When to Plant Brussels Sprout in New Hampshire

Growing Brussels Sprout in New Hampshire: Complete Guide

Brussels Sprout (Brassica oleracea var. gemmifera) is a warm-season crop that needs a head start indoors before New Hampshire's last frost. Depending on your zone, New Hampshire gardeners start seeds indoors between January 21, 2027 (Zone 6b) and February 20, 2027 (Zone 4a), then move transplants outside once their zone's last frost has passed — the zone table above has your exact dates.

Because New Hampshire stretches across 6 USDA hardiness zones (4a, 4b, 5a, 5b, 6a, 6b), 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 84 days to maturity, Brussels Sprout needs the indoor head start that New Hampshire's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.

Brussels Sprout requires full sun and regular 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 New Hampshire.