Frost dates

Frost dates in Wisconsin


Typical last spring frost and first fall frost for 204 weather stations across Wisconsin, from NOAA’s 1991–2020 climate normals.

Last spring frost

Apr 27 – May 22

Typical across Wisconsin (middle: May 5)

First fall frost

Sep 27 – Oct 18

Typical across Wisconsin (middle: Oct 6)

Your own yard can differ by weeks from the nearest town. Get frost dates for your exact spot →

By town

StationLast spring frostFirst fall frostFrost-free days
Afton - Janesville Water PlantApr 26Oct 15172
Alma Dam 4Apr 28Oct 14169
AmeryMay 5Oct 4152
AntigoMay 14Sep 30139
AppletonMay 4Oct 6155
ArlingtonMay 4Oct 6155
Ashland 3 SMay 20Oct 2135
Ashland Kennedy Mem AirportMay 23Sep 29129
Augusta RSMay 7Oct 1147
BaldwinMay 6Oct 2149
BarabooMay 5Oct 5153
Bayfield 6 NMay 20Oct 8141
Bayfield Fish HatcheryMay 23Oct 2132
Beaver Dam Water PlantMay 2Oct 9160
Belgium Water PlantMay 5Oct 12160
BeloitMay 1Oct 12164
Berlin Water PlantMay 1Oct 8160
Big Falls HydroMay 7Oct 3149
BlairMay 9Oct 1145
BloomerMay 5Oct 3151
Boscobel AirportMay 3Oct 7157
BrillionMay 6Oct 6153
Brodhead Water PlantApr 29Oct 12166
Brookfield Water PlantApr 30Oct 14167
Brule RSMay 24Sep 26125
BurlingtonMay 5Oct 9157
Butternut 3 SWMay 22Sep 24125
CashtonApr 27Oct 14170
Cashton 3 NNWMay 6Oct 3150
Charmany FarmApr 28Oct 15170
ChiltonMay 1Oct 14166
Clam Lake 4 WMay 16Sep 30137
Clinton Water PlantApr 30Oct 10163
ClintonvilleMay 4Oct 6155
Crivitz High FallsMay 26Sep 22119
CumberlandMay 5Oct 4152
DaltonMay 6Oct 2149
DanburyMay 11Sep 30142
Darlington Water PlantMay 3Oct 4154
Delavan Water PlantApr 28Oct 14169
Denmark Water PlantMay 6Oct 12159
DodgeMay 5Oct 5153
Dodgeville Water PlantMay 3Oct 7157
DrummondMay 20Oct 1134
DurandMay 1Oct 10162
Eagle RvrMay 25Sep 24122
Eau Claire 3 SWApr 24Oct 14173
Eau Claire Regional AirportMay 8Oct 4149
Ellsworth 1 EMay 13Sep 29139
Ephraim 1Ne-WwtpMay 14Oct 18157
FlorenceMay 24Sep 25124
Fond Du Lac 2 SWApr 27Oct 19175
Fond Du Lac County AirportMay 1Oct 10162
Fond Du Lac Water PlantMay 1Oct 12164
Forestville-4EMay 6Oct 17164
Fort AtkinsonApr 28Oct 13168
FoxboroJun 1Sep 22113
FriendshipMay 9Oct 3147
Gays MillsMay 3Oct 7157
Genoa Dam 8Apr 22Oct 17178
GermantownMay 6Oct 8155
Goodman Sanitary DistMay 24Sep 30129
GordonMay 22Sep 26127
Grafton Water PlantApr 23Oct 24184
GrantsburgMay 11Oct 1143
Green BayMay 1Oct 11163
Green BayApr 30Oct 9162
Green Bay BotanicalMay 7Oct 9155
Hales Corners/Whitnall Park/BoMay 3Oct 14164
Hancock Experiment FarmMay 10Oct 3146
Hartford Water PlantMay 8Oct 3148
Hayward Municipal AirportMay 23Sep 22122
Hayward RSMay 22Sep 23124
HillsboroMay 5Oct 4152
Hillsboro 2 SWMay 12Sep 29140
Hingham Water PlantMay 3Oct 16166
HolcombeMay 5Oct 2150
Horicon Water PlantMay 1Oct 10162
HurleyMay 24Sep 28127
Hustisford Water PlantApr 28Oct 10165
JacksonApr 30Oct 15168
Jefferson Water PlantApr 25Oct 18176
Jim Falls 3 NWMay 1Oct 8160
Jump Rvr 3 EMay 20Sep 23126
KenoshaApr 19Oct 26190
Kenosha Regional AirportApr 28Oct 19174
KewauneeMay 1Oct 18170
La CrosseApr 27Oct 13169
La Crosse Municipal AirportApr 23Oct 17177
Ladysmith 3 WMay 27Sep 22118
Lake Geneva Water PlantApr 25Oct 21179
Lake Mills Water PlantApr 29Oct 14168
Lakewood 3 NEMay 22Sep 28129
Lancaster 4 WSWApr 27Oct 11167
Laona 6 SWMay 19Sep 29133
LodiMay 1Oct 10162
Lone Rock Tri County AirportApr 30Oct 9162
LuckMay 6Oct 4151
Lynxville Dam 9Apr 24Oct 17176
Madeline IslandMay 20Oct 9142
Madison Dane Regional AirportMay 1Oct 10162
ManitowocApr 30Oct 20173
