When to plant Spinach in Wisconsin

In spring, from Mar 1 – Apr 15 in Caledonia to Apr 1 – June 15 in Wisconsin Rapids.

In fall, from July 1 – Aug 15 in Baraboo to Sept 1 – Oct 1 in South Milwaukee.

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

Spinach planting dates by place in Wisconsin
PlaceSpringFall
AllouezMar 20 – Apr 20Aug 1 – Sept 1
AppletonMar 20 – Apr 20Aug 1 – Sept 1
AshwaubenonMar 20 – Apr 20Aug 1 – Sept 1
BarabooMar 20 – Apr 20July 1 – Aug 15
Beaver DamMar 20 – Apr 20Aug 1 – Sept 1
BellevueMar 20 – Apr 20Aug 1 – Sept 1
BeloitMar 20 – Apr 20Aug 1 – Sept 1
BrookfieldMar 20 – Apr 20Aug 1 – Sept 1
Brown DeerMar 20 – Apr 20Aug 20 – Sept 10
BurlingtonMar 20 – Apr 20Aug 1 – Sept 1
CaledoniaMar 1 – Apr 15Aug 20 – Sept 10
CedarburgMar 1 – Apr 15Aug 20 – Sept 10
Chippewa FallsApr 1 – June 15July 1 – Aug 15
CudahyMar 1 – Apr 15Sept 1 – Oct 1
De PereMar 20 – Apr 20Aug 1 – Sept 1
DeForestMar 20 – Apr 20Aug 1 – Sept 1
Eau ClaireMar 1 – Apr 15Aug 1 – Sept 1
ElkhornMar 20 – Apr 20Aug 1 – Sept 1
FitchburgMar 20 – Apr 20Aug 1 – Sept 1
Fond du LacMar 20 – Apr 20Aug 20 – Sept 10
Fort AtkinsonMar 20 – Apr 20Aug 1 – Sept 1
Fox CrossingMar 20 – Apr 20Aug 1 – Sept 1
FranklinMar 20 – Apr 20Aug 1 – Sept 1
GermantownApr 1 – June 15Aug 1 – Sept 1
GlendaleMar 20 – Apr 20Aug 20 – Sept 10
GraftonMar 1 – Apr 15Aug 20 – Sept 10
Green BayApr 1 – June 15Aug 1 – Sept 1
GreendaleMar 20 – Apr 20Aug 1 – Sept 1
GreenfieldMar 20 – Apr 20Aug 1 – Sept 1
GreenvilleMar 20 – Apr 20Aug 1 – Sept 1
HarrisonMar 20 – Apr 20Aug 1 – Sept 1
HartfordApr 1 – June 15July 1 – Aug 15
HartlandMar 20 – Apr 20Aug 1 – Sept 1
HobartMar 20 – Apr 20Aug 1 – Sept 1
HolmenMar 1 – Apr 15Aug 20 – Sept 10
HowardApr 1 – June 15Aug 1 – Sept 1
HudsonMar 1 – Apr 15Aug 20 – Sept 10
JanesvilleMar 20 – Apr 20Aug 1 – Sept 1
KaukaunaMar 20 – Apr 20Aug 1 – Sept 1
KenoshaMar 20 – Apr 20Aug 20 – Sept 10
La CrosseMar 20 – Apr 20Aug 1 – Sept 1
LisbonMar 20 – Apr 20Aug 20 – Sept 10
Little ChuteMar 20 – Apr 20Aug 1 – Sept 1
MadisonMar 20 – Apr 20Aug 1 – Sept 1
ManitowocMar 20 – Apr 20Aug 20 – Sept 10
MarinetteMar 20 – Apr 20Aug 1 – Sept 1
MarshfieldMar 20 – Apr 20July 1 – Aug 15
MenashaMar 20 – Apr 20Aug 1 – Sept 1
Menomonee FallsApr 1 – June 15Aug 1 – Sept 1
MenomonieApr 1 – June 15July 1 – Aug 15
MequonApr 1 – June 15Aug 1 – Sept 1
MiddletonMar 20 – Apr 20Aug 1 – Sept 1
MilwaukeeMar 20 – Apr 20Aug 20 – Sept 10
MonroeMar 20 – Apr 20Aug 1 – Sept 1
Mount PleasantMar 1 – Apr 15Aug 20 – Sept 10
MuskegoMar 20 – Apr 20Aug 1 – Sept 1
NeenahMar 20 – Apr 20Aug 1 – Sept 1
New BerlinMar 20 – Apr 20Aug 1 – Sept 1
New RichmondMar 1 – Apr 15Aug 20 – Sept 10
Oak CreekMar 1 – Apr 15Sept 1 – Oct 1
OconomowocMar 20 – Apr 20Aug 1 – Sept 1
OnalaskaMar 1 – Apr 15Aug 20 – Sept 10
OregonMar 20 – Apr 20Aug 1 – Sept 1
OshkoshMar 1 – Apr 15Aug 20 – Sept 10
PewaukeeMar 20 – Apr 20Aug 1 – Sept 1
PlattevilleMar 20 – Apr 20Aug 1 – Sept 1
Pleasant PrairieMar 1 – Apr 15Sept 1 – Oct 1
PloverMar 20 – Apr 20Aug 1 – Sept 1
Port WashingtonMar 20 – Apr 20Aug 20 – Sept 10
RacineMar 1 – Apr 15Aug 20 – Sept 10
ReedsburgMar 20 – Apr 20Aug 1 – Sept 1
RichfieldMar 20 – Apr 20Aug 20 – Sept 10
River FallsApr 1 – June 15July 1 – Aug 15
Salem LakesMar 20 – Apr 20Aug 1 – Sept 1
SheboyganMar 1 – Apr 15Aug 20 – Sept 10
ShorewoodMar 20 – Apr 20Aug 20 – Sept 10
South MilwaukeeMar 1 – Apr 15Sept 1 – Oct 1
Stevens PointMar 20 – Apr 20Aug 1 – Sept 1
StoughtonMar 20 – Apr 20Aug 1 – Sept 1
SuamicoApr 1 – June 15Aug 1 – Sept 1
Sun PrairieMar 20 – Apr 20Aug 1 – Sept 1
SuperiorApr 1 – June 15Aug 1 – Sept 1
SussexMar 20 – Apr 20Aug 20 – Sept 10
Two RiversMar 20 – Apr 20Aug 20 – Sept 10
VeronaMar 20 – Apr 20Aug 1 – Sept 1
WatertownMar 20 – Apr 20Aug 1 – Sept 1
WaukeshaMar 20 – Apr 20Aug 1 – Sept 1
WaunakeeMar 20 – Apr 20Aug 1 – Sept 1
WaupunMar 20 – Apr 20Aug 1 – Sept 1
WausauApr 1 – June 15July 1 – Aug 15
WauwatosaMar 20 – Apr 20Aug 20 – Sept 10
West AllisMar 20 – Apr 20Aug 20 – Sept 10
West BendMar 20 – Apr 20Aug 1 – Sept 1
WestonApr 1 – June 15July 1 – Aug 15
Whitefish BayMar 20 – Apr 20Aug 20 – Sept 10
WhitewaterMar 20 – Apr 20Aug 1 – Sept 1
WindsorMar 20 – Apr 20Aug 1 – Sept 1
Wisconsin RapidsApr 1 – June 15July 1 – Aug 15

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 spinach.