When to plant leek in Pennsylvania
Pennsylvania spans USDA zones 5b–7b, so the right time to plant leek shifts by weeks across the state. The window to transplant seedlings outdoors runs from about March 2 in Philadelphia to April 17 in Hermitage — below are local dates for 86 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Philadelphia | 7b | March 30 | November 17 | March 2 – March 16 |
| Pittsburgh | 6b | April 18 | October 28 | March 21 – April 4 |
| Allentown | 7a | April 20 | October 24 | March 23 – April 6 |
| Reading | 7a | April 14 | October 29 | March 17 – March 31 |
| Erie | 7a | April 26 | November 4 | March 29 – April 12 |
| Bethlehem | 7a | April 20 | October 24 | March 23 – April 6 |
| Scranton | 6b | April 23 | October 20 | March 26 – April 9 |
| Lancaster | 7a | April 19 | October 24 | March 22 – April 5 |
Leek in Pennsylvania: FAQ
When can I plant leek in Pennsylvania?
Across Pennsylvania, the time to transplant leek spans roughly March 2 in Philadelphia to April 17 in Hermitage, each following that city's local frost dates.
Does the leek planting date vary across Pennsylvania?
Yes. Pennsylvania publishes 86 cities with their own frost dates, so the right leek planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does leek take to grow in Pennsylvania?
Leek takes about 100–120 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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