Wisconsin Frost Dates
The median last spring freeze and first fall freeze (32°F) at 204 NOAA stations in Wisconsin, 1991-2020, with the growing season between them.
Every station
A median date has an even chance of a later freeze in spring or an earlier one in fall. Each town page gives the dates at 36, 32 and 28°F and every probability from 10 to 90 percent.
| Station | Elevation | Last freeze | First freeze | Season, days | Town page |
|---|---|---|---|---|---|
| Afton - Janesville Wwtp | 762 ft | April 26 | October 15 | 172 | Janesville |
| Alma Dam 4 | 670 ft | April 28 | October 14 | 169 | Alma |
| Amery | 1,070 ft | May 5 | October 4 | 152 | Amery |
| Antigo | 1,519 ft | May 14 | September 30 | 139 | Antigo |
| Appleton | 792 ft | May 4 | October 6 | 155 | Appleton |
| Arlington | 1,052 ft | May 4 | October 6 | 155 | Arlington |
| Ashland 3S | 826 ft | May 20 | October 2 | 135 | Ashland |
| Ashland Kennedy Mem AP | 826 ft | May 23 | September 29 | 129 | Ashland |
| Augusta RS | 960 ft | May 7 | October 1 | 147 | Augusta |
| Baldwin | 1,100 ft | May 6 | October 2 | 149 | Baldwin |
| Baraboo | 823 ft | May 5 | October 5 | 153 | Baraboo |
| Bayfield 6 N | 820 ft | May 20 | October 8 | 141 | Washburn |
| Bayfield Fish Hatchery | 615 ft | May 23 | October 2 | 132 | Washburn |
| Beaver Dam Wwtp | 861 ft | May 2 | October 9 | 160 | Beaver Dam |
| Belgium Wwtp | 731 ft | May 5 | October 12 | 160 | Belgium |
| Beloit | 788 ft | May 1 | October 12 | 164 | Beloit |
| Berlin Wwtp | 766 ft | May 1 | October 8 | 160 | Berlin |
| Big Falls Hydro | 1,205 ft | May 7 | October 3 | 149 | Ladysmith |
| Blair | 855 ft | May 9 | October 1 | 145 | Blair |
| Bloomer | 990 ft | May 5 | October 3 | 151 | Bloomer |
| Boscobel AP | 672 ft | May 3 | October 7 | 157 | Boscobel |
| Brillion | 810 ft | May 6 | October 6 | 153 | Brillion |
| Brodhead Wwtp | 780 ft | April 29 | October 12 | 166 | Brodhead |
| Brookfield Wwtp | 830 ft | April 30 | October 14 | 167 | Brookfield |
| Brule RS | 1,000 ft | May 24 | September 26 | 125 | Lake Nebagamon |
| Burlington | 751 ft | May 5 | October 9 | 157 | Burlington |
| Butternut 3SW | 1,570 ft | May 22 | September 24 | 125 | Park Falls |
| Cashton | 1,370 ft | April 27 | October 14 | 170 | Cashton |
| Cashton 3NNW | 939 ft | May 6 | October 3 | 150 | Cashton |
| Charmany Farm | 1,046 ft | April 28 | October 15 | 170 | Shorewood Hills |
| Chilton | 840 ft | May 1 | October 14 | 166 | Chilton |
| Clam Lake 4W | 1,498 ft | May 16 | September 30 | 137 | Mellen |
| Clinton Wwtp | 924 ft | April 30 | October 10 | 163 | Clinton |
| Clintonville | 802 ft | May 4 | October 6 | 155 | Clintonville |
| Crivitz High Falls | 950 ft | May 26 | September 22 | 119 | Middle Inlet |
| Cumberland | 1,240 ft | May 5 | October 4 | 152 | Cumberland |
| Dalton | 860 ft | May 6 | October 2 | 149 | Manchester |
