Frost dates in Wisconsin
Across 204 NOAA stations in Wisconsin, the average last spring frost ranges from April 19 at Kenosha to June 3 at North Pelican.
| Afton - Janesville Wwtp | April 26 | October 15 | 170 |
| Alma Dam 4 | April 28 | October 14 | 168 |
| Amery | May 5 | October 4 | 151 |
| Antigo | May 14 | September 30 | 139 |
| Appleton | May 4 | October 6 | 154 |
| Arlington | May 4 | October 6 | 154 |
| Ashland 3S | May 20 | October 2 | 133 |
| Ashland Kennedy Mem Airport | May 23 | September 29 | 125 |
| Augusta Rs | May 7 | October 1 | 146 |
| Baldwin | May 6 | October 2 | 148 |
| Baraboo | May 5 | October 5 | 152 |
| Bayfield 6 N | May 20 | October 8 | 141 |
| Bayfield Fish Hatchery | May 23 | October 2 | 131 |
| Beaver Dam Wwtp | May 2 | October 9 | 157 |
| Belgium Wwtp | May 5 | October 12 | 159 |
| Beloit | May 1 | October 12 | 162 |
| Berlin Wwtp | May 1 | October 8 | 158 |
| Big Falls Hydro | May 7 | October 3 | 147 |
| Blair | May 9 | October 1 | 143 |
| Bloomer | May 5 | October 3 | 151 |
| Boscobel Airport | May 3 | October 7 | 155 |
| Brillion | May 6 | October 6 | 151 |
| Brodhead Wwtp | April 29 | October 12 | 165 |
| Brookfield Wwtp | April 30 | October 14 | 164 |
| Brule Rs | May 24 | September 26 | 124 |
| Burlington | May 5 | October 9 | 156 |
| Butternut 3Sw | May 22 | September 24 | 126 |
| Cashton | April 27 | October 14 | 170 |
| Cashton 3Nnw | May 6 | October 3 | 150 |
| Charmany Farm | April 28 | October 15 | 169 |
| Chilton | May 1 | October 14 | 162 |
| Clam Lake 4W | May 16 | September 30 | 136 |
| Clinton Wwtp | April 30 | October 10 | 161 |
| Clintonville | May 4 | October 6 | 154 |
| Crivitz High Falls | May 26 | September 22 | 118 |
| Cumberland | May 5 | October 4 | 152 |
| Dalton | May 6 | October 2 | 150 |
| Danbury | May 11 | September 30 | 138 |
| Darlington Wwtp | May 3 | October 4 | 153 |
| Delavan Wwtp | April 28 | October 14 | 168 |
| Denmark Wwtp | May 6 | October 12 | 158 |
| Dodge | May 5 | October 5 | 152 |
| Dodgeville Wwtp | May 3 | October 7 | 157 |
| Drummond | May 20 | October 1 | 132 |
| Durand | May 1 | October 10 | 162 |
| Eagle Rvr | May 25 | September 24 | 121 |
| Eau Claire 3Sw | April 24 | October 14 | 170 |
| Eau Claire Rgnl Airport | May 8 | October 4 | 149 |
| Ellsworth 1E | May 13 | September 29 | 139 |
| Ephraim 1Ne-Wwtp | May 14 | October 18 | 155 |
| Florence | May 24 | September 25 | 121 |
| Fond Du Lac 2 Sw | April 27 | October 19 | 174 |
| Fond Du Lac Co Airport | May 1 | October 10 | 160 |
| Fond Du Lac Wwtp | May 1 | October 12 | 162 |
| Forestville-4E | May 6 | October 17 | 163 |
| Foxboro | June 1 | September 22 | 113 |
| Friendship | May 9 | October 3 | 147 |
| Ft Atkinson | April 28 | October 13 | 166 |
| Gays Mills | May 3 | October 7 | 156 |
| Genoa Dam 8 | April 22 | October 17 | 178 |
| Germantown | May 6 | October 8 | 154 |
| Goodman Sanitary Dist | May 24 | September 30 | 128 |
| Gordon | May 22 | September 26 | 126 |
| Grafton Wwtp | April 23 | October 24 | 182 |
| Grantsburg | May 11 | October 1 | 141 |
| Green Bay | April 30 | October 9 | 161 |
| Green Bay Botanical | May 7 | October 9 | 154 |
| Green Bay Wfo | May 1 | October 11 | 160 |
