annual/Seasonal Normals 1991 to 2020 documentation, NOAA National Centers for Environmental Information, checked 1 November 2026
- 2024 Gazetteer Files, ZIP Code Tabulation Areas, US Census Bureau, checked 1 November 2026