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Wisconsin frost dates by weather station

Wisconsin has 205 NOAA weather stations with 1991–2020 freeze statistics. Median last spring frost dates run from Apr 19 at Kenosha to Jun 3 at North Pelican.

205Stations
Apr 19Earliest last frostKenosha
Jun 3Latest last frostNorth Pelican
192 daysLongest growing seasonMilwaukee Mitchell Airport

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Wisconsin stations: median (50%) frost dates at 32°F
Station	Last spring frost	First fall frost	Growing season	Elevation
Afton - Janesville Wastewater Plant	Apr 26	Oct 15	170 days	762 ft
Alma Dam 4	Apr 28	Oct 14	168 days	670 ft
Amery	May 5	Oct 4	151 days	1,070 ft
Antigo	May 14	Sep 30	139 days	1,519 ft
Appleton	May 4	Oct 6	154 days	792 ft
Arlington	May 4	Oct 6	154 days	1,052 ft
Ashland 3s	May 20	Oct 2	133 days	826 ft
Ashland Kennedy Mem Airport	May 23	Sep 29	125 days	826 ft
Augusta Ranger Station	May 7	Oct 1	146 days	960 ft
Baldwin	May 6	Oct 2	148 days	1,100 ft
Baraboo	May 5	Oct 5	152 days	823 ft
Bayfield 6 N	May 20	Oct 8	141 days	820 ft
Bayfield Fish Hatchery	May 23	Oct 2	131 days	615 ft
Beaver Dam Wastewater Plant	May 2	Oct 9	157 days	861 ft
Belgium Wastewater Plant	May 5	Oct 12	159 days	731 ft
Beloit	May 1	Oct 12	162 days	788 ft
Berlin Wastewater Plant	May 1	Oct 8	158 days	766 ft
Big Falls Hydro	May 7	Oct 3	147 days	1,205 ft
Blair	May 9	Oct 1	143 days	855 ft
Bloomer	May 5	Oct 3	151 days	990 ft
Boscobel Airport	May 3	Oct 7	155 days	672 ft
Brillion	May 6	Oct 6	151 days	810 ft
Brodhead Wastewater Plant	Apr 29	Oct 12	165 days	780 ft
Brookfield Wastewater Plant	Apr 30	Oct 14	164 days	830 ft
Brule Ranger Station	May 24	Sep 26	124 days	1,000 ft
Burlington	May 5	Oct 9	156 days	751 ft
Butternut 3sw	May 22	Sep 24	126 days	1,570 ft
Cashton	Apr 27	Oct 14	170 days	1,370 ft
Cashton 3nnw	May 6	Oct 3	150 days	939 ft
Charmany Farm	Apr 28	Oct 15	169 days	1,046 ft
Chilton	May 1	Oct 14	162 days	840 ft
Clam Lake 4w	May 16	Sep 30	136 days	1,498 ft
Clinton Wastewater Plant	Apr 30	Oct 10	161 days	924 ft
Clintonville	May 4	Oct 6	154 days	802 ft
Couderay 7 W	any month	any month	100 days	1,300 ft
Crivitz High Falls	May 26	Sep 22	118 days	950 ft
Cumberland	May 5	Oct 4	152 days	1,240 ft
Dalton	May 6	Oct 2	150 days	860 ft
Danbury	May 11	Sep 30	138 days	950 ft
Darlington Wastewater Plant	May 3	Oct 4	153 days	854 ft
Delavan Wastewater Plant	Apr 28	Oct 14	168 days	882 ft
Denmark Wastewater Plant	May 6	Oct 12	158 days	811 ft
Dodge	May 5	Oct 5	152 days	685 ft
