When should I plant cucumbers in ZIP 02108?

In ZIP 02108, the main cucumbers target is around Apr 30, based on the representative Boston frost station and USDA zone 7a.

When should I start cucumbers seeds indoors in 02108?

Start cucumbers seeds indoors in ZIP 02108 around Mar 30, about 21 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 cucumbers 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 cucumbers around Apr 30; this uses the Boston frost station, USDA zone 7a, and cucumbers 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 cucumbers 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 cucumbers seeds indoors in Boston

In ZIP 02108, start cucumbers seeds indoors around Mar 30, about 21 days before the Apr 20 last-frost estimate.

Start cucumbers seeds indoors in Boston around Mar 30, about 21 days before the Apr 20 last-frost estimate.

Seed starting schedule

Cucumbers dates for Boston, MA

Step	Date	How to use it
Start Indoors	March 30, 2026	Start seeds under lights or in a bright indoor seed-starting space.
Transplant Outdoors	April 30, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	April 30, 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

Cucumbers windows by month

JanFebMarAprMayJunJulAugSepOctNovDec

Start indoors

Mar 30

Direct sow

Apr 30

Transplant

Apr 30

Harvest

Jun 29

Frost watch

Sep 1

Reminder workflow

Every date has a next action

Start cucumbers indoorsMar 30

Last frost windowApr 20

Direct sow cucumbersApr 30

Transplant cucumbersApr 30

First cucumbers harvest windowJun 29

Last cucumbers sowing targetSep 1

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	12-18 in	Airflow and root space affect yield.
Soil temperature	65 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

Cucumbers timing notes

Use a trellis if space is tight and keep soil evenly moist. Cucumbers prefers full sun, 12-18 in spacing, and soil near 65 F+.

For fall, count backward from Oct 31. A conservative last sowing target is around Sep 1.