When to plant carrots in Illinois
Illinois’s average last spring frost is April 20, and the first fall frost typically arrives around October 14 — about 177 frost-free days (USDA zones 5a, 5b, 6a, 6b, 7a). Carrot needs 60–80 days to mature, which fits comfortably within Illinois's growing season.
When to plant carrots in Illinois: the short answer
For a spring planting, sow Mar 25 – Apr 13. Seeds germinate in soil from 40 to 85°F.
Succession sow again in Illinois: Apr 17 · May 5 · May 23
Spring succession stops before summer heat makes it bolt. Start sowing again in late summer for a fall crop (see the fall window above).
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow carrots in Illinois, step by step
- Prepare the bed. They need six or more hours of sun for the best growth, though four to six hours in partial shade is enough and loose soil at least 12 inches deep, with a pH between 5.5 and 7.0. Dig in compost before planting.
- Sow outdoors (Mar 25 – Apr 13). Space plants about 3 inches apart in rows 12 inches apart, sowing seed ¼ inch deep. It handles frost well, so it can go out before the last frost date. As a cool-season crop it does best before summer heat arrives in Illinois.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: carrot rust fly, wireworm, root-knot nematode, aphids. Diseases and disorders: alternaria leaf blight, cavity spot, aster yellows.
- Harvest (from about May 29 – Jun 18). Carrot takes 60-80 days to reach harvest. Never transplant. Keep the surface constantly moist for the slow 2-3 week germination - a board or burlap over the row helps. Needs loose, stone-free soil or roots fork.
Figures come from our crop data; dates use Illinois’s average frost dates. More in the full carrot growing guide.
Carrot planting dates by USDA zone in Illinois
Illinois spans USDA zones 5a, 5b, 6a, 6b, 7a. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the carrot dates shift with them.
When to plant carrots in nearby states
Questions gardeners in Illinois ask
When is the best time to plant carrots in Illinois?
Sow carrots in Illinois between March 25 and April 13. That timing is set by Illinois's average last spring frost of April 20.
Can I plant carrots in the fall in Illinois?
Yes. For a fall crop, sow between July 19 and August 5, so the crop matures in cool weather before Illinois's first frost around October 14.
When will carrots planted in Illinois be ready to harvest?
Planted on time, carrots are usually ready from about May 29 to June 18, 60-80 days after sowing.
When is the last frost in Illinois?
On average around April 20, with the first fall frost around October 14 - about 177 frost-free days. Your town may differ by two weeks or more.