When to Plant Brussels Sprout in Wisconsin

Growing Brussels Sprout in Wisconsin: Complete Guide

Brussels Sprout (Brassica oleracea var. gemmifera) is a warm-season crop that needs a head start indoors before Wisconsin's last frost. Depending on your zone, Wisconsin gardeners start seeds indoors between January 26, 2027 (Zone 6a) and February 25, 2027 (Zone 3b), then move transplants outside once their zone's last frost has passed — the zone table above has your exact dates.

Because Wisconsin stretches across 6 USDA hardiness zones (3b, 4a, 4b, 5a, 5b, 6a), 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 Wisconsin'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. Midwest growing seasons are compressed between late spring frosts and fall cold snaps, so timing transplants precisely pays off.

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 Wisconsin.