When to plant pumpkins 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). Pumpkin needs 90–120 days to mature, which fits comfortably within Illinois's growing season.
When to plant pumpkins in Illinois: the short answer
For a spring planting, plant out Apr 20 – May 7, with seeds started indoors Mar 23 – Apr 6. Wait until the soil is at least 60°F and frost is over. For Halloween, count back 90–120 days from October 14: sow by Jun 16–Jul 16. See the Halloween plan.
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 pumpkins in Illinois, step by step
- Start seeds indoors (Mar 23 – Apr 6). Sow seeds 1 inch deep in seed-starting mix under bright light. They take 5-10 days to sprout, fastest in soil around 85°F. Harden seedlings off for a week before they go outside.
- Prepare the bed. They need at least six to eight hours of direct sun a day and loose soil at least 18 inches deep, with a pH between 5.5 and 7.5. Dig in compost before planting.
- Plant out (Apr 20 – May 7). Space plants about 48 inches apart in rows 96 inches apart. It is killed by frost, so nothing goes outside until the danger has passed.
- 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: squash vine borer, squash bug, striped cucumber beetle. Diseases and disorders: powdery mildew, bacterial wilt.
- Harvest (from about Jul 26 – Aug 25). Pumpkin takes 90-120 days to reach harvest. For Halloween pumpkins in the north, count back 100-120 days from 31 Oct and start indoors. Mini varieties can climb a strong trellis.
Figures come from our crop data; dates use Illinois’s average frost dates. More in the full pumpkin growing guide.
Planting pumpkins in Illinois for Halloween
Spring dates above suit a long season. If you want fruit ready for Halloween, count back from Illinois's average first fall frost (October 14), which comes before Halloween. Pumpkin takes 90–120 days from sowing to a mature fruit, so these are the latest sowing dates. Sow earlier for a margin, but not too early: the University of Arkansas Extension warns that pumpkins planted too early may rot before Halloween.
| Days to maturity | Latest sowing for Halloween | Typical for |
|---|---|---|
| 120 days | June 16 | slowest types (giants) |
| 100 days | July 6 | jack-o'-lantern and pie types (University of Arkansas variety table) |
| 90 days | July 16 | quickest types |
See the full growing guide for pumpkin. Days to maturity vary by variety, so check the seed packet.
Pumpkin 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 pumpkin dates shift with them.
When to plant pumpkins in nearby states
Questions gardeners in Illinois ask
When is the best time to plant pumpkins in Illinois?
Plant pumpkin transplants outdoors in Illinois between April 20 and May 7. That timing is set by Illinois's average last spring frost of April 20.
When should I start pumpkin seeds indoors in Illinois?
Start seeds indoors between March 23 and April 6, about 3 weeks before the last frost, so the seedlings are ready to plant out from April 20.
What is the latest I can plant pumpkins in Illinois?
About July 16. Pumpkins need at least 90 days to mature, and frost around October 14 ends the season, so later plantings risk being cut short. If you want ripe fruit for Halloween, the cut-off is earlier: see the Halloween dates on this page.
When will pumpkins planted in Illinois be ready to harvest?
Planted on time, pumpkins are usually ready from about July 26 to August 25, 90-120 days after planting.
When should I plant pumpkins in Illinois for Halloween?
Count back 90-120 days from October 14, Illinois's average first fall frost, which comes before Halloween: the latest sowing dates are June 16 to July 16. Sow a little earlier for a margin.
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.