When to plant Summer squash (zucchini) in Indiana

In spring, from Apr 10 – June 1 in Clarksville to May 1 – June 15 in Zionsville.

In fall, June 1 – July 20.

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

Summer squash planting dates by place in Indiana
PlaceSpringFall
AndersonMay 1 – June 15June 1 – July 20
AuburnMay 1 – 30June 1 – July 15
AvonApr 20 – June 1June 1 – Aug 1
BargersvilleMay 1 – June 15June 1 – July 20
BedfordMay 1 – June 15June 1 – July 20
Beech GroveMay 1 – June 15June 1 – July 20
BloomingtonApr 20 – June 1June 1 – Aug 1
BlufftonMay 1 – June 15June 1 – July 20
BrownsburgApr 20 – June 1June 1 – Aug 1
CarmelMay 1 – June 15June 1 – July 20
Cedar LakeMay 1 – 30June 1 – July 20
ChestertonMay 1 – June 15June 1 – Aug 1
ClarksvilleApr 10 – June 1June 1 – Aug 10
Columbia CityMay 1 – 30June 1 – July 20
ColumbusApr 20 – June 1June 1 – July 20
ConnersvilleMay 1 – 30June 1 – July 15
CrawfordsvilleMay 1 – 30June 1 – July 15
Crown PointMay 1 – 30June 1 – July 20
DanvilleApr 20 – June 1June 1 – Aug 1
DecaturMay 1 – June 15June 1 – July 20
DyerMay 1 – June 15June 1 – July 20
East ChicagoMay 1 – June 15June 1 – July 20
ElkhartMay 1 – 30June 1 – July 20
EvansvilleApr 10 – June 1June 1 – Aug 10
FishersMay 1 – June 15June 1 – July 20
Fort WayneMay 1 – June 15June 1 – July 20
FrankfortMay 1 – June 15June 1 – July 20
FranklinMay 1 – June 15June 1 – July 20
GaryMay 1 – June 15June 1 – Aug 1
GoshenMay 1 – 30June 1 – July 20
GreenfieldMay 1 – June 15June 1 – July 20
GreensburgApr 20 – June 1June 1 – Aug 1
GreenwoodMay 1 – June 15June 1 – July 20
GriffithMay 1 – June 15June 1 – July 20
HammondMay 1 – June 15June 1 – July 20
HighlandMay 1 – June 15June 1 – July 20
HobartMay 1 – June 15June 1 – July 20
HuntertownMay 1 – 30June 1 – July 15
HuntingtonMay 1 – 30June 1 – July 15
IndianapolisMay 1 – June 15June 1 – July 20
JasperApr 20 – June 1June 1 – Aug 1
JeffersonvilleApr 10 – June 1June 1 – Aug 10
KendallvilleMay 1 – 30June 1 – July 20
KokomoMay 1 – 30June 1 – July 20
La PorteMay 1 – June 15June 1 – Aug 1
LafayetteMay 1 – 30June 1 – July 20
Lake StationMay 1 – June 15June 1 – Aug 1
LawrenceMay 1 – June 15June 1 – Aug 1
LebanonMay 1 – June 15June 1 – July 20
LogansportMay 1 – June 15June 1 – July 20
LowellMay 1 – 30June 1 – July 20
MadisonApr 20 – June 1June 1 – Aug 1
MarionMay 1 – 30June 1 – July 20
MartinsvilleMay 1 – June 15June 1 – July 15
McCordsvilleMay 1 – June 15June 1 – Aug 1
MerrillvilleMay 1 – June 15June 1 – July 20
Michigan CityMay 1 – June 15June 1 – Aug 1
MishawakaMay 1 – June 15June 1 – July 20
MooresvilleApr 20 – June 1June 1 – Aug 1
MuncieMay 1 – June 15June 1 – July 20
MunsterMay 1 – June 15June 1 – July 20
New AlbanyApr 10 – June 1June 1 – Aug 10
New CastleMay 1 – 30June 1 – July 20
New HavenMay 1 – 30June 1 – July 20
NoblesvilleMay 1 – June 15June 1 – July 20
PeruMay 1 – June 15June 1 – July 20
PlainfieldApr 20 – June 1June 1 – Aug 1
PlymouthMay 1 – June 15June 1 – July 20
PortageMay 1 – June 15June 1 – Aug 1
RichmondMay 1 – June 15June 1 – July 20
ScherervilleMay 1 – June 15June 1 – July 20
SellersburgApr 10 – June 1June 1 – Aug 10
SeymourMay 1 – June 15June 1 – July 20
ShelbyvilleMay 1 – June 15June 1 – July 20
South BendMay 1 – June 15June 1 – July 20
SpeedwayApr 20 – June 1June 1 – Aug 1
St. JohnMay 1 – June 15June 1 – July 20
Terre HauteApr 20 – June 1June 1 – July 20
ValparaisoMay 1 – June 15June 1 – July 20
VincennesApr 20 – June 1June 1 – Aug 1
WabashMay 1 – June 15June 1 – July 20
WarsawMay 1 – 30June 1 – July 20
WashingtonApr 20 – June 1June 1 – July 20
West LafayetteMay 1 – 30June 1 – July 20
WestfieldMay 1 – June 15June 1 – July 20
WhitestownMay 1 – June 15June 1 – July 20
YorktownMay 1 – June 15June 1 – July 20
ZionsvilleMay 1 – June 15June 1 – July 20

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 summer squash.