When to plant Sweet potatoes in Wisconsin

In spring, from May 10 – June 10 in Caledonia to May 20 – June 10 in Windsor.

In fall, from May 20 – June 10 in Allouez to June 1 – 15 in Whitefish Bay.

USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Sweet potatoes planting dates by place in Wisconsin
PlaceSpringFall
AllouezMay 20 – June 10May 20 – June 10
AppletonMay 20 – June 10May 20 – June 10
AshwaubenonMay 20 – June 10May 20 – June 10
BarabooMay 20 – June 10Not listed
Beaver DamMay 20 – June 10May 20 – June 10
BellevueMay 20 – June 10May 20 – June 10
BeloitMay 20 – June 10May 20 – June 10
BrookfieldMay 20 – June 10May 20 – June 10
Brown DeerMay 20 – June 10June 1 – 15
BurlingtonMay 20 – June 10May 20 – June 10
CaledoniaMay 10 – June 10June 1 – 15
CedarburgMay 10 – June 10June 1 – 15
Chippewa FallsNot listedNot listed
CudahyMay 10 – June 10June 1 – 15
De PereMay 20 – June 10May 20 – June 10
DeForestMay 20 – June 10May 20 – June 10
Eau ClaireMay 10 – June 10May 20 – June 10
ElkhornMay 20 – June 10May 20 – June 10
FitchburgMay 20 – June 10May 20 – June 10
Fond du LacMay 20 – June 10June 1 – 15
Fort AtkinsonMay 20 – June 10May 20 – June 10
Fox CrossingMay 20 – June 10May 20 – June 10
FranklinMay 20 – June 10May 20 – June 10
GermantownNot listedMay 20 – June 10
GlendaleMay 20 – June 10June 1 – 15
GraftonMay 10 – June 10June 1 – 15
Green BayNot listedMay 20 – June 10
GreendaleMay 20 – June 10May 20 – June 10
GreenfieldMay 20 – June 10May 20 – June 10
GreenvilleMay 20 – June 10May 20 – June 10
HarrisonMay 20 – June 10May 20 – June 10
HartfordNot listedNot listed
HartlandMay 20 – June 10May 20 – June 10
HobartMay 20 – June 10May 20 – June 10
HolmenMay 10 – June 10June 1 – 15
HowardNot listedMay 20 – June 10
HudsonMay 10 – June 10June 1 – 15
JanesvilleMay 20 – June 10May 20 – June 10
KaukaunaMay 20 – June 10May 20 – June 10
KenoshaMay 20 – June 10June 1 – 15
La CrosseMay 20 – June 10May 20 – June 10
LisbonMay 20 – June 10June 1 – 15
Little ChuteMay 20 – June 10May 20 – June 10
MadisonMay 20 – June 10May 20 – June 10
ManitowocMay 20 – June 10June 1 – 15
MarinetteMay 20 – June 10May 20 – June 10
MarshfieldMay 20 – June 10Not listed
MenashaMay 20 – June 10May 20 – June 10
Menomonee FallsNot listedMay 20 – June 10
MenomonieNot listedNot listed
MequonNot listedMay 20 – June 10
MiddletonMay 20 – June 10May 20 – June 10
MilwaukeeMay 20 – June 10June 1 – 15
MonroeMay 20 – June 10May 20 – June 10
Mount PleasantMay 10 – June 10June 1 – 15
MuskegoMay 20 – June 10May 20 – June 10
NeenahMay 20 – June 10May 20 – June 10
New BerlinMay 20 – June 10May 20 – June 10
New RichmondMay 10 – June 10June 1 – 15
Oak CreekMay 10 – June 10June 1 – 15
OconomowocMay 20 – June 10May 20 – June 10
OnalaskaMay 10 – June 10June 1 – 15
OregonMay 20 – June 10May 20 – June 10
OshkoshMay 10 – June 10June 1 – 15
PewaukeeMay 20 – June 10May 20 – June 10
PlattevilleMay 20 – June 10May 20 – June 10
Pleasant PrairieMay 10 – June 10June 1 – 15
PloverMay 20 – June 10May 20 – June 10
Port WashingtonMay 20 – June 10June 1 – 15
RacineMay 10 – June 10June 1 – 15
ReedsburgMay 20 – June 10May 20 – June 10
RichfieldMay 20 – June 10June 1 – 15
River FallsNot listedNot listed
Salem LakesMay 20 – June 10May 20 – June 10
SheboyganMay 10 – June 10June 1 – 15
ShorewoodMay 20 – June 10June 1 – 15
South MilwaukeeMay 10 – June 10June 1 – 15
Stevens PointMay 20 – June 10May 20 – June 10
StoughtonMay 20 – June 10May 20 – June 10
SuamicoNot listedMay 20 – June 10
Sun PrairieMay 20 – June 10May 20 – June 10
SuperiorNot listedMay 20 – June 10
SussexMay 20 – June 10June 1 – 15
Two RiversMay 20 – June 10June 1 – 15
VeronaMay 20 – June 10May 20 – June 10
WatertownMay 20 – June 10May 20 – June 10
WaukeshaMay 20 – June 10May 20 – June 10
WaunakeeMay 20 – June 10May 20 – June 10
WaupunMay 20 – June 10May 20 – June 10
WausauNot listedNot listed
WauwatosaMay 20 – June 10June 1 – 15
West AllisMay 20 – June 10June 1 – 15
West BendMay 20 – June 10May 20 – June 10
WestonNot listedNot listed
Whitefish BayMay 20 – June 10June 1 – 15
WhitewaterMay 20 – June 10May 20 – June 10
WindsorMay 20 – June 10May 20 – June 10
Wisconsin RapidsNot listedNot listed

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. The full USDA table for sweet potatoes.