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Wisconsin frost dates

Across 204 NOAA climate stations in Wisconsin, the median last spring frost (32°F) ranges from Apr 19 at Kenosha to Jun 3 at North Pelican; the typical station sees its last frost around May 5 and its first fall frost around Oct 6.

“Median” dates have a 50% chance of a later spring frost or an earlier fall frost. “10% risk” dates are the safer choice for tender plants: only 1 year in 10 has frost beyond them. Source: NOAA NCEI 1991–2020 Climate Normals. Elevation matters: within a state, frost dates can differ by a month or more between valleys and hills.

StationElevationLast frost (median)Last frost (10% risk)First frost (median)First frost (10% risk)Growing season
Afton - Janesville Wwtp762 ftApr 26May 11Oct 15Oct 1170 days
Alma Dam 4670 ftApr 28May 9Oct 14Sep 29168 days
Amery1,070 ftMay 5May 21Oct 4Sep 21151 days
Antigo1,519 ftMay 14May 28Sep 30Sep 14139 days
Appleton792 ftMay 4May 20Oct 6Sep 23154 days
Arlington1,052 ftMay 4May 18Oct 6Sep 23154 days
Ashland 3S826 ftMay 20Jun 3Oct 2Sep 19133 days
Ashland Kennedy Mem AP826 ftMay 23Jun 6Sep 29Sep 14125 days
Augusta Rs960 ftMay 7May 20Oct 1Sep 17146 days
Baldwin1,100 ftMay 6May 21Oct 2Sep 18148 days
Baraboo823 ftMay 5May 21Oct 5Sep 22152 days
Bayfield 6 N820 ftMay 20Jun 5Oct 8Sep 21141 days
Bayfield Fish Hatchery615 ftMay 23Jun 5Oct 2Sep 17131 days
Beaver Dam Wwtp861 ftMay 2May 16Oct 9Sep 25157 days
Belgium Wwtp731 ftMay 5May 22Oct 12Sep 27159 days
Beloit788 ftMay 1May 16Oct 12Sep 28162 days
Berlin Wwtp766 ftMay 1May 16Oct 8Sep 24158 days
Big Falls Hydro1,205 ftMay 7May 22Oct 3Sep 18147 days
Blair855 ftMay 9May 23Oct 1Sep 18143 days
Bloomer990 ftMay 5May 19Oct 3Sep 20151 days
Boscobel AP672 ftMay 3May 18Oct 7Sep 25155 days
Brillion810 ftMay 6May 21Oct 6Sep 23151 days
Brodhead Wwtp780 ftApr 29May 14Oct 12Sep 28165 days
Brookfield Wwtp830 ftApr 30May 15Oct 14Sep 28164 days
Brule Rs1,000 ftMay 24Jun 6Sep 26Sep 9124 days
Burlington751 ftMay 5May 23Oct 9Sep 24156 days
Butternut 3SW1,570 ftMay 22Jun 4Sep 24Sep 10126 days
Cashton1,370 ftApr 27May 11Oct 14Oct 1170 days
Cashton 3NNW939 ftMay 6May 20Oct 3Sep 20150 days
Charmany Farm1,046 ftApr 28May 11Oct 15Sep 29169 days
Chilton840 ftMay 1May 17Oct 14Sep 29162 days
Clam Lake 4W1,498 ftMay 16May 27Sep 30Sep 17136 days
Clinton Wwtp924 ftApr 30May 17Oct 10Sep 26161 days
Clintonville802 ftMay 4May 19Oct 6Sep 21154 days
Crivitz High Falls950 ftMay 26Jun 11Sep 22Sep 6118 days
Cumberland1,240 ftMay 5May 18Oct 4Sep 23152 days
Dalton860 ftMay 6May 22Oct 2Sep 20150 days
Danbury950 ftMay 11May 28Sep 30Sep 15138 days
Darlington Wwtp854 ftMay 3May 19Oct 4Sep 20153 days
Delavan Wwtp882 ftApr 28May 14Oct 14Sep 28168 days
Denmark Wwtp811 ftMay 6May 20Oct 12Sep 30158 days