Dodgeville Wastewater Plant	May 3	Oct 7	157 days	1,118 ft
Drummond	May 20	Oct 1	132 days	1,340 ft
Durand	May 1	Oct 10	162 days	705 ft
Eagle River	May 25	Sep 24	121 days	1,623 ft
Eau Claire 3sw	Apr 24	Oct 14	170 days	880 ft
Eau Claire Regional Airport	May 8	Oct 4	149 days	885 ft
Ellsworth 1e	May 13	Sep 29	139 days	1,030 ft
Ephraim 1ne-Wwtp	May 14	Oct 18	155 days	733 ft
Florence	May 24	Sep 25	121 days	1,300 ft
Fond Du Lac 2 SW	Apr 27	Oct 19	174 days	772 ft
Fond Du Lac Co Airport	May 1	Oct 10	160 days	809 ft
Fond Du Lac Wastewater Plant	May 1	Oct 12	162 days	750 ft
Forestville-4e	May 6	Oct 17	163 days	690 ft
Fort Atkinson	Apr 28	Oct 13	166 days	800 ft
Foxboro	Jun 1	Sep 22	113 days	932 ft
Friendship	May 9	Oct 3	147 days	945 ft
Gays Mills	May 3	Oct 7	156 days	689 ft
Genoa Dam 8	Apr 22	Oct 17	178 days	639 ft
Germantown	May 6	Oct 8	154 days	850 ft
Goodman Sanitary Dist	May 24	Sep 30	128 days	1,448 ft
Gordon	May 22	Sep 26	126 days	1,040 ft
Grafton Wastewater Plant	Apr 23	Oct 24	182 days	741 ft
Grantsburg	May 11	Oct 1	141 days	990 ft
Green Bay	Apr 30	Oct 9	161 days	682 ft
Green Bay Botanical	May 7	Oct 9	154 days	694 ft
Green Bay WFO	May 1	Oct 11	160 days	682 ft
Hales Corners/whitnall Park/bo	May 3	Oct 14	162 days	774 ft
Hancock Exp. Farm	May 10	Oct 3	146 days	1,092 ft
Hartford Wastewater Plant	May 8	Oct 3	148 days	961 ft
Hayward Muni Airport	May 23	Sep 22	122 days	1,204 ft
Hayward Ranger Station	May 22	Sep 23	124 days	1,200 ft
Hillsboro	May 5	Oct 4	153 days	940 ft
Hillsboro 2sw	May 12	Sep 29	138 days	1,043 ft
Hingham Wastewater Plant	May 3	Oct 16	165 days	763 ft
Holcombe	May 5	Oct 2	149 days	1,057 ft
Horicon Wastewater Plant	May 1	Oct 10	158 days	881 ft
Hurley	May 24	Sep 28	128 days	1,444 ft
Hustisford Wastewater Plant	Apr 28	Oct 10	164 days	864 ft
Jackson	Apr 30	Oct 15	167 days	903 ft
Jefferson Wastewater Plant	Apr 25	Oct 18	173 days	783 ft
Jim Falls 3nw	May 1	Oct 8	158 days	1,070 ft
Jump River 3e	May 20	Sep 23	125 days	1,265 ft
Kenosha	Apr 19	Oct 26	189 days	600 ft
Kenosha Regional Airport	Apr 28	Oct 19	174 days	743 ft
Kewaunee	May 1	Oct 18	168 days	593 ft
La Crosse Muni Airport	Apr 23	Oct 17	177 days	652 ft
La Crosse WFO	Apr 27	Oct 13	167 days	1,307 ft
Ladysmith 3w	May 27	Sep 22	117 days	1,130 ft
Lake Geneva Wastewater Plant	Apr 25	Oct 21	179 days	846 ft
Lake Mills Wastewater Plant	Apr 29	Oct 14	167 days	811 ft
Lakewood 3 NE	May 22	Sep 28	129 days	1,196 ft
Lancaster 4 WSW	Apr 27	Oct 11	166 days	1,040 ft
Laona 6 SW	May 19	Sep 29	131 days	1,695 ft
Lodi	May 1	Oct 10	162 days	824 ft
Lone Rock Tri Co Airport	Apr 30	Oct 9	161 days	717 ft
