When to plant Spinach in Pennsylvania

In spring, from Feb 1 – Mar 20 in Chester to Apr 1 – June 15 in St. Marys.

In fall, from July 1 – Aug 15 in Hermitage to Oct 1 – Dec 1 in Philadelphia.

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 Pennsylvania
PlaceSpringFall
AllentownMar 1 – Apr 15Aug 20 – Sept 10
AltoonaMar 1 – Apr 15Aug 20 – Sept 10
BaldwinMar 1 – Apr 15Sept 1 – Oct 1
BerwickMar 20 – Apr 20Aug 1 – Sept 1
Bethel ParkMar 1 – Apr 15Sept 1 – Oct 1
BethlehemMar 1 – Apr 15Aug 20 – Sept 10
BloomsburgMar 20 – Apr 20Aug 20 – Sept 10
ButlerApr 1 – June 15Aug 1 – Sept 1
CarlisleMar 1 – Apr 15Aug 20 – Sept 10
ChambersburgMar 1 – Apr 15Aug 20 – Sept 10
ChesterFeb 1 – Mar 20Oct 1 – Dec 1Now
CoatesvilleMar 1 – Apr 15Aug 20 – Sept 10
ColumbiaMar 20 – Apr 20Aug 1 – Sept 1
DarbyFeb 1 – Mar 20Sept 15 – Nov 1Now
DunmoreMar 1 – Apr 15Aug 20 – Sept 10
EastonMar 1 – Apr 15Aug 20 – Sept 10
ElizabethtownFeb 15 – Apr 1Sept 1 – Oct 1
EmmausMar 1 – Apr 15Aug 20 – Sept 10
EphrataMar 1 – Apr 15Aug 20 – Sept 10
ErieMar 20 – Apr 20Sept 1 – Oct 1
Franklin ParkMar 1 – Apr 15Sept 1 – Oct 1
GreensburgMar 20 – Apr 20Aug 1 – Sept 1
HanoverMar 1 – Apr 15Aug 20 – Sept 10
HarrisburgFeb 15 – Apr 1Aug 20 – Sept 10
HazletonMar 20 – Apr 20Aug 20 – Sept 10
HermitageApr 1 – June 15July 1 – Aug 15
IndianaApr 1 – June 15Aug 1 – Sept 1
Jefferson HillsMar 1 – Apr 15Sept 1 – Oct 1
JohnstownMar 20 – Apr 20Aug 20 – Sept 10
KingstonMar 1 – Apr 15Aug 20 – Sept 10
LancasterMar 1 – Apr 15Aug 20 – Sept 10
LansdaleFeb 15 – Apr 1Sept 1 – Oct 1
LansdowneFeb 1 – Mar 20Sept 15 – Nov 1Now
LebanonMar 1 – Apr 15Aug 20 – Sept 10
Lower BurrellMar 1 – Apr 15Sept 1 – Oct 1
McKeesportMar 20 – Apr 20Aug 20 – Sept 10
MeadvilleMar 20 – Apr 20Aug 20 – Sept 10
MechanicsburgFeb 15 – Apr 1Sept 1 – Oct 1
MonroevilleMar 1 – Apr 15Aug 20 – Sept 10
MunhallFeb 15 – Apr 1Sept 15 – Nov 1Now
MurrysvilleMar 1 – Apr 15Aug 20 – Sept 10
NanticokeApr 1 – June 15Aug 1 – Sept 1
New CastleMar 20 – Apr 20Aug 20 – Sept 10
New KensingtonMar 1 – Apr 15Sept 1 – Oct 1
NorristownFeb 15 – Apr 1Sept 1 – Oct 1
NorthamptonMar 1 – Apr 15Aug 20 – Sept 10
PhiladelphiaFeb 1 – Mar 20Oct 1 – Dec 1Now
PhoenixvilleMar 1 – Apr 15Sept 1 – Oct 1
PittsburghMar 1 – Apr 15Sept 1 – Oct 1
PlumMar 1 – Apr 15Sept 1 – Oct 1
PottstownMar 1 – Apr 15Aug 20 – Sept 10
PottsvilleMar 20 – Apr 20Aug 20 – Sept 10
ReadingFeb 15 – Apr 1Sept 1 – Oct 1
ScrantonMar 1 – Apr 15Aug 20 – Sept 10
SharonMar 20 – Apr 20Aug 20 – Sept 10
St. MarysApr 1 – June 15Aug 1 – Sept 1
State CollegeMar 1 – Apr 15Sept 1 – Oct 1
WashingtonMar 1 – Apr 15Aug 20 – Sept 10
WaynesboroMar 1 – Apr 15Aug 20 – Sept 10
West ChesterMar 20 – Apr 20Aug 20 – Sept 10
West MifflinMar 1 – Apr 15Sept 1 – Oct 1
WhitehallMar 1 – Apr 15Sept 1 – Oct 1
Wilkes-BarreMar 1 – Apr 15Aug 20 – Sept 10
WilkinsburgFeb 15 – Apr 1Sept 15 – Nov 1Now
WilliamsportMar 1 – Apr 15Aug 20 – Sept 10
WyomissingFeb 15 – Apr 1Sept 1 – Oct 1
YeadonFeb 1 – Mar 20Sept 15 – Nov 1Now
YorkMar 20 – Apr 20Aug 20 – Sept 10

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.