| Hales Corners/Whitnall Park/Bo | May 3 | October 14 | 162 |
| Hancock Exp Farm | May 10 | October 3 | 146 |
| Hartford Wwtp | May 8 | October 3 | 148 |
| Hayward Muni Airport | May 23 | September 22 | 122 |
| Hayward Rs | May 22 | September 23 | 124 |
| Hillsboro | May 5 | October 4 | 153 |
| Hillsboro 2Sw | May 12 | September 29 | 138 |
| Hingham Wwtp | May 3 | October 16 | 165 |
| Holcombe | May 5 | October 2 | 149 |
| Horicon Wwtp | May 1 | October 10 | 158 |
| Hurley | May 24 | September 28 | 128 |
| Hustisford Wwtp | April 28 | October 10 | 164 |
| Jackson | April 30 | October 15 | 167 |
| Jefferson Wwtp | April 25 | October 18 | 173 |
| Jim Falls 3Nw | May 1 | October 8 | 158 |
| Jump Rvr 3E | May 20 | September 23 | 125 |
| Kenosha | April 19 | October 26 | 189 |
| Kenosha Rgnl Airport | April 28 | October 19 | 174 |
| Kewaunee | May 1 | October 18 | 168 |
| La Crosse Muni Airport | April 23 | October 17 | 177 |
| La Crosse Wfo | April 27 | October 13 | 167 |
| Ladysmith 3W | May 27 | September 22 | 117 |
| Lake Geneva Wwtp | April 25 | October 21 | 179 |
| Lake Mills Wwtp | April 29 | October 14 | 167 |
| Lakewood 3 Ne | May 22 | September 28 | 129 |
| Lancaster 4 Wsw | April 27 | October 11 | 166 |
| Laona 6 Sw | May 19 | September 29 | 131 |
| Lodi | May 1 | October 10 | 162 |
| Lone Rock Tri Co Airport | April 30 | October 9 | 161 |
| Luck | May 6 | October 4 | 149 |
| Lynxville Dam 9 | April 24 | October 17 | 175 |
| Madeline Island | May 20 | October 9 | 140 |
| Madison Dane Rgnl Airport | May 1 | October 10 | 160 |
| Manitowoc | April 30 | October 20 | 171 |
| Marinette | May 4 | October 11 | 160 |
| Markesan | May 8 | October 2 | 144 |
| Marshfield Exp Farm | May 5 | October 5 | 150 |
| Marshfield Muni Airport | May 5 | October 5 | 152 |
| Mather 3 Nw | May 6 | October 3 | 148 |
| Mauston 1 Se | May 2 | October 7 | 158 |
| Mazomanie Wwtp | May 7 | October 1 | 148 |
| Medford | May 11 | October 1 | 141 |
| Mellen 4 Ne | May 26 | September 27 | 125 |
| Menomonie | May 9 | October 1 | 143 |
| Merrill | May 11 | September 30 | 139 |
| Milwaukee Mitchell Airport | April 19 | October 29 | 192 |
| Minocqua | May 23 | September 27 | 127 |
| Minong 5 Wsw | May 10 | October 4 | 144 |
| Mondovi | May 10 | October 2 | 144 |
| Monroe Wwtp | April 27 | October 14 | 170 |
| Montello | May 3 | October 5 | 153 |
| Mt Mary College | April 26 | October 18 | 173 |
| Necedah | May 17 | September 25 | 131 |
| Necedah 5 Wnw | May 1 | October 3 | 157 |
| Neillsville 3Ese | May 10 | October 1 | 144 |
| New London | May 4 | October 6 | 153 |
| North Pelican | June 3 | September 18 | 106 |
| Oconomowoc Wwtp | April 30 | October 12 | 164 |
| Oconto 4 W | May 9 | October 6 | 150 |
| Oshkosh | April 24 | October 20 | 178 |
| Oshkosh Wittman Airport | April 30 | October 13 | 165 |
| Owen 1E | May 13 | September 26 | 136 |
| Paddock Lake | April 30 | October 15 | 167 |
| Park Falls Dnr Hq | May 15 | September 28 | 134 |
| Pattison Ranger Staion | May 18 | October 3 | 135 |
| Pell Lake | April 30 | October 13 | 164 |
| Peshtigo | May 11 | October 5 | 145 |
| Platteville | April 30 | October 13 | 166 |
| Plymouth Wwtp | May 3 | October 10 | 159 |
