When to plant winter squash in Delaware
Delaware’s average last spring frost is April 14, and the first fall frost typically arrives around October 22 — about 191 frost-free days (USDA zones 7a, 7b). Winter Squash needs 80–110 days to mature, which fits comfortably within Delaware's growing season.
When to plant winter squash in Delaware: the short answer
For a spring planting, plant out Apr 14 – May 1, with seeds started indoors Mar 17 – Mar 31. Wait until the soil is at least 60°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 winter squash in Delaware, step by step
- Start seeds indoors (Mar 17 – Mar 31). Sow seeds 1 inch deep in seed-starting mix under bright light. They take 5-10 days to sprout, fastest in soil around 85°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. It needs 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 7.0. Dig in compost before planting.
- Plant out (Apr 14 – May 1). Space plants about 42 inches apart in rows 72 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: squash vine borer, squash bug, striped cucumber beetle. Diseases and disorders: powdery mildew, bacterial wilt.
- Harvest (from about Jul 10 – Aug 9). Winter Squash takes 80-110 days to reach harvest. Needs the whole season - direct sow only where you have 100+ frost-free days. Cure 10 days in warmth after harvest for storage.
Figures come from our crop data; dates use Delaware’s average frost dates. More in the full winter squash growing guide.
When to plant winter squash in nearby states
| State | Last frost | Plant out |
|---|---|---|
| Delaware (this page) | April 14 | Apr 14 – May 1 |
| New Jersey | April 20 | Apr 20 – May 7 |
| Pennsylvania | May 1 | May 1 – May 18 |
| Maryland | April 14 | Apr 14 – May 1 |
| District of Columbia | April 10 | Apr 10 – Apr 27 |
| Virginia | April 15 | Apr 15 – May 2 |
| West Virginia | May 5 | May 5 – May 22 |
Questions gardeners in Delaware ask
When is the best time to plant winter squash in Delaware?
Plant winter squash transplants outdoors in Delaware between April 14 and May 1. That timing is set by Delaware's average last spring frost of April 14.
When should I start winter squash seeds indoors in Delaware?
Start seeds indoors between March 17 and March 31, about 3 weeks before the last frost, so the seedlings are ready to plant out from April 14.
What is the latest I can plant winter squash in Delaware?
About August 3. Winter squash needs at least 80 days to mature, and frost around October 22 ends the season, so later plantings risk being cut short.
When will winter squash planted in Delaware be ready to harvest?
Planted on time, winter squash is usually ready from about July 10 to August 9, 80-110 days after planting.
When is the last frost in Delaware?
On average around April 14, with the first fall frost around October 22 - about 191 frost-free days. Your town may differ by two weeks or more.