Massachusetts planting calendar

When to plant summer squash in Massachusetts — sow, transplant & harvest dates

Massachusetts is mostly USDA zone 6b (range 5b-7b). Dates below are derived from summer squash's frost tolerance and Massachusetts's frost window — not generic national averages.

Summer squash planting timetable for Massachusetts

Stage	When in Massachusetts	Anchor
Start seeds indoors	early April (April 4)	3 weeks before the last frost (late April)
Transplant outside	early May (May 9)	14 days after the last frost (late April)
First harvest (estimate)	early July (July 3)	~55 days from transplant

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why Massachusetts's climate shifts the summer squash dates

Massachusetts's last spring frost averages late April and first fall frost mid-October, which sets the whole planting clock. Massachusetts has a four-season New England climate, with the coast and Cape running a full zone warmer than the western Berkshires. Wait for warm soil — summer squash stall in cold ground even after the air warms, so don't rush them out.

Summer squash (zucchini, yellow crookneck, pattypan) wants the same warm soil as cucumbers — 18 °C minimum at sowing depth. A single plant can outproduce a small family once it gets going, so don't over-plant.

Frost-risk note

Don't plant before late April — even a light frost will kill seedlings overnight. In the Berkshire hills in the west (zone 5b) the safe date runs a week or two later.

Regional variation within Massachusetts

the Berkshire hills in the west (zone 5b) runs roughly 1-2 weeks behind the state average; Cape Cod and the islands (zone 7b) can plant 1-2 weeks earlier.

Boston — USDA zone 7a
Worcester — USDA zone 6a
Springfield — USDA zone 6b
Cape Cod — USDA zone 7b

What else to plant in Massachusetts around then

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Quick-grow guide

Sun: Full sun — 6-8 hours direct.
Soil temperature for germination: 21-29 °C (70-85 °F).
Spacing: 24-36 inches (60-90 cm) between plants.
Days to harvest: ~55 days from planting out.

Frequently asked questions

When is the best time to plant summer squash in Massachusetts?

In Massachusetts (mostly USDA zone 6b), sow summer squash indoors around early April, transplant outdoors early May (after the last frost, late April), and harvest from early July. Summer squash are frost-tender — a single light frost kills seedlings, so they only go outside once frost danger has fully passed and the soil is warm.

What USDA zone is Massachusetts?

Most of Massachusetts sits in USDA hardiness zone 6b, with the state spanning roughly 5b-7b from the Berkshire hills in the west (zone 5b) to Cape Cod and the islands (zone 7b). The last spring frost averages late April and the first fall frost mid-October.

Can you grow summer squash in Massachusetts?

Yes. Massachusetts's dominant zone 6b supports summer squash — the key is timing. Summer squash are frost-tender — a single light frost kills seedlings, so they only go outside once frost danger has fully passed and the soil is warm.

Does the planting date change across Massachusetts?

the Berkshire hills in the west (zone 5b) runs roughly 1-2 weeks behind the state average; Cape Cod and the islands (zone 7b) can plant 1-2 weeks earlier.

What else can I plant in Massachusetts around the same time?

Pair the post-frost slot with other warm-season crops — peppers, beans, squash, and cucumbers.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.