Dodge685 ftMay 5May 19Oct 5Sep 21152 days
Dodgeville Wwtp1,118 ftMay 3May 17Oct 7Sep 25157 days
Drummond1,340 ftMay 20Jun 2Oct 1Sep 19132 days
Durand705 ftMay 1May 15Oct 10Sep 26162 days
Eagle Rvr1,623 ftMay 25Jun 6Sep 24Sep 8121 days
Eau Claire 3SW880 ftApr 24May 7Oct 14Sep 26170 days
Eau Claire Rgnl AP885 ftMay 8May 21Oct 4Sep 20149 days
Ellsworth 1E1,030 ftMay 13May 27Sep 29Sep 15139 days
Ephraim 1NE-Wwtp733 ftMay 14May 28Oct 18Oct 1155 days
Florence1,300 ftMay 24Jun 8Sep 25Sep 7121 days
Fond Du Lac 2 Sw772 ftApr 27May 11Oct 19Oct 2174 days
Fond Du Lac Co AP809 ftMay 1May 17Oct 10Sep 27160 days
Fond Du Lac Wwtp750 ftMay 1May 17Oct 12Sep 28162 days
Forestville-4E690 ftMay 6May 20Oct 17Oct 1163 days
Foxboro932 ftJun 1Jun 14Sep 22Sep 8113 days
Friendship945 ftMay 9May 23Oct 3Sep 19147 days
Ft Atkinson800 ftApr 28May 17Oct 13Sep 29166 days
Gays Mills689 ftMay 3May 18Oct 7Sep 25156 days
Genoa Dam 8639 ftApr 22May 5Oct 17Oct 4178 days
Germantown850 ftMay 6May 25Oct 8Sep 26154 days
Goodman Sanitary Dist1,448 ftMay 24Jun 7Sep 30Sep 16128 days
Gordon1,040 ftMay 22Jun 4Sep 26Sep 11126 days
Grafton Wwtp741 ftApr 23May 9Oct 24Oct 8182 days
Grantsburg990 ftMay 11May 28Oct 1Sep 16141 days
Green Bay682 ftApr 30May 16Oct 9Sep 24161 days
Green Bay Botanical694 ftMay 7May 22Oct 9Sep 23154 days
Green Bay Wfo682 ftMay 1May 16Oct 11Sep 26160 days
Hales Corners/Whitnall Park/Bo774 ftMay 3May 19Oct 14Sep 30162 days
Hancock Exp Farm1,092 ftMay 10May 24Oct 3Sep 20146 days
Hartford Wwtp961 ftMay 8May 24Oct 3Sep 20148 days
Hayward Muni AP1,204 ftMay 23Jun 6Sep 22Sep 5122 days
Hayward Rs1,200 ftMay 22Jun 6Sep 23Sep 3124 days
Hillsboro940 ftMay 5May 18Oct 4Sep 23153 days
Hillsboro 2SW1,043 ftMay 12May 26Sep 29Sep 17138 days
Hingham Wwtp763 ftMay 3May 18Oct 16Oct 2165 days
Holcombe1,057 ftMay 5May 21Oct 2Sep 19149 days
Horicon Wwtp881 ftMay 1May 19Oct 10Sep 27158 days
Hurley1,444 ftMay 24Jun 7Sep 28Sep 13128 days
Hustisford Wwtp864 ftApr 28May 13Oct 10Sep 26164 days
Jackson903 ftApr 30May 15Oct 15Oct 1167 days
Jefferson Wwtp783 ftApr 25May 9Oct 18Oct 2173 days
Jim Falls 3NW1,070 ftMay 1May 16Oct 8Sep 22158 days
Jump Rvr 3E1,265 ftMay 20Jun 4Sep 23Sep 6125 days
Kenosha600 ftApr 19May 3Oct 26Oct 11189 days
Kenosha Rgnl AP743 ftApr 28May 13Oct 19Oct 1174 days
Kewaunee593 ftMay 1May 17Oct 18Oct 2168 days
La Crosse Muni AP652 ftApr 23May 6Oct 17Oct 3177 days
La Crosse Wfo1,307 ftApr 27May 12Oct 13Sep 28167 days
Ladysmith 3W1,130 ftMay 27Jun 8Sep 22Sep 6117 days
Lake Geneva Wwtp846 ftApr 25May 10Oct 21Oct 5179 days
Lake Mills Wwtp811 ftApr 29May 13Oct 14Sep 29167 days
Lakewood 3 Ne1,196 ftMay 22Jun 3Sep 28Sep 12129 days
Lancaster 4 Wsw1,040 ftApr 27May 11Oct 11Sep 27166 days
Laona 6 Sw1,695 ftMay 19Jun 2Sep 29Sep 15131 days
Lodi824 ftMay 1May 15Oct 10Sep 27162 days
