When to Plant Soybeans: Soil Temperature and Dates by Region
The best time to plant soybeans and edamame, soil temperature, planting dates by region and zone, double-crop soybeans after wheat, and frost risk.
Muhammet Elma
4 November 2026
1 min read
Plant soybeans when the soil reaches at least 10–15 °C (50–60 °F) and frost danger has passed, usually 1–3 weeks after the last frost. In the US Corn Belt that is late April to mid-May; in the South, May to June.
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Planting Windows
| Region / zone | Planting |
|---|---|
| Northern US, Canada (zones 3–5) | mid-May – early June |
| Corn Belt (zones 5–6) | late April – mid-May |
| South (zones 7–9) | May – June |
| Double crop after wheat | June – early July |
| Southern Hemisphere | October – December |
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Planting Late
Yield falls by roughly 0.3–0.5% per day after the optimum window. For late or double-crop planting, use narrower rows and slightly higher seeding rates.
More Soybean Guides
- How to Grow Soybeans: The Complete Guide
- Soybean seeding rate and spacing
- Soybean inoculation
- Soybean pests and diseases
Frequently Asked Questions
Can soybeans handle frost?
No; seedlings are killed by a hard frost.
How late can soybeans be planted?
Usually until early July in warm regions, with lower yields.
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Muhammet Elma
TarlaTapan guides focus on practical, field-tested growing advice. Corrections and suggestions are welcome at info@tarlatapan.tr.