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When to Plant Zucchini in Pennsylvania

In a typical Pennsylvania location, start seeds indoors Mar 30 – Apr 6, then sow outdoors Apr 27 – May 11, then transplant outdoors Apr 27 – May 4. Across the state, the outdoor planting window starts as early as Apr 6 in Philadelphia and as late as May 22 in Hermitage.

Method Direct sow
Days to maturity 45–55 days

Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.

Zucchini Planting Dates by City

CityStart indoorsDirect sowTransplant
PhiladelphiaMar 9 – Mar 16Apr 6 – Apr 20Apr 6 – Apr 13
PittsburghApr 3 – Apr 10May 1 – May 15May 1 – May 8
AllentownMar 30 – Apr 6Apr 27 – May 11Apr 27 – May 4
ErieApr 5 – Apr 12May 3 – May 17May 3 – May 10
ReadingMar 24 – Mar 31Apr 21 – May 5Apr 21 – Apr 28
ScrantonApr 2 – Apr 9Apr 30 – May 14Apr 30 – May 7
BethlehemMar 30 – Apr 6Apr 27 – May 11Apr 27 – May 4
BensalemMar 31 – Apr 7Apr 28 – May 12Apr 28 – May 5
LancasterMar 29 – Apr 5Apr 26 – May 10Apr 26 – May 3
AbingtonMar 21 – Mar 28Apr 18 – May 2Apr 18 – Apr 25
LevittownMar 31 – Apr 7Apr 28 – May 12Apr 28 – May 5
HavertownMar 9 – Mar 16Apr 6 – Apr 20Apr 6 – Apr 13
HarrisburgMar 25 – Apr 1Apr 22 – May 6Apr 22 – Apr 29
AltoonaApr 4 – Apr 11May 2 – May 16May 2 – May 9
YorkApr 5 – Apr 12May 3 – May 17May 3 – May 10
State CollegeMar 30 – Apr 6Apr 27 – May 11Apr 27 – May 4
Wilkes-BarreApr 2 – Apr 9Apr 30 – May 14Apr 30 – May 7
NorristownMar 18 – Mar 25Apr 15 – Apr 29Apr 15 – Apr 22
ChesterMar 9 – Mar 16Apr 6 – Apr 20Apr 6 – Apr 13
Mount LebanonMar 28 – Apr 4Apr 25 – May 9Apr 25 – May 2
Bethel ParkMar 28 – Apr 4Apr 25 – May 9Apr 25 – May 2
WayneMar 18 – Mar 25Apr 15 – Apr 29Apr 15 – Apr 22
RadnorMar 18 – Mar 25Apr 15 – Apr 29Apr 15 – Apr 22
WilliamsportApr 4 – Apr 11May 2 – May 16May 2 – May 9
MonroevilleApr 1 – Apr 8Apr 29 – May 13Apr 29 – May 6
Cranberry TownshipMar 18 – Mar 25Apr 15 – Apr 29Apr 15 – Apr 22
Drexel HillMar 12 – Mar 19Apr 9 – Apr 23Apr 9 – Apr 16
PlumMar 26 – Apr 2Apr 23 – May 7Apr 23 – Apr 30
Back MountainApr 2 – Apr 9Apr 30 – May 14Apr 30 – May 7
EastonMar 28 – Apr 4Apr 25 – May 9Apr 25 – May 2

Showing the 30 most populous of 121 Pennsylvania cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Pennsylvania cities.

Frequently Asked Questions

When should I plant zucchini in Pennsylvania?

In a typical Pennsylvania location, start seeds indoors Mar 30 – Apr 6, then sow outdoors Apr 27 – May 11, then transplant outdoors Apr 27 – May 4. Across the state, the outdoor planting window starts as early as Apr 6 in Philadelphia and as late as May 22 in Hermitage.

When is the last frost in Pennsylvania?

The average last spring frost in Pennsylvania ranges from March 30 in Philadelphia to May 15 in Hermitage, based on NOAA 1991–2020 climate normals.

How long do zucchini take to grow?

Zucchini typically take 45–55 days from planting to harvest. Fast-growing squash; direct sow 1-3 weeks after last frost, or start indoors 2-3 weeks early for a head start.

Other Crops in Pennsylvania

When to plant zucchini in other states

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