When to plant broccoli in Connecticut
Connecticut’s average last spring frost is April 25, and the first fall frost typically arrives around October 15 — about 173 frost-free days (USDA zones 5b, 6a, 6b, 7a). Broccoli needs 60–85 days to mature, which fits comfortably within Connecticut's growing season.
When to plant broccoli in Connecticut: the short answer
For a spring planting, plant out Apr 4 – Apr 21, with seeds started indoors Mar 7 – Mar 21. 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 broccoli in Connecticut, step by step
- Start seeds indoors (Mar 7 – Mar 21). 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 7.0. Dig in compost before planting.
- Plant out (Apr 4 – Apr 21). 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 Connecticut.
- 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: cabbage worm, cabbage looper, aphids, flea beetle, cabbage root maggot. Diseases and disorders: clubroot, black rot, downy mildew.
- Harvest (from about Jun 10 – Jul 5). Broccoli takes 60-85 days to reach harvest. Days to maturity counted from transplant. Keep cutting side shoots after the main head for weeks. Spring crop must size up before heat or it buttons.
Figures come from our crop data; dates use Connecticut’s average frost dates. More in the full broccoli growing guide.
Broccoli planting dates by USDA zone in Connecticut
Connecticut spans USDA zones 5b, 6a, 6b, 7a. 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 broccoli dates shift with them.
When to plant broccoli in nearby states
| State | Last frost | Plant out |
|---|---|---|
| Connecticut (this page) | April 25 | Apr 4 – Apr 21 |
| Maine | May 14 | Apr 23 – May 10 |
| New Hampshire | May 13 | Apr 22 – May 9 |
| Vermont | May 14 | Apr 23 – May 10 |
| Massachusetts | April 24 | Apr 3 – Apr 20 |
| Rhode Island | April 25 | Apr 4 – Apr 21 |
| New York | May 1 | Apr 10 – Apr 27 |
Questions gardeners in Connecticut ask
When is the best time to plant broccoli in Connecticut?
Plant broccoli transplants outdoors in Connecticut between April 4 and April 21. That timing is set by Connecticut's average last spring frost of April 25.
When should I start broccoli seeds indoors in Connecticut?
Start seeds indoors between March 7 and March 21, about 6 weeks before the last frost, so the seedlings are ready to plant out from April 4.
Can I plant broccoli in the fall in Connecticut?
Yes. For a fall crop, start transplants between July 6 and July 23, so the crop matures in cool weather before Connecticut's first frost around October 15.
When will broccoli planted in Connecticut be ready to harvest?
Planted on time, broccoli is usually ready from about June 10 to July 5, 60-85 days after transplanting.
When is the last frost in Connecticut?
On average around April 25, with the first fall frost around October 15 - about 173 frost-free days. Your town may differ by two weeks or more.