Luck	May 6	Oct 4	149 days	1,220 ft
Lynxville Dam 9	Apr 24	Oct 17	175 days	633 ft
Madeline Island	May 20	Oct 9	140 days	660 ft
Madison Dane Regional Airport	May 1	Oct 10	160 days	866 ft
Manitowoc	Apr 30	Oct 20	171 days	584 ft
Marinette	May 4	Oct 11	160 days	589 ft
Markesan	May 8	Oct 2	144 days	861 ft
Marshfield Exp. Farm	May 5	Oct 5	150 days	1,237 ft
Marshfield Muni Airport	May 5	Oct 5	152 days	1,255 ft
Mather 3 NW	May 6	Oct 3	148 days	978 ft
Mauston 1 SE	May 2	Oct 7	158 days	865 ft
Mazomanie Wastewater Plant	May 7	Oct 1	148 days	764 ft
Medford	May 11	Oct 1	141 days	1,470 ft
Mellen 4 NE	May 26	Sep 27	125 days	1,300 ft
Menomonie	May 9	Oct 1	143 days	780 ft
Merrill	May 11	Sep 30	139 days	1,250 ft
Milwaukee Mitchell Airport	Apr 19	Oct 29	192 days	670 ft
Minocqua	May 23	Sep 27	127 days	1,601 ft
Minong 5 WSW	May 10	Oct 4	144 days	1,075 ft
Mondovi	May 10	Oct 2	144 days	830 ft
Monroe Wastewater Plant	Apr 27	Oct 14	170 days	991 ft
Montello	May 3	Oct 5	153 days	786 ft
Mount Mary College	Apr 26	Oct 18	173 days	715 ft
Necedah	May 17	Sep 25	131 days	922 ft
Necedah 5 WNW	May 1	Oct 3	157 days	933 ft
Neillsville 3ese	May 10	Oct 1	144 days	1,080 ft
New London	May 4	Oct 6	153 days	800 ft
North Pelican	Jun 3	Sep 18	106 days	1,610 ft
Oconomowoc Wastewater Plant	Apr 30	Oct 12	164 days	858 ft
Oconto 4 W	May 9	Oct 6	150 days	660 ft
Oshkosh	Apr 24	Oct 20	178 days	750 ft
Oshkosh Wittman Airport	Apr 30	Oct 13	165 days	782 ft
Owen 1e	May 13	Sep 26	136 days	1,238 ft
Paddock Lake	Apr 30	Oct 15	167 days	775 ft
Park Falls Dnr HQ	May 15	Sep 28	134 days	1,525 ft
Pattison Ranger Staion	May 18	Oct 3	135 days	1,100 ft
Pell Lake	Apr 30	Oct 13	164 days	840 ft
Peshtigo	May 11	Oct 5	145 days	600 ft
Platteville	Apr 30	Oct 13	166 days	990 ft
Plymouth Wastewater Plant	May 3	Oct 10	159 days	828 ft
Port Washington	Apr 27	Oct 22	176 days	594 ft
Port Wing	May 31	Oct 2	123 days	651 ft
Portage Wastewater Plant	Apr 28	Oct 10	164 days	785 ft
Prairie Du Chien	Apr 28	Oct 12	166 days	658 ft
Prentice #2	May 23	Sep 23	124 days	1,540 ft
Racine	Apr 20	Oct 24	184 days	595 ft
Racine Batten Airport	Apr 24	Oct 24	180 days	674 ft
Reedsburg	May 2	Oct 7	156 days	926 ft
Rest Lake	May 25	Sep 21	117 days	1,612 ft
Rhinelander	May 22	Sep 24	125 days	1,572 ft
Rhinelander 4ne	May 23	Sep 23	124 days	1,586 ft
Rhinelander Oneida Airport	May 26	Sep 23	120 days	1,599 ft
Rice Lake	May 8	Oct 2	145 days	1,103 ft
Rice Rsvr Tomahawk-2	May 10	Oct 4	146 days	1,460 ft
Richfield 3 SSW	Apr 30	Oct 16	167 days	984 ft
Richland Center	May 5	Oct 6	154 days	728 ft
