When should I plant tomatoes in ZIP 02108?

In ZIP 02108, the main tomatoes target is around Apr 27, based on the representative Boston frost station and USDA zone 7a.

When should I start tomatoes seeds indoors in 02108?

Start tomatoes seeds indoors in ZIP 02108 around Mar 9, about 42 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 tomatoes 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 tomatoes around Apr 27; this uses the Boston frost station, USDA zone 7a, and tomatoes 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 tomatoes 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.

Reviewed by GrowZone Editorial. Calculated from the boston-logan frost station and USDA zone 7a, last updated 2026-06-28.

In the Boston area, gardeners usually wait until Apr 27 to set tomato transplants out because cold snaps near Apr 20 can still matter.

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

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Answer first

When to start tomatoes seeds indoors in Boston

In ZIP 02108, start tomatoes seeds indoors around Mar 9, about 42 days before the Apr 20 last-frost estimate.

Start tomatoes seeds indoors in Boston around Mar 9, about 42 days before the Apr 20 last-frost estimate.

Seed starting schedule

Tomatoes dates for Boston, MA

Step	Date	How to use it
Start Indoors	March 9, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	April 27, 2026	Move hardened-off seedlings outside after the frost-risk 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

Tomatoes windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Mar 9

Transplant

Apr 27

Harvest

Jul 14

Frost watch

Aug 14

Reminder workflow

Every date has a next action

Start tomatoes indoorsMar 9

Last frost windowApr 20

Transplant tomatoesApr 27

First tomatoes harvest windowJul 14

Last tomatoes sowing targetAug 14

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	18-24 in	Airflow and root space affect yield.
Soil temperature	60 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

Tomatoes timing notes

Harden seedlings off for a week before transplanting. Tomatoes prefers full sun, 18-24 in spacing, and soil near 60 F+.

For fall, count backward from Oct 31. A conservative last sowing target is around Aug 14.