When to Plant Sweet Potatoes in Wisconsin
In a typical Wisconsin location, plant outdoors May 14 – May 28. Across the state, the outdoor planting window starts as early as May 3 in Kenosha and as late as May 25 in Merrill.
Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive.
Sweet Potatoes Planting Dates by City
| City | Plant outdoors |
|---|---|
| Milwaukee | May 10 – May 24 |
| Madison | May 15 – May 29 |
| Green Bay | May 21 – Jun 4 |
| Kenosha | May 3 – May 17 |
| Racine | May 4 – May 18 |
| Appleton | May 18 – Jun 1 |
| Waukesha | May 15 – May 29 |
| Eau Claire | May 8 – May 22 |
| Oshkosh | May 8 – May 22 |
| Janesville | May 10 – May 24 |
| West Allis | May 10 – May 24 |
| La Crosse | May 11 – May 25 |
| North La Crosse | May 7 – May 21 |
| Sheboygan | May 9 – May 23 |
| Wauwatosa | May 10 – May 24 |
| Fond du Lac | May 11 – May 25 |
| New Berlin | May 17 – May 31 |
| Wausau | May 20 – Jun 3 |
| Brookfield | May 14 – May 28 |
| Greenfield | May 17 – May 31 |
| Beloit | May 15 – May 29 |
| Franklin | May 17 – May 31 |
| Menomonee Falls | May 20 – Jun 3 |
| Oak Creek | May 6 – May 20 |
| Manitowoc | May 14 – May 28 |
| Sun Prairie | May 15 – May 29 |
| West Bend | May 15 – May 29 |
| Fitchburg | May 15 – May 29 |
| Stevens Point | May 18 – Jun 1 |
| Superior | May 20 – Jun 3 |
Showing the 30 most populous of 96 Wisconsin cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Wisconsin cities.
Frequently Asked Questions
When should I plant sweet potatoes in Wisconsin?
In a typical Wisconsin location, plant outdoors May 14 – May 28. Across the state, the outdoor planting window starts as early as May 3 in Kenosha and as late as May 25 in Merrill.
When is the last frost in Wisconsin?
The average last spring frost in Wisconsin ranges from April 19 in Kenosha to May 11 in Merrill, based on NOAA 1991–2020 climate normals.
How long do sweet potatoes take to grow?
Sweet Potatoes typically take 90–120 days from planting to harvest. Set out slips 2-4 weeks after last frost once soil is thoroughly warm (65F+); very frost/cold sensitive.
Other Crops in Wisconsin
- Tomatoes
- Peppers
- Eggplant
- Cucumbers
- Zucchini
- Winter Squash
- Pumpkins
- Watermelon
- Cantaloupe
- Corn
- Green Beans
- Peas
- Lettuce
- Spinach
- Kale
- Arugula
- Swiss Chard
- Broccoli
- Cauliflower
- Cabbage
- Brussels Sprouts
- Carrots
- Beets
- Radishes
- Turnips
- Onions
- Garlic
- Potatoes
- Asparagus
- Basil
- Cilantro
- Parsley
- Dill
- Oregano
- Thyme
- Sunflowers
- Zinnias
- Marigolds
- Cosmos
- Nasturtiums
- Dahlias
When to plant sweet potatoes in other states