Ridgeland 1nne	May 10	Sep 29	140 days	1,080 ft
Ripon 5 NE	May 1	Oct 11	163 days	930 ft
River Falls	May 11	Oct 1	143 days	940 ft
Rochester Wastewater Plant	May 5	Oct 10	156 days	783 ft
Rock Springs 3 SW	Apr 24	Oct 20	178 days	1,260 ft
Rosholt 9 NNE	May 6	Oct 5	150 days	1,183 ft
Sauk City Wastewater Plant	May 4	Oct 6	155 days	750 ft
Saukville Wastewater Plant	May 5	Oct 11	158 days	766 ft
Saxon 1wsw	May 23	Oct 1	132 days	1,165 ft
Shawano 2ssw	May 9	Oct 2	144 days	806 ft
Sheboygan	Apr 25	Oct 23	179 days	648 ft
Sheboygan Co Mem Airport	May 5	Oct 8	154 days	746 ft
Sheboygan Wastewater Plant	May 2	Oct 21	169 days	603 ft
Slinger Wastewater Plant	May 5	Oct 5	152 days	1,029 ft
Solon Springs	May 12	Oct 2	142 days	1,130 ft
South Milwaukee Wastewater Plant	Apr 22	Oct 26	184 days	650 ft
Sparta	May 9	Oct 1	144 days	782 ft
Spooner Ag Reservoir Station	May 14	Sep 28	135 days	1,100 ft
St. Croix Falls	May 4	Oct 8	156 days	750 ft
St. Germain	May 19	Oct 3	136 days	1,643 ft
Stanley Wastewater Plant	May 7	Oct 3	147 days	1,080 ft
Steuben 4 SE	Apr 22	Oct 20	179 days	1,015 ft
Stevens Point	May 4	Oct 7	155 days	1,079 ft
Stockbridge-Munsee Rsvn	May 13	Sep 30	141 days	1,050 ft
Stoughton	Apr 30	Oct 11	163 days	840 ft
Sturgeon Bay Exp. Farm	May 8	Oct 13	157 days	699 ft
Sullivan 3se	May 3	Oct 9	157 days	933 ft
Superior	May 6	Oct 9	154 days	607 ft
Suring	May 14	Oct 1	139 days	792 ft
Town Of Westford	May 1	Oct 11	163 days	879 ft
Trempealeau Dam 6	Apr 29	Oct 11	165 days	660 ft
Two Rivers	Apr 27	Oct 21	175 days	589 ft
Union Grove	May 5	Oct 8	156 days	730 ft
Uw Arboretum - Madison	May 1	Oct 9	161 days	870 ft
Viroqua	May 7	Oct 2	148 days	1,255 ft
W Bend Public Works	May 1	Oct 12	161 days	980 ft
Washington Island	May 15	Oct 14	152 days	686 ft
Waterloo Wastewater Plant	Apr 30	Oct 9	163 days	800 ft
Watertown Wastewater Plant	Apr 28	Oct 12	167 days	825 ft
Waukesha Wastewater Plant	May 1	Oct 13	162 days	789 ft
Waupaca	May 8	Oct 6	151 days	837 ft
Wausau Dwtn Airport	May 6	Oct 4	150 days	1,181 ft
West Allis	Apr 26	Oct 22	177 days	723 ft
West Bend	May 4	Oct 11	157 days	940 ft
Weyerhaeuser 1n	May 9	Sep 29	140 days	1,195 ft
Whitewater	May 2	Oct 9	157 days	875 ft
Willow Rsvr	May 13	Oct 3	141 days	1,532 ft
Winter	May 19	Sep 27	129 days	1,355 ft
Wisconsin Dells	May 8	Oct 3	146 days	835 ft
Wisconsin Rapids	May 9	Sep 30	142 days	1,033 ft
Wisconsin Rapids Alexander Field	May 8	Oct 1	145 days	1,019 ft

Sources

NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.

Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.