When to plant potatoes in Pennsylvania
Pennsylvania’s average last spring frost is May 1, and the first fall frost typically arrives around October 10 — about 162 frost-free days (USDA zones 5a, 5b, 6a, 6b, 7a, 7b). Potato needs 70–120 days to mature, which fits comfortably within Pennsylvania's growing season.
Pennsylvania covers a wide range of climates, so your exact frost dates may differ from the state average by two weeks or more. For dates tuned to your town, use the calendar generator.
When to plant potatoes in Pennsylvania: the short answer
For a spring planting, sow Apr 12 – May 1. Seeds germinate in soil from 45 to 80°F.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow potatoes in Pennsylvania, step by step
- Prepare the bed. They need at least six to eight hours of direct sun a day and loose soil at least 18 inches deep, with a pH between 4.8 and 6.5. Dig in compost before planting.
- Sow outdoors (Apr 12 – May 1). Space plants about 12 inches apart in rows 32 inches apart, sowing seed 4 inches deep. It tolerates a light frost but not a hard freeze. As a cool-season crop it does best before summer heat arrives in Pennsylvania.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: Colorado potato beetle, flea beetle, wireworm, aphids. Diseases and disorders: late blight, early blight, common scab, blackleg.
- Harvest (from about Jun 26 – Aug 15). Potato takes 70-120 days to reach harvest. Plant certified seed potatoes, not grocery-store ones. Hill soil or mulch over the stems as they grow to stop greening. New potatoes ~10 weeks in; storage potatoes after the tops die back.
Figures come from our crop data; dates use Pennsylvania’s average frost dates. More in the full potato growing guide.
Potato planting dates by USDA zone in Pennsylvania
Pennsylvania spans USDA zones 5a, 5b, 6a, 6b, 7a, 7b. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the potato dates shift with them.
When to plant potatoes in nearby states
| State | Last frost | Sow |
|---|---|---|
| Pennsylvania (this page) | May 1 | Apr 12 – May 1 |
| New Jersey | April 20 | Apr 1 – Apr 20 |
| Delaware | April 14 | Mar 26 – Apr 14 |
| Maryland | April 14 | Mar 26 – Apr 14 |
| District of Columbia | April 10 | Mar 22 – Apr 10 |
| Virginia | April 15 | Mar 27 – Apr 15 |
| West Virginia | May 5 | Apr 16 – May 5 |
Questions gardeners in Pennsylvania ask
When is the best time to plant potatoes in Pennsylvania?
Sow potatoes in Pennsylvania between April 12 and May 1. That timing is set by Pennsylvania's average last spring frost of May 1; Pennsylvania spans several climates, so cooler and higher parts of the state run later.
When will potatoes planted in Pennsylvania be ready to harvest?
Planted on time, potatoes are usually ready from about June 26 to August 15, 70-120 days after sowing.
When is the last frost in Pennsylvania?
On average around May 1, with the first fall frost around October 10 - about 162 frost-free days. Your town may differ by two weeks or more.