| Port Washington | April 27 | October 22 | 176 |
| Port Wing | May 31 | October 2 | 123 |
| Portage Wwtp | April 28 | October 10 | 164 |
| Prairie Du Chien | April 28 | October 12 | 166 |
| Prentice #2 | May 23 | September 23 | 124 |
| Racine | April 20 | October 24 | 184 |
| Racine Batten Airport | April 24 | October 24 | 180 |
| Reedsburg | May 2 | October 7 | 156 |
| Rest Lake | May 25 | September 21 | 117 |
| Rhinelander | May 22 | September 24 | 125 |
| Rhinelander 4Ne | May 23 | September 23 | 124 |
| Rhinelander Oneida Airport | May 26 | September 23 | 120 |
| Rice Lake | May 8 | October 2 | 145 |
| Rice Rsvr Tomahawk-2 | May 10 | October 4 | 146 |
| Richfield 3 Ssw | April 30 | October 16 | 167 |
| Richland Ctr | May 5 | October 6 | 154 |
| Ridgeland 1Nne | May 10 | September 29 | 140 |
| Ripon 5 Ne | May 1 | October 11 | 163 |
| River Falls | May 11 | October 1 | 143 |
| Rochester Wwtp | May 5 | October 10 | 156 |
| Rock Springs 3 Sw | April 24 | October 20 | 178 |
| Rosholt 9 Nne | May 6 | October 5 | 150 |
| Sauk City Wwtp | May 4 | October 6 | 155 |
| Saukville Wwtp | May 5 | October 11 | 158 |
| Saxon 1Wsw | May 23 | October 1 | 132 |
| Shawano 2Ssw | May 9 | October 2 | 144 |
| Sheboygan | April 25 | October 23 | 179 |
| Sheboygan Co Mem Airport | May 5 | October 8 | 154 |
| Sheboygan Wwtp | May 2 | October 21 | 169 |
| Slinger Wwtp | May 5 | October 5 | 152 |
| Solon Springs | May 12 | October 2 | 142 |
| South Milwaukee Wwtp | April 22 | October 26 | 184 |
| Sparta | May 9 | October 1 | 144 |
| Spooner Ag Res Stn | May 14 | September 28 | 135 |
| St Croix Falls | May 4 | October 8 | 156 |
| St Germain | May 19 | October 3 | 136 |
| Stanley Wwtp | May 7 | October 3 | 147 |
| Steuben 4 Se | April 22 | October 20 | 179 |
| Stevens Pt | May 4 | October 7 | 155 |
| Stockbridge-Munsee Rsvn | May 13 | September 30 | 141 |
| Stoughton | April 30 | October 11 | 163 |
| Sturgeon Bay Exp Farm | May 8 | October 13 | 157 |
| Sullivan 3Se | May 3 | October 9 | 157 |
| Superior | May 6 | October 9 | 154 |
| Suring | May 14 | October 1 | 139 |
| Town Of Westford | May 1 | October 11 | 163 |
| Trempealeau Dam 6 | April 29 | October 11 | 165 |
| Two Rivers | April 27 | October 21 | 175 |
| Union Grove | May 5 | October 8 | 156 |
| Uw Arboretum - Madison | May 1 | October 9 | 161 |
| Viroqua | May 7 | October 2 | 148 |
| W Bend Public Works | May 1 | October 12 | 161 |
| Washington Is | May 15 | October 14 | 152 |
| Waterloo Wwtp | April 30 | October 9 | 163 |
| Watertown Wwtp | April 28 | October 12 | 167 |
| Waukesha Wwtp | May 1 | October 13 | 162 |
| Waupaca | May 8 | October 6 | 151 |
| Wausau Dwtn Airport | May 6 | October 4 | 150 |
| West Allis | April 26 | October 22 | 177 |
| West Bend | May 4 | October 11 | 157 |
| Weyerhaeuser 1N | May 9 | September 29 | 140 |
| Whitewater | May 2 | October 9 | 157 |
| Willow Rsvr | May 13 | October 3 | 141 |
| Winter | May 19 | September 27 | 129 |
| Wisconsin Dells | May 8 | October 3 | 146 |
| Wisconsin Rapids | May 9 | September 30 | 142 |
| Wisconsin Rapids Alexander Fld | May 8 | October 1 | 145 |
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