MarinetteMay 4Oct 11160
MarkesanMay 8Oct 2147
Marshfield Experiment FarmMay 5Oct 5153
Marshfield Municipal AirportMay 5Oct 5153
Mather 3 NWMay 6Oct 3150
Mauston 1 SEMay 2Oct 7158
Mazomanie Water PlantMay 7Oct 1147
MedfordMay 11Oct 1143
Mellen 4 NEMay 26Sep 27124
MenomonieMay 9Oct 1145
MerrillMay 11Sep 30142
Milwaukee Mitchell AirportApr 19Oct 29193
MinocquaMay 23Sep 27127
Minong 5 WSWMay 10Oct 4147
MondoviMay 10Oct 2145
Monroe Water PlantApr 27Oct 14170
MontelloMay 3Oct 5155
Mount Mary CollegeApr 26Oct 18175
NecedahMay 17Sep 25131
Necedah 5 WNWMay 1Oct 3155
Neillsville 3 ESEMay 10Oct 1144
New LondonMay 4Oct 6155
North PelicanJun 3Sep 18107
Oconomowoc Water PlantApr 30Oct 12165
Oconto 4 WMay 9Oct 6150
OshkoshApr 24Oct 20179
Oshkosh Wittman AirportApr 30Oct 13166
Owen 1 EMay 13Sep 26136
Paddock LakeApr 30Oct 15168
Park Falls Dnr HQMay 15Sep 28136
Pattison Ranger StaionMay 18Oct 3138
Pell LakeApr 30Oct 13166
PeshtigoMay 11Oct 5147
PlattevilleApr 30Oct 13166
Plymouth Water PlantMay 3Oct 10160
Port WashingtonApr 27Oct 22178
Port WingMay 31Oct 2124
Portage Water PlantApr 28Oct 10165
Prairie Du ChienApr 28Oct 12167
Prentice #2May 23Sep 23123
RacineApr 20Oct 24187
Racine Batten AirportApr 24Oct 24183
ReedsburgMay 2Oct 7158
Rest LakeMay 25Sep 21119
RhinelanderMay 22Sep 24125
Rhinelander 4 NEMay 23Sep 23123
Rhinelander Oneida AirportMay 26Sep 23120
Rice LakeMay 8Oct 2147
Rice Reservoir Tomahawk-2May 10Oct 4147
Richfield 3 SSWApr 30Oct 16169
Richland CtrMay 5Oct 6154
Ridgeland 1 NNEMay 10Sep 29142
Ripon 5 NEMay 1Oct 11163
River FallsMay 11Oct 1143
Rochester Water PlantMay 5Oct 10158
Rock Springs 3 SWApr 24Oct 20179
Rosholt 9 NNEMay 6Oct 5152
Sauk City Water PlantMay 4Oct 6155
Saukville Water PlantMay 5Oct 11159
Saxon 1 WSWMay 23Oct 1131
Shawano 2 SSWMay 9Oct 2146
SheboyganApr 25Oct 23181
Sheboygan County Mem AirportMay 5Oct 8156
Sheboygan Water PlantMay 2Oct 21172
Slinger Water PlantMay 5Oct 5153
Solon SpringsMay 12Oct 2143
South Milwaukee Water PlantApr 22Oct 26187
SpartaMay 9Oct 1145
Spooner Ag Res StationMay 14Sep 28137
St Croix FallsMay 4Oct 8157
St GermainMay 19Oct 3137
Stanley Water PlantMay 7Oct 3149
Steuben 4 SEApr 22Oct 20181
Stevens PtMay 4Oct 7156
Stockbridge-Munsee RsvnMay 13Sep 30140
StoughtonApr 30Oct 11164
Sturgeon Bay Experiment FarmMay 8Oct 13158
Sullivan 3 SEMay 3Oct 9159
SuperiorMay 6Oct 9156
SuringMay 14Oct 1140
Town Of WestfordMay 1Oct 11163
Trempealeau Dam 6Apr 29Oct 11165
Two RiversApr 27Oct 21177
Union GroveMay 5Oct 8156
Uw Arboretum - MadisonMay 1Oct 9161
ViroquaMay 7Oct 2148
W Bend Public WorksMay 1Oct 12164
Washington IsMay 15Oct 14152
Waterloo Water PlantApr 30Oct 9162
Watertown Water PlantApr 28Oct 12167
Waukesha Water PlantMay 1Oct 13165
WaupacaMay 8Oct 6151
Wausau Dwtn AirportMay 6Oct 4151
West AllisApr 26Oct 22179
West BendMay 4Oct 11160
Weyerhaeuser 1 NMay 9Sep 29143
WhitewaterMay 2Oct 9160
Willow ReservoirMay 13Oct 3143
WinterMay 19Sep 27131
Wisconsin DellsMay 8Oct 3148
Wisconsin RapidsMay 9Sep 30144
Wisconsin Rapids Alexander FieldMay 8Oct 1146

Each date is the median: in half of years the frost comes earlier, in half later. Frost here means a low of 32°F or colder at the station. Low spots and valleys often frost a week or two earlier than these dates; hillsides and city centers later.

Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020. The Field almanac also shows how often frost comes early or late, and a reanalysis reading for your exact location.

Frost dates for every state