Lone Rock Tri Co AP717 ftApr 30May 14Oct 9Sep 25161 days
Luck1,220 ftMay 6May 20Oct 4Sep 19149 days
Lynxville Dam 9633 ftApr 24May 8Oct 17Oct 4175 days
Madeline Island660 ftMay 20Jun 3Oct 9Sep 25140 days
Madison Dane Rgnl AP866 ftMay 1May 16Oct 10Sep 26160 days
Manitowoc584 ftApr 30May 15Oct 20Oct 3171 days
Marinette589 ftMay 4May 20Oct 11Sep 29160 days
Markesan861 ftMay 8May 23Oct 2Sep 19144 days
Marshfield Exp Farm1,237 ftMay 5May 20Oct 5Sep 22150 days
Marshfield Muni AP1,255 ftMay 5May 20Oct 5Sep 21152 days
Mather 3 Nw978 ftMay 6May 20Oct 3Sep 19148 days
Mauston 1 Se865 ftMay 2May 15Oct 7Sep 26158 days
Mazomanie Wwtp764 ftMay 7May 22Oct 1Sep 18148 days
Medford1,470 ftMay 11May 26Oct 1Sep 17141 days
Mellen 4 Ne1,300 ftMay 26Jun 9Sep 27Sep 12125 days
Menomonie780 ftMay 9May 24Oct 1Sep 19143 days
Merrill1,250 ftMay 11May 27Sep 30Sep 17139 days
Milwaukee Mitchell AP670 ftApr 19May 2Oct 29Oct 15192 days
Minocqua1,601 ftMay 23Jun 6Sep 27Sep 9127 days
Minong 5 Wsw1,075 ftMay 10May 26Oct 4Sep 21144 days
Mondovi830 ftMay 10May 25Oct 2Sep 19144 days
Monroe Wwtp991 ftApr 27May 12Oct 14Sep 29170 days
Montello786 ftMay 3May 18Oct 5Sep 22153 days
Mt Mary College715 ftApr 26May 12Oct 18Oct 2173 days
Necedah922 ftMay 17Jun 1Sep 25Sep 12131 days
Necedah 5 Wnw933 ftMay 1May 14Oct 3Sep 20157 days
Neillsville 3ESE1,080 ftMay 10May 25Oct 1Sep 18144 days
New London800 ftMay 4May 19Oct 6Sep 22153 days
North Pelican1,610 ftJun 3Jun 27Sep 18Sep 1106 days
Oconomowoc Wwtp858 ftApr 30May 17Oct 12Sep 29164 days
Oconto 4 W660 ftMay 9May 23Oct 6Sep 22150 days
Oshkosh750 ftApr 24May 8Oct 20Oct 4178 days
Oshkosh Wittman AP782 ftApr 30May 13Oct 13Sep 29165 days
Owen 1E1,238 ftMay 13May 29Sep 26Sep 12136 days
Paddock Lake775 ftApr 30May 16Oct 15Sep 30167 days
Park Falls Dnr Hq1,525 ftMay 15May 30Sep 28Sep 16134 days
Pattison Ranger Staion1,100 ftMay 18Jun 3Oct 3Sep 20135 days
Pell Lake840 ftApr 30May 16Oct 13Sep 28164 days
Peshtigo600 ftMay 11May 26Oct 5Sep 21145 days
Platteville990 ftApr 30May 13Oct 13Sep 29166 days
Plymouth Wwtp828 ftMay 3May 20Oct 10Sep 28159 days
Port Washington594 ftApr 27May 14Oct 22Oct 6176 days
Port Wing651 ftMay 31Jun 13Oct 2Sep 17123 days
Portage Wwtp785 ftApr 28May 12Oct 10Sep 26164 days
Prairie Du Chien658 ftApr 28May 11Oct 12Sep 27166 days
Prentice #21,540 ftMay 23Jun 6Sep 23Sep 5124 days
Racine595 ftApr 20May 6Oct 24Oct 8184 days
Racine Batten AP674 ftApr 24May 10Oct 24Oct 10180 days
Reedsburg926 ftMay 2May 16Oct 7Sep 23156 days
Rest Lake1,612 ftMay 25Jun 9Sep 21Sep 3117 days
Rhinelander1,572 ftMay 22Jun 4Sep 24Sep 9125 days
Rhinelander 4NE1,586 ftMay 23Jun 5Sep 23Sep 7124 days
Rhinelander Oneida AP1,599 ftMay 26Jun 8Sep 23Sep 5120 days
Rice Lake1,103 ftMay 8May 23Oct 2Sep 19145 days
Rice Rsvr Tomahawk-21,460 ftMay 10May 27Oct 4Sep 21146 days
