When should I plant lettuce in ZIP 02108?

In ZIP 02108, the main lettuce target is around Apr 6, based on the representative Boston frost station and USDA zone 7a.

When should I start lettuce seeds indoors in 02108?

Start lettuce seeds indoors in ZIP 02108 around Mar 23, about 28 days before the Apr 20 last-frost estimate.

Is this a guaranteed planting date?

No. GrowZone uses frost-date estimates, hardiness zones, and crop timing rules for planning. Local microclimates and current weather can shift the right date.

ZIP 02108 planting calendar

When to plant lettuce in Boston, MA - Zone 7a

Q: When is the first frost in Boston?

Boston (ZIP 02108) has an average first fall frost around Oct 31, leaving about 194 frost-free days.

In ZIP 02108, plant lettuce around Apr 6; this uses the Boston frost station, USDA zone 7a, and lettuce timing rules.

Your Boston calendar has a 194-day estimated frost-free season. This estimate uses the representative Boston frost station, USDA zone 7a, and lettuce timing rules.

Source: boston-logan frost station, USDA zone 7a, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

USDA zone 7a Boston frost station UMass Extension Updated 2026-06-28

Read the method

Answer first

When to start lettuce seeds indoors in Boston

In ZIP 02108, start lettuce seeds indoors around Mar 23, about 28 days before the Apr 20 last-frost estimate.

Start lettuce seeds indoors in Boston around Mar 23, about 28 days before the Apr 20 last-frost estimate.

Seed starting schedule

Lettuce dates for Boston, MA

Step	Date	How to use it
Start Indoors	March 23, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	April 6, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	April 6, 2026	Sow seed outside when the crop and soil can handle the window.

Last frost

When is the last frost in Boston?

Boston (ZIP 02108) has an average last spring frost around Apr 20.

First frost

When is the first frost in Boston?

The average first fall frost is around Oct 31, giving about 194 frost-free days.

Season map

Lettuce windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Mar 23

Direct sow

Apr 6

Transplant

Apr 6

Harvest

May 31

Frost watch

Sep 6

Reminder workflow

Every date has a next action

Start lettuce indoorsMar 23

Direct sow lettuceApr 6

Transplant lettuceApr 6

Last frost windowApr 20

First lettuce harvest windowMay 31

Last lettuce sowing targetSep 6

Signal	Value	Why it matters
Last frost estimate	April 20, 2026	Warm-season transplant risk starts falling after this window.
First frost estimate	October 31, 2026	Fall planting counts backward from this date.
Season length	194 days	Longer seasons can support succession crops.
Spacing	8-12 in	Airflow and root space affect yield.
Soil temperature	40 F+	Seeds and transplants stall in cold soil.

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Local data

Why this date changes by ZIP

Boston frost history and USDA zone 7a shift the safe planting window. GrowZone uses a local representative station instead of one national rule.

UMass Extension is the kind of local source to verify against when a crop is expensive, weather is unusual, or your yard has a cold pocket.

Crop note

Lettuce timing notes

Succession sow every 10-14 days while weather is cool. Lettuce prefers sun to part shade, 8-12 in spacing, and soil near 40 F+.

For fall, count backward from Oct 31. A conservative last sowing target is around Sep 6.