| Danbury | 950 ft | May 11 | September 30 | 142 | Webster |
| Darlington Wwtp | 854 ft | May 3 | October 4 | 154 | Darlington |
| Delavan Wwtp | 882 ft | April 28 | October 14 | 169 | Delavan |
| Denmark Wwtp | 811 ft | May 6 | October 12 | 159 | Denmark |
| Dodge | 685 ft | May 5 | October 5 | 153 | |
| Dodgeville Wwtp | 1,118 ft | May 3 | October 7 | 157 | Dodgeville |
| Drummond | 1,340 ft | May 20 | October 1 | 134 | Iron River |
| Durand | 705 ft | May 1 | October 10 | 162 | Durand |
| Eagle Rvr | 1,623 ft | May 25 | September 24 | 122 | Eagle River |
| Eau Claire 3SW | 880 ft | April 24 | October 14 | 173 | Eau Claire |
| Eau Claire Rgnl AP | 885 ft | May 8 | October 4 | 149 | Lake Hallie |
| Ellsworth 1E | 1,030 ft | May 13 | September 29 | 139 | Ellsworth |
| Ephraim 1NE-Wwtp | 733 ft | May 14 | October 18 | 157 | Sister Bay |
| Florence | 1,300 ft | May 24 | September 25 | 124 | Florence |
| Fond Du Lac 2 Sw | 772 ft | April 27 | October 19 | 175 | Fond du Lac |
| Fond Du Lac CO AP | 809 ft | May 1 | October 10 | 162 | Fond du Lac |
| Fond Du Lac Wwtp | 750 ft | May 1 | October 12 | 164 | Fond du Lac |
| Forestville-4E | 690 ft | May 6 | October 17 | 164 | Algoma |
| Foxboro | 932 ft | June 1 | September 22 | 113 | |
| Friendship | 945 ft | May 9 | October 3 | 147 | Friendship |
| Ft Atkinson | 800 ft | April 28 | October 13 | 168 | Fort Atkinson |
| Gays Mills | 689 ft | May 3 | October 7 | 157 | Gays Mills |
| Genoa Dam 8 | 639 ft | April 22 | October 17 | 178 | Stoddard |
| Germantown | 850 ft | May 6 | October 8 | 155 | Germantown |
| Goodman Sanitary Dist | 1,448 ft | May 24 | September 30 | 129 | Laona |
| Gordon | 1,040 ft | May 22 | September 26 | 127 | Solon Springs |
| Grafton Wwtp | 741 ft | April 23 | October 24 | 184 | Grafton |
| Grantsburg | 990 ft | May 11 | October 1 | 143 | Grantsburg |
| Green Bay | 682 ft | April 30 | October 9 | 162 | Hobart |
| Green Bay Botanical | 694 ft | May 7 | October 9 | 155 | Howard |
| Green Bay WFO | 682 ft | May 1 | October 11 | 163 | Hobart |
| Hales Corners/whitnall Park/bo | 774 ft | May 3 | October 14 | 164 | Hales Corners |
| Hancock Exp Farm | 1,092 ft | May 10 | October 3 | 146 | Plainfield |
| Hartford Wwtp | 961 ft | May 8 | October 3 | 148 | Hartford |
| Hayward Muni AP | 1,204 ft | May 23 | September 22 | 122 | Hayward |
| Hayward RS | 1,200 ft | May 22 | September 23 | 124 | Hayward |
| Hillsboro | 940 ft | May 5 | October 4 | 152 | Hillsboro |
| Hillsboro 2SW | 1,043 ft | May 12 | September 29 | 140 | Hillsboro |
| Hingham Wwtp | 763 ft | May 3 | October 16 | 166 | Hingham |
| Holcombe | 1,057 ft | May 5 | October 2 | 150 | Cornell |
| Horicon Wwtp | 881 ft | May 1 | October 10 | 162 | Horicon |
| Hurley | 1,444 ft | May 24 | September 28 | 127 | Hurley |
| Hustisford Wwtp | 864 ft | April 28 | October 10 | 165 | Hustisford |
