When to plant Onion sets in Wisconsin

In spring, from Mar 10 – Apr 10 in Allouez to Apr 10 – May 1 in Wisconsin Rapids.

In fall: USDA's 1967 table lists onion sets as generally spring-planted in every place here. Newer advice from your state's extension service may differ.

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

Onion sets planting dates by place in Wisconsin
PlaceSpring
AllouezMar 10 – Apr 10
AppletonMar 10 – Apr 10
AshwaubenonMar 10 – Apr 10
BarabooMar 10 – Apr 10
Beaver DamMar 10 – Apr 10
BellevueMar 10 – Apr 10
BeloitMar 10 – Apr 10
BrookfieldMar 10 – Apr 10
Brown DeerMar 10 – Apr 10
BurlingtonMar 10 – Apr 10
CaledoniaMar 10 – Apr 1
CedarburgMar 10 – Apr 1
Chippewa FallsApr 10 – May 1
CudahyMar 10 – Apr 1
De PereMar 10 – Apr 10
DeForestMar 10 – Apr 10
Eau ClaireMar 10 – Apr 1
ElkhornMar 10 – Apr 10
FitchburgMar 10 – Apr 10
Fond du LacMar 10 – Apr 10
Fort AtkinsonMar 10 – Apr 10
Fox CrossingMar 10 – Apr 10
FranklinMar 10 – Apr 10
GermantownApr 10 – May 1
GlendaleMar 10 – Apr 10
GraftonMar 10 – Apr 1
Green BayApr 10 – May 1
GreendaleMar 10 – Apr 10
GreenfieldMar 10 – Apr 10
GreenvilleMar 10 – Apr 10
HarrisonMar 10 – Apr 10
HartfordApr 10 – May 1
HartlandMar 10 – Apr 10
HobartMar 10 – Apr 10
HolmenMar 10 – Apr 1
HowardApr 10 – May 1
HudsonMar 10 – Apr 1
JanesvilleMar 10 – Apr 10
KaukaunaMar 10 – Apr 10
KenoshaMar 10 – Apr 10
La CrosseMar 10 – Apr 10
LisbonMar 10 – Apr 10
Little ChuteMar 10 – Apr 10
MadisonMar 10 – Apr 10
ManitowocMar 10 – Apr 10
MarinetteMar 10 – Apr 10
MarshfieldMar 10 – Apr 10
MenashaMar 10 – Apr 10
Menomonee FallsApr 10 – May 1
MenomonieApr 10 – May 1
MequonApr 10 – May 1
MiddletonMar 10 – Apr 10
MilwaukeeMar 10 – Apr 10
MonroeMar 10 – Apr 10
Mount PleasantMar 10 – Apr 1
MuskegoMar 10 – Apr 10
NeenahMar 10 – Apr 10
New BerlinMar 10 – Apr 10
New RichmondMar 10 – Apr 1
Oak CreekMar 10 – Apr 1
OconomowocMar 10 – Apr 10
OnalaskaMar 10 – Apr 1
OregonMar 10 – Apr 10
OshkoshMar 10 – Apr 1
PewaukeeMar 10 – Apr 10
PlattevilleMar 10 – Apr 10
Pleasant PrairieMar 10 – Apr 1
PloverMar 10 – Apr 10
Port WashingtonMar 10 – Apr 10
RacineMar 10 – Apr 1
ReedsburgMar 10 – Apr 10
RichfieldMar 10 – Apr 10
River FallsApr 10 – May 1
Salem LakesMar 10 – Apr 10
SheboyganMar 10 – Apr 1
ShorewoodMar 10 – Apr 10
South MilwaukeeMar 10 – Apr 1
Stevens PointMar 10 – Apr 10
StoughtonMar 10 – Apr 10
SuamicoApr 10 – May 1
Sun PrairieMar 10 – Apr 10
SuperiorApr 10 – May 1
SussexMar 10 – Apr 10
Two RiversMar 10 – Apr 10
VeronaMar 10 – Apr 10
WatertownMar 10 – Apr 10
WaukeshaMar 10 – Apr 10
WaunakeeMar 10 – Apr 10
WaupunMar 10 – Apr 10
WausauApr 10 – May 1
WauwatosaMar 10 – Apr 10
West AllisMar 10 – Apr 10
West BendMar 10 – Apr 10
WestonApr 10 – May 1
Whitefish BayMar 10 – Apr 10
WhitewaterMar 10 – Apr 10
WindsorMar 10 – Apr 10
Wisconsin RapidsApr 10 – May 1

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for onion sets.