When to plant radicchio in Wisconsin
Wisconsin spans USDA zones 4b–6a, so the right time to plant radicchio shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 5 in Pleasant Prairie to April 27 in River Falls — below are local dates for 97 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Milwaukee | 6a | April 26 | October 18 | April 12 – April 26 |
| Madison | 5a | May 1 | October 9 | April 17 – May 1 |
| Green Bay | 5b | May 7 | October 9 | April 23 – May 7 |
| Kenosha | 5b | April 28 | October 19 | April 14 – April 28 |
| Racine | 6a | April 20 | October 24 | April 6 – April 20 |
| Appleton | 5b | May 4 | October 6 | April 20 – May 4 |
| Waukesha | 5b | May 1 | October 13 | April 17 – May 1 |
| Eau Claire | 4b | April 24 | October 14 | April 10 – April 24 |
Radicchio in Wisconsin: FAQ
When can I plant radicchio in Wisconsin?
Across Wisconsin, the time to transplant radicchio spans roughly April 5 in Pleasant Prairie to April 27 in River Falls, each following that city's local frost dates.
Does the radicchio planting date vary across Wisconsin?
Yes. Wisconsin publishes 97 cities with their own frost dates, so the right radicchio 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 radicchio take to grow in Wisconsin?
Radicchio takes about 60–90 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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