Question 1

When should I plant watermelon in ZIP 02108?

Accepted Answer

In ZIP 02108, the main watermelon target is around May 4, based on the representative Boston frost station and USDA zone 7a.

Question 2

When should I start watermelon seeds indoors in 02108?

Accepted Answer

Start watermelon seeds indoors in ZIP 02108 around Mar 30, about 21 days before the Apr 20 last-frost estimate.

Question 3

When is the last frost in Boston?

Accepted Answer

Boston (ZIP 02108) has an average last spring frost around Apr 20, based on the representative Boston frost station.

Question 4

When is the first frost in Boston?

Accepted Answer

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

Question 5

Is this a guaranteed planting date?

Accepted Answer

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

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	May 4, 2026	Move hardened-off seedlings outside after the frost-risk window.
Direct Sow	May 4, 2026	Sow seed outside when the crop and soil can handle the window.

Start watermelon seeds indoors around Mar 30

Watermelon dates for Boston, MA