When to Plant Kohlrabi in Illinois

Growing Kohlrabi in Illinois: Complete Guide

Kohlrabi (Brassica oleracea var. gongylodes) is a warm-season crop that needs a head start indoors before Illinois's last frost. Depending on your zone, Illinois gardeners start seeds indoors between March 13, 2027 (Zone 7a) and April 12, 2027 (Zone 5a), then move transplants outside once their zone's last frost has passed — the zone table above has your exact dates.

Because Illinois stretches across 5 USDA hardiness zones (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 55 days to maturity, Kohlrabi needs the indoor head start that Illinois's growing season requires. Starting indoors ensures you have strong transplants ready the moment outdoor conditions are right.

Kohlrabi requires full sun to partial shade and regular (consistent moisture prevents cracking) 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 Illinois.