When to Plant Beans (Green/Snap) in Wisconsin
Easy, productive, and they even improve your soil by fixing nitrogen. A perfect crop for beginners.
The Short Answer
Wisconsin Frost Dates
Your planting dates depend on which part of Wisconsin you're in. Here are the frost date ranges by region:
| Region | Zones | Last Frost (Spring) | First Frost (Fall) |
|---|---|---|---|
| Northern Wisconsin | 3b, 4a | May 15 - Jun 1 | Sep 10 - Sep 25 |
| Central Wisconsin | 4a, 4b | May 5 - May 20 | Sep 20 - Oct 5 |
| Southern Wisconsin | 4b, 5a, 5b | Apr 25 - May 10 | Oct 1 - Oct 15 |
Beans (Green/Snap) Planting Schedule for Wisconsin
Northern Wisconsin (Zones 3b, 4a)
Average last frost: May 15 - Jun 1 · Average first frost: Sep 10 - Sep 25
Central Wisconsin (Zones 4a, 4b)
Average last frost: May 5 - May 20 · Average first frost: Sep 20 - Oct 5
Southern Wisconsin (Zones 4b, 5a, 5b)
Average last frost: Apr 25 - May 10 · Average first frost: Oct 1 - Oct 15
Growing Beans (Green/Snap) in Wisconsin
Beans (Green/Snap) in Wisconsin's Climate
Beans are one of the most reliable warm-season crops for cold climates because they grow fast and mature quickly. Direct sow when soil reaches 60°F — typically late May to early June. Bush types produce a concentrated harvest in 50-55 days, which fits easily within even 100-day growing seasons. Pole types produce over a longer window but need more time to begin bearing.
Soil Considerations for Wisconsin
Rich agricultural soils in southern half. Sandy soils in central plain. Heavy clay in some lake regions. Generally fertile. Make sure soil has warmed to at least 60°F before planting beans (green/snap) outside.
Wisconsin Climate & Growing Season
Cold winters. Warm summers. Lake Michigan moderates eastern climate. Good growing season in south. Short season in north. Beans (Green/Snap) cannot tolerate any frost, so wait until all frost danger has passed before transplanting outside. Watch local forecasts carefully in spring.
Growing season length varies across Wisconsin: Northern Wisconsin (3b, 4a) has a last frost around May 15 - Jun 1, while Southern Wisconsin (4b, 5a, 5b) sees frost end around Apr 25 - May 10. This difference matters for beans (green/snap) — transplant timing shifts by several weeks across the state.
Growing Tips
Direct sow only — beans don't transplant well. Inoculate seeds with rhizobium for better nitrogen fixation.
Companion Planting
Plant beans (green/snap) alongside these companions for better growth:
Keep beans (green/snap) away from:
The Bottom Line
Last reviewed: March 29, 2026