| Jackson | 903 ft | April 30 | October 15 | 168 | Jackson |
| Jefferson Wwtp | 783 ft | April 25 | October 18 | 176 | Jefferson |
| Jim Falls 3NW | 1,070 ft | May 1 | October 8 | 160 | Bloomer |
| Jump Rvr 3E | 1,265 ft | May 20 | September 23 | 126 | Ladysmith |
| Kenosha | 600 ft | April 19 | October 26 | 190 | Kenosha |
| Kenosha Rgnl AP | 743 ft | April 28 | October 19 | 174 | Pleasant Prairie |
| Kewaunee | 593 ft | May 1 | October 18 | 170 | Kewaunee |
| La Crosse Muni AP | 652 ft | April 23 | October 17 | 177 | Onalaska |
| La Crosse WFO | 1,307 ft | April 27 | October 13 | 169 | La Crosse |
| Ladysmith 3W | 1,130 ft | May 27 | September 22 | 118 | Ladysmith |
| Lake Geneva Wwtp | 846 ft | April 25 | October 21 | 179 | Lake Geneva |
| Lake Mills Wwtp | 811 ft | April 29 | October 14 | 168 | Lake Mills |
| Lakewood 3 Ne | 1,196 ft | May 22 | September 28 | 129 | Wabeno |
| Lancaster 4 Wsw | 1,040 ft | April 27 | October 11 | 167 | Lancaster |
| Laona 6 Sw | 1,695 ft | May 19 | September 29 | 133 | Laona |
| Lodi | 824 ft | May 1 | October 10 | 162 | Lodi |
| Lone Rock Tri CO AP | 717 ft | April 30 | October 9 | 162 | Lone Rock |
| Luck | 1,220 ft | May 6 | October 4 | 151 | Luck |
| Lynxville Dam 9 | 633 ft | April 24 | October 17 | 176 | Prairie du Chien |
| Madeline Island | 660 ft | May 20 | October 9 | 142 | Washburn |
| Madison Dane Rgnl AP | 866 ft | May 1 | October 10 | 162 | Maple Bluff |
| Manitowoc | 584 ft | April 30 | October 20 | 173 | Manitowoc |
| Marinette | 589 ft | May 4 | October 11 | 160 | Marinette |
| Markesan | 861 ft | May 8 | October 2 | 147 | Markesan |
| Marshfield Exp Farm | 1,237 ft | May 5 | October 5 | 153 | Hewitt |
| Marshfield Muni AP | 1,255 ft | May 5 | October 5 | 153 | Marshfield |
| Mather 3 Nw | 978 ft | May 6 | October 3 | 150 | Tomah |
| Mauston 1 Se | 865 ft | May 2 | October 7 | 158 | Mauston |
| Mazomanie Wwtp | 764 ft | May 7 | October 1 | 147 | Mazomanie |
| Medford | 1,470 ft | May 11 | October 1 | 143 | Medford |
| Mellen 4 Ne | 1,300 ft | May 26 | September 27 | 124 | Mellen |
| Menomonie | 780 ft | May 9 | October 1 | 145 | Menomonie |
| Merrill | 1,250 ft | May 11 | September 30 | 142 | Merrill |
| Milwaukee Mitchell AP | 670 ft | April 19 | October 29 | 193 | Saint Francis |
| Minocqua | 1,601 ft | May 23 | September 27 | 127 | Woodruff |
| Minong 5 Wsw | 1,075 ft | May 10 | October 4 | 147 | Minong |
| Mondovi | 830 ft | May 10 | October 2 | 145 | Mondovi |
| Monroe Wwtp | 991 ft | April 27 | October 14 | 170 | Monroe |
| Montello | 786 ft | May 3 | October 5 | 155 | Montello |
| Mt Mary College | 715 ft | April 26 | October 18 | 175 | Wauwatosa |
| Necedah | 922 ft | May 17 | September 25 | 131 | Necedah |
| Necedah 5 Wnw | 933 ft | May 1 | October 3 | 155 | Necedah |
