Planting calendar / Des Plaines, IL
Planting calendar for Des Plaines, IL
Station CHICAGO OHARE INTL AP, IL US (USW00094846) is 3.2 miles away. Median last 32°F 04/16, median first 32°F 10/28. Crop dates below come from University of Illinois Extension. Where the guide uses weeks around a frost date, those weeks are applied to the median 32°F dates because the guide does not name a 10/50/90 level.
Crops in the cited guide
Des Plaines, IL
Zone 6aAverage annual extreme minimum -10°F to -5°F
Outside the median season Growing seasonTicks: 10%, 50%, and 90%
Illinois. Nearest qualified station: CHICAGO OHARE INTL AP, IL US (USW00094846), 3.2 miles. Median last 32°F April 16. Median first 32°F October 28. The 50% growing-season length is 193 days.
Open the ZIP page · Crop guides for Illinois
32°F probabilities at this station
| 10% | 50% | 90% | |
|---|---|---|---|
| Last 32°F on or after | May 1 | April 16 | April 3 |
| First 32°F on or before | October 15 | October 28 | November 11 |
Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.
Planting calendar
Windows below are from University of Illinois Extension, When to Plant, retrieved 2026-10-10. The planting chart is divided into Northern Illinois, Central Illinois, and Southern Illinois. Median dates for the last 32-degree freeze on the same page: Northern Illinois April 8-29; Central Illinois April 8-15; Southern Illinois April 1-8. The page also says southern Illinois can generally start crops two weeks earlier than central Illinois and northern Illinois about two weeks later; the crop rows below are the chart dates, not a recalculation of that sentence.
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State crop pages: Bush beans · Beets · Broccoli · Cabbage · Carrots · Swiss chard · Sweet corn · Cucumber