When to plant sweet potato in Wisconsin
Wisconsin spans USDA zones 4b–6a, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 10 in Pleasant Prairie to June 1 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 | May 17 – May 31 |
| Madison | 5a | May 1 | October 9 | May 22 – June 5 |
| Green Bay | 5b | May 7 | October 9 | May 28 – June 11 |
| Kenosha | 5b | April 28 | October 19 | May 19 – June 2 |
| Racine | 6a | April 20 | October 24 | May 11 – May 25 |
| Appleton | 5b | May 4 | October 6 | May 25 – June 8 |
| Waukesha | 5b | May 1 | October 13 | May 22 – June 5 |
| Eau Claire | 4b | April 24 | October 14 | May 15 – May 29 |
Sweet Potato in Wisconsin: FAQ
When can I plant sweet potato in Wisconsin?
Across Wisconsin, the time to transplant sweet potato spans roughly May 10 in Pleasant Prairie to June 1 in River Falls, each following that city's local frost dates.
Does the sweet potato planting date vary across Wisconsin?
Yes. Wisconsin publishes 97 cities with their own frost dates, so the right sweet potato 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 sweet potato take to grow in Wisconsin?
Sweet Potato takes about 90–120 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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