| Neillsville 3ESE | 1,080 ft | May 10 | October 1 | 144 | Neillsville |
| New London | 800 ft | May 4 | October 6 | 155 | New London |
| North Pelican | 1,610 ft | June 3 | September 18 | 107 | Rhinelander |
| Oconomowoc Wwtp | 858 ft | April 30 | October 12 | 165 | Oconomowoc |
| Oconto 4 W | 660 ft | May 9 | October 6 | 150 | Oconto |
| Oshkosh | 750 ft | April 24 | October 20 | 179 | Oshkosh |
| Oshkosh Wittman AP | 782 ft | April 30 | October 13 | 166 | Oshkosh |
| Owen 1E | 1,238 ft | May 13 | September 26 | 136 | Owen |
| Paddock Lake | 775 ft | April 30 | October 15 | 168 | Paddock Lake |
| Park Falls Dnr Hq | 1,525 ft | May 15 | September 28 | 136 | Park Falls |
| Pattison Ranger Staion | 1,100 ft | May 18 | October 3 | 138 | Superior Village |
| Pell Lake | 840 ft | April 30 | October 13 | 166 | Pell Lake |
| Peshtigo | 600 ft | May 11 | October 5 | 147 | Peshtigo |
| Platteville | 990 ft | April 30 | October 13 | 166 | Platteville |
| Plymouth Wwtp | 828 ft | May 3 | October 10 | 160 | Plymouth |
| Port Washington | 594 ft | April 27 | October 22 | 178 | Port Washington |
| Port Wing | 651 ft | May 31 | October 2 | 124 | Iron River |
| Portage Wwtp | 785 ft | April 28 | October 10 | 165 | Portage |
| Prairie Du Chien | 658 ft | April 28 | October 12 | 167 | Prairie du Chien |
| Prentice #2 | 1,540 ft | May 23 | September 23 | 123 | Prentice |
| Racine | 595 ft | April 20 | October 24 | 187 | Racine |
| Racine Batten AP | 674 ft | April 24 | October 24 | 183 | Racine |
| Reedsburg | 926 ft | May 2 | October 7 | 158 | Reedsburg |
| Rest Lake | 1,612 ft | May 25 | September 21 | 119 | Mercer |
| Rhinelander | 1,572 ft | May 22 | September 24 | 125 | Rhinelander |
| Rhinelander 4NE | 1,586 ft | May 23 | September 23 | 123 | Rhinelander |
| Rhinelander Oneida AP | 1,599 ft | May 26 | September 23 | 120 | Rhinelander |
| Rice Lake | 1,103 ft | May 8 | October 2 | 147 | Cameron |
| Rice Rsvr Tomahawk-2 | 1,460 ft | May 10 | October 4 | 147 | Tomahawk |
| Richfield 3 Ssw | 984 ft | April 30 | October 16 | 169 | Richfield |
| Richland Ctr | 728 ft | May 5 | October 6 | 154 | Richland Center |
| Ridgeland 1NNE | 1,080 ft | May 10 | September 29 | 142 | Barron |
| Ripon 5 Ne | 930 ft | May 1 | October 11 | 163 | Ripon |
| River Falls | 940 ft | May 11 | October 1 | 143 | River Falls |
| Rochester Wwtp | 783 ft | May 5 | October 10 | 158 | Rochester |
| Rock Springs 3 Sw | 1,260 ft | April 24 | October 20 | 179 | North Freedom |
| Rosholt 9 Nne | 1,183 ft | May 6 | October 5 | 152 | Wittenberg |
| Sauk City Wwtp | 750 ft | May 4 | October 6 | 155 | Sauk City |
| Saukville Wwtp | 766 ft | May 5 | October 11 | 159 | Saukville |
| Saxon 1WSW | 1,165 ft | May 23 | October 1 | 131 | Montreal |
| Shawano 2SSW | 806 ft | May 9 | October 2 | 146 | Shawano |
| Sheboygan | 648 ft | April 25 | October 23 | 181 | Sheboygan |
