When to plant cauliflower 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). Cauliflower needs 60–90 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 cauliflower in Pennsylvania: the short answer
For a spring planting, plant out Apr 10 – Apr 27, with seeds started indoors Mar 13 – Mar 27. Seeds germinate in soil from 45 to 85°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 cauliflower in Pennsylvania, step by step
- Start seeds indoors (Mar 13 – Mar 27). Sow seeds ½ inch deep in seed-starting mix under bright light. They take 5-10 days to sprout, fastest in soil around 75°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 6.0 and 7.5. Dig in compost before planting.
- Plant out (Apr 10 – Apr 27). Space plants about 18 inches apart in rows 30 inches apart. 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. It needs plenty of water; keep the soil evenly moist and never let it dry out.
- Watch for pests and problems. Pests: cabbage worm, cabbage looper, aphids, cabbage root maggot. Diseases and disorders: clubroot, black rot, downy mildew.
- Harvest (from about Jun 16 – Jul 16). Cauliflower takes 60-90 days to reach harvest. The fussiest brassica - any check from cold, heat, or drought ruins the head. Fall crops are far more reliable than spring. Blanch white types by tying leaves over the curd.
Figures come from our crop data; dates use Pennsylvania’s average frost dates. More in the full cauliflower growing guide.
Cauliflower 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 cauliflower dates shift with them.
When to plant cauliflower in nearby states
| State | Last frost | Plant out |
|---|---|---|
| Pennsylvania (this page) | May 1 | Apr 10 – Apr 27 |
| New Jersey | April 20 | Mar 30 – Apr 16 |
| Delaware | April 14 | Mar 24 – Apr 10 |
| Maryland | April 14 | Mar 24 – Apr 10 |
| District of Columbia | April 10 | Mar 20 – Apr 6 |
| Virginia | April 15 | Mar 25 – Apr 11 |
| West Virginia | May 5 | Apr 14 – May 1 |
Questions gardeners in Pennsylvania ask
When is the best time to plant cauliflower in Pennsylvania?
Plant cauliflower transplants outdoors in Pennsylvania between April 10 and April 27. 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 cauliflower seeds indoors in Pennsylvania?
Start seeds indoors between March 13 and March 27, about 6 weeks before the last frost, so the seedlings are ready to plant out from April 10.
Can I plant cauliflower in the fall in Pennsylvania?
Yes. For a fall crop, start transplants between July 1 and July 18, so the crop matures in cool weather before Pennsylvania's first frost around October 10.
When will cauliflower planted in Pennsylvania be ready to harvest?
Planted on time, cauliflower is usually ready from about June 16 to July 16, 60-90 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.