When to plant swiss chard in Illinois
Illinois spans USDA zones 5a–7a, so the right time to plant swiss chard shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 21 in Granite City to April 17 in McHenry — below are local dates for 226 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Chicago | 6a | April 10 | November 5 | March 27 – May 8 |
| Aurora | 5b | April 19 | October 23 | April 5 – May 17 |
| Naperville | 5b | April 28 | October 16 | April 14 – May 26 |
| Joliet | 5b | April 19 | October 25 | April 5 – May 17 |
| Rockford | 5b | April 24 | October 17 | April 10 – May 22 |
| Elgin | 5b | April 26 | October 18 | April 12 – May 24 |
| Springfield | 6a | April 15 | October 22 | April 1 – May 13 |
| Peoria | 6a | April 16 | October 23 | April 2 – May 14 |
Swiss Chard in Illinois: FAQ
When can I plant swiss chard in Illinois?
Across Illinois, the time to direct-sow swiss chard spans roughly March 21 in Granite City to April 17 in McHenry, each following that city's local frost dates.
Does the swiss chard planting date vary across Illinois?
Yes. Illinois publishes 226 cities with their own frost dates, so the right swiss chard planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does swiss chard take to grow in Illinois?
Swiss Chard takes about 50–60 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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