FrostCal

When to Plant Marigolds in Pennsylvania

In a typical Pennsylvania location, start seeds indoors Mar 9 – Mar 23, 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 Start indoors, then transplant
Days to maturity 45–60 days

Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed.

Marigolds Planting Dates by City

CityStart indoorsTransplant
PhiladelphiaFeb 16 – Mar 2Apr 6 – Apr 13
PittsburghMar 13 – Mar 27May 1 – May 8
AllentownMar 9 – Mar 23Apr 27 – May 4
ErieMar 15 – Mar 29May 3 – May 10
ReadingMar 3 – Mar 17Apr 21 – Apr 28
ScrantonMar 12 – Mar 26Apr 30 – May 7
BethlehemMar 9 – Mar 23Apr 27 – May 4
BensalemMar 10 – Mar 24Apr 28 – May 5
LancasterMar 8 – Mar 22Apr 26 – May 3
AbingtonFeb 28 – Mar 14Apr 18 – Apr 25
LevittownMar 10 – Mar 24Apr 28 – May 5
HavertownFeb 16 – Mar 2Apr 6 – Apr 13
HarrisburgMar 4 – Mar 18Apr 22 – Apr 29
AltoonaMar 14 – Mar 28May 2 – May 9
YorkMar 15 – Mar 29May 3 – May 10
State CollegeMar 9 – Mar 23Apr 27 – May 4
Wilkes-BarreMar 12 – Mar 26Apr 30 – May 7
NorristownFeb 25 – Mar 11Apr 15 – Apr 22
ChesterFeb 16 – Mar 2Apr 6 – Apr 13
Mount LebanonMar 7 – Mar 21Apr 25 – May 2
Bethel ParkMar 7 – Mar 21Apr 25 – May 2
WayneFeb 25 – Mar 11Apr 15 – Apr 22
RadnorFeb 25 – Mar 11Apr 15 – Apr 22
WilliamsportMar 14 – Mar 28May 2 – May 9
MonroevilleMar 11 – Mar 25Apr 29 – May 6
Cranberry TownshipFeb 25 – Mar 11Apr 15 – Apr 22
Drexel HillFeb 19 – Mar 5Apr 9 – Apr 16
PlumMar 5 – Mar 19Apr 23 – Apr 30
Back MountainMar 12 – Mar 26Apr 30 – May 7
EastonMar 7 – Mar 21Apr 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 marigolds in Pennsylvania?

In a typical Pennsylvania location, start seeds indoors Mar 9 – Mar 23, 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 marigolds take to grow?

Marigolds typically take 45–60 days from planting to harvest. Frost-tender; start indoors 4-6 weeks before last frost, transplant after all frost danger has passed.

Other Crops in Pennsylvania

When to plant marigolds in other states

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