When to plant lettuce 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). Lettuce needs 30–60 days to mature, which fits comfortably within Connecticut's growing season.
When to plant lettuce in Connecticut: the short answer
For a spring planting, plant out Apr 4 – Apr 21, with seeds started indoors Mar 21 – Apr 4. Seeds germinate in soil from 35 to 80°F.
Succession sow again in Connecticut: Apr 23 · May 5 · May 17 · May 29
Spring succession stops before summer heat makes it bolt. Start sowing again in late summer for a fall crop (see the fall window above).
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 lettuce in Connecticut, step by step
- Start seeds indoors (Mar 21 – Apr 4). Sow seeds ⅛ inch deep in seed-starting mix under bright light. They take 2-10 days to sprout, fastest in soil around 65°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. It needs six or more hours of sun for the best growth, though four to six hours in partial shade is enough and loose soil at least 8 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 10 inches apart in rows 14 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: aphids, slugs, snails, cutworm. Diseases and disorders: downy mildew, bottom rot, tipburn (calcium disorder).
- Harvest (from about May 11 – Jun 10). Lettuce takes 30-60 days to reach harvest. Seed needs light - barely cover it. Will not germinate above ~80 F soil. Loose-leaf types give the fastest, most forgiving cut-and-come-again harvest.
Figures come from our crop data; dates use Connecticut’s average frost dates. More in the full lettuce growing guide.
Lettuce 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 lettuce dates shift with them.
When to plant lettuce 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 lettuce in Connecticut?
Plant lettuce 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 lettuce seeds indoors in Connecticut?
Start seeds indoors between March 21 and April 4, about 4 weeks before the last frost, so the seedlings are ready to plant out from April 4.
Can I plant lettuce in the fall in Connecticut?
Yes. For a fall crop, sow between August 10 and August 27, so the crop matures in cool weather before Connecticut's first frost around October 15.
When will lettuce planted in Connecticut be ready to harvest?
Planted on time, lettuce is usually ready from about May 11 to June 10, 30-60 days after planting.
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.