Richfield 3 Ssw984 ftApr 30May 16Oct 16Oct 1167 days
Richland Ctr728 ftMay 5May 19Oct 6Sep 24154 days
Ridgeland 1NNE1,080 ftMay 10May 26Sep 29Sep 13140 days
Ripon 5 Ne930 ftMay 1May 14Oct 11Sep 26163 days
River Falls940 ftMay 11May 26Oct 1Sep 19143 days
Rochester Wwtp783 ftMay 5May 23Oct 10Sep 26156 days
Rock Springs 3 Sw1,260 ftApr 24May 7Oct 20Oct 1178 days
Rosholt 9 Nne1,183 ftMay 6May 21Oct 5Sep 22150 days
Sauk City Wwtp750 ftMay 4May 18Oct 6Sep 23155 days
Saukville Wwtp766 ftMay 5May 19Oct 11Sep 29158 days
Saxon 1WSW1,165 ftMay 23Jun 5Oct 1Sep 18132 days
Shawano 2SSW806 ftMay 9May 24Oct 2Sep 18144 days
Sheboygan648 ftApr 25May 11Oct 23Oct 9179 days
Sheboygan Co Mem AP746 ftMay 5May 21Oct 8Sep 26154 days
Sheboygan Wwtp603 ftMay 2May 19Oct 21Oct 3169 days
Slinger Wwtp1,029 ftMay 5May 20Oct 5Sep 22152 days
Solon Springs1,130 ftMay 12May 27Oct 2Sep 17142 days
South Milwaukee Wwtp650 ftApr 22May 8Oct 26Oct 10184 days
Sparta782 ftMay 9May 22Oct 1Sep 18144 days
Spooner Ag Res Stn1,100 ftMay 14May 29Sep 28Sep 14135 days
St Croix Falls750 ftMay 4May 18Oct 8Sep 24156 days
St Germain1,643 ftMay 19May 31Oct 3Sep 18136 days
Stanley Wwtp1,080 ftMay 7May 21Oct 3Sep 20147 days
Steuben 4 Se1,015 ftApr 22May 8Oct 20Oct 5179 days
Stevens Pt1,079 ftMay 4May 20Oct 7Sep 24155 days
Stockbridge-Munsee Rsvn1,050 ftMay 13May 26Sep 30Sep 17141 days
Stoughton840 ftApr 30May 15Oct 11Sep 28163 days
Sturgeon Bay Exp Farm699 ftMay 8May 21Oct 13Sep 28157 days
Sullivan 3SE933 ftMay 3May 21Oct 9Sep 25157 days
Superior607 ftMay 6May 25Oct 9Sep 24154 days
Suring792 ftMay 14May 29Oct 1Sep 19139 days
Town Of Westford879 ftMay 1May 16Oct 11Sep 27163 days
Trempealeau Dam 6660 ftApr 29May 13Oct 11Sep 26165 days
Two Rivers589 ftApr 27May 10Oct 21Oct 4175 days
Union Grove730 ftMay 5May 20Oct 8Sep 27156 days
Uw Arboretum - Madison870 ftMay 1May 17Oct 9Sep 26161 days
Viroqua1,255 ftMay 7May 21Oct 2Sep 18148 days
W Bend Public Works980 ftMay 1May 18Oct 12Sep 28161 days
Washington Is686 ftMay 15May 31Oct 14Sep 28152 days
Waterloo Wwtp800 ftApr 30May 15Oct 9Sep 27163 days
Watertown Wwtp825 ftApr 28May 13Oct 12Sep 28167 days
Waukesha Wwtp789 ftMay 1May 18Oct 13Sep 29162 days
Waupaca837 ftMay 8May 21Oct 6Sep 23151 days
Wausau Dwtn AP1,181 ftMay 6May 21Oct 4Sep 21150 days
West Allis723 ftApr 26May 12Oct 22Oct 7177 days
West Bend940 ftMay 4May 21Oct 11Sep 26157 days
Weyerhaeuser 1N1,195 ftMay 9May 27Sep 29Sep 14140 days
Whitewater875 ftMay 2May 20Oct 9Sep 25157 days
Willow Rsvr1,532 ftMay 13May 27Oct 3Sep 16141 days
Winter1,355 ftMay 19Jun 3Sep 27Sep 8129 days
Wisconsin Dells835 ftMay 8May 22Oct 3Sep 21146 days
Wisconsin Rapids1,033 ftMay 9May 24Sep 30Sep 17142 days
Wisconsin Rapids Alexander Fld1,019 ftMay 8May 22Oct 1Sep 19145 days
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