| Sheboygan CO Mem AP | 746 ft | May 5 | October 8 | 156 | Sheboygan Falls |
| Sheboygan Wwtp | 603 ft | May 2 | October 21 | 172 | Sheboygan |
| Slinger Wwtp | 1,029 ft | May 5 | October 5 | 153 | Slinger |
| Solon Springs | 1,130 ft | May 12 | October 2 | 143 | Solon Springs |
| South Milwaukee Wwtp | 650 ft | April 22 | October 26 | 187 | South Milwaukee |
| Sparta | 782 ft | May 9 | October 1 | 145 | Sparta |
| Spooner Ag Res Stn | 1,100 ft | May 14 | September 28 | 137 | Spooner |
| St Croix Falls | 750 ft | May 4 | October 8 | 157 | Saint Croix Falls |
| St Germain | 1,643 ft | May 19 | October 3 | 137 | Woodruff |
| Stanley Wwtp | 1,080 ft | May 7 | October 3 | 149 | Stanley |
| Steuben 4 Se | 1,015 ft | April 22 | October 20 | 181 | Wauzeka |
| Stevens Pt | 1,079 ft | May 4 | October 7 | 156 | Stevens Point |
| Stockbridge-Munsee Rsvn | 1,050 ft | May 13 | September 30 | 140 | Gresham |
| Stoughton | 840 ft | April 30 | October 11 | 164 | Stoughton |
| Sturgeon Bay Exp Farm | 699 ft | May 8 | October 13 | 158 | Sturgeon Bay |
| Sullivan 3SE | 933 ft | May 3 | October 9 | 159 | Sullivan |
| Superior | 607 ft | May 6 | October 9 | 156 | Superior |
| Suring | 792 ft | May 14 | October 1 | 140 | Suring |
| Town Of Westford | 879 ft | May 1 | October 11 | 163 | Beaver Dam |
| Trempealeau Dam 6 | 660 ft | April 29 | October 11 | 165 | Trempealeau |
| Two Rivers | 589 ft | April 27 | October 21 | 177 | Two Rivers |
| Union Grove | 730 ft | May 5 | October 8 | 156 | Union Grove |
| Uw Arboretum - Madison | 870 ft | May 1 | October 9 | 161 | Madison |
| Viroqua | 1,255 ft | May 7 | October 2 | 148 | Viroqua |
| W Bend Public Works | 980 ft | May 1 | October 12 | 164 | West Bend |
| Washington Is | 686 ft | May 15 | October 14 | 152 | Washington |
| Waterloo Wwtp | 800 ft | April 30 | October 9 | 162 | Waterloo |
| Watertown Wwtp | 825 ft | April 28 | October 12 | 167 | Watertown |
| Waukesha Wwtp | 789 ft | May 1 | October 13 | 165 | Waukesha |
| Waupaca | 837 ft | May 8 | October 6 | 151 | Waupaca |
| Wausau Dwtn AP | 1,181 ft | May 6 | October 4 | 151 | Schofield |
| West Allis | 723 ft | April 26 | October 22 | 179 | West Allis |
| West Bend | 940 ft | May 4 | October 11 | 160 | Newburg |
| Weyerhaeuser 1N | 1,195 ft | May 9 | September 29 | 143 | Bruce |
| Whitewater | 875 ft | May 2 | October 9 | 160 | Whitewater |
| Willow Rsvr | 1,532 ft | May 13 | October 3 | 143 | Woodruff |
| Winter | 1,355 ft | May 19 | September 27 | 131 | Chief Lake |
| Wisconsin Dells | 835 ft | May 8 | October 3 | 148 | Wisconsin Dells |
| Wisconsin Rapids | 1,033 ft | May 9 | September 30 | 144 | Wisconsin Rapids |
| Wisconsin Rapids Alexander Fld | 1,019 ft | May 8 | October 1 | 146 | Port Edwards |
Sources
NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal freeze probabilities. Public domain.