When to Plant Watermelon in Maine

Growing Watermelon in Maine: Complete Guide

Watermelon (Citrullus lanatus) is a warm-season crop that needs a head start indoors before Maine's last frost. Most Maine gardeners begin seeds indoors around Monday, March 23, 2026 and move transplants outside around Monday, May 4, 2026, after the risk of frost has passed.

Because Maine stretches across 8 USDA hardiness zones (3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a), planting windows can shift by as much as six to eight weeks from one end of the state to the other. Gardeners in the warmer southern zones can start earlier, while those in cooler northern zones should wait until the zone table above shows their last frost has passed.

With 80 days to maturity, Watermelon needs the indoor head start that Maine's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.

Watermelon requires full sun (8+ hours) and regular (1-2 inches/week) moisture. In the Northeast, cool summers and moderate humidity can slow warm-season crops, so choose a sheltered, south-facing spot to maximise heat.

For the most precise planting dates tailored to your exact location, enter your ZIP code on our planting calendar or use the zone table above to find the schedule for your area of Maine.