When to plant eggplants 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). Eggplant needs 65–85 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 eggplants in Pennsylvania: the short answer
For a spring planting, plant out May 15 – Jun 1, with seeds started indoors Feb 20 – Mar 6. Wait until the soil is at least 70°F and frost is over.
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 eggplants in Pennsylvania, step by step
- Start seeds indoors (Feb 20 – Mar 6). Sow seeds ¼ inch deep in seed-starting mix under bright light. They take 7-14 days to sprout, fastest in soil around 85°F. Harden seedlings off for a week before they go outside.
- 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 5.5 and 6.5. Dig in compost before planting.
- Plant out (May 15 – Jun 1). Space plants about 20 inches apart in rows 30 inches apart. It is killed by frost, so nothing goes outside until the danger has passed.
- 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: flea beetle, Colorado potato beetle, aphids, spider mite. Diseases and disorders: verticillium wilt, phomopsis blight, bacterial wilt.
- Harvest (from about Jul 26 – Aug 15). Eggplant takes 65-85 days to reach harvest. The most heat-demanding common vegetable - do not rush it into cold soil. Flea beetles hammer young plants; a row cover until flowering pays off.
Figures come from our crop data; dates use Pennsylvania’s average frost dates. More in the full eggplant growing guide.
Eggplant 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 eggplant dates shift with them.
When to plant eggplants in nearby states
| State | Last frost | Plant out |
|---|---|---|
| Pennsylvania (this page) | May 1 | May 15 – Jun 1 |
| New Jersey | April 20 | May 4 – May 21 |
| Delaware | April 14 | Apr 28 – May 15 |
| Maryland | April 14 | Apr 28 – May 15 |
| District of Columbia | April 10 | Apr 24 – May 11 |
| Virginia | April 15 | Apr 29 – May 16 |
| West Virginia | May 5 | May 19 – Jun 5 |
Questions gardeners in Pennsylvania ask
When is the best time to plant eggplants in Pennsylvania?
Plant eggplant transplants outdoors in Pennsylvania between May 15 and June 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 should I start eggplant seeds indoors in Pennsylvania?
Start seeds indoors between February 20 and March 6, about 9 weeks before the last frost, so the seedlings are ready to plant out from May 15.
What is the latest I can plant eggplants in Pennsylvania?
About August 6. Eggplants need at least 65 days to mature after transplanting, and frost around October 10 ends the season, so later plantings risk being cut short.
When will eggplants planted in Pennsylvania be ready to harvest?
Planted on time, eggplants are usually ready from about July 26 to August 15, 65-85 days after transplanting.
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.