2026 Planting Guide
Spring cropWhen to Plant Soybeans in Wisconsin
Complete guide to growing soybeans in Wisconsin with optimal planting dates, recommended varieties, soil requirements, pest management, and harvest timing. Data sourced from USDA and state extension services.
Monthly Planting Calendar
Visual overview of the soybeans growing season in Wisconsin. Red diamond markers indicate frost date boundaries.
Quick Facts
Min. Soil Temp
50°F (10°C) minimum
Growing Period
95-130 days
From planting to harvest
Last Spring Frost
May 5
Wait until after this date
First Fall Frost
September 28
Harvest before this date
Monthly Task Timeline
Month-by-month guide for managing soybeans in Wisconsin.
January - April
Off-seasonCover crop planting, soil testing, equipment maintenance, and planning for next season.
May - June
PlantPrepare soil, apply starter fertilizer, and sow seeds at recommended depth and spacing.
July - September
Grow & MonitorIrrigate as needed, scout for pests, apply side-dress fertilizer, and manage weeds.
October - November
HarvestCheck maturity indicators, schedule equipment, harvest at optimal moisture content.
December
Off-seasonCover crop planting, soil testing, equipment maintenance, and planning for next season.
Best Soybeans Varieties for Wisconsin
These varieties have proven performance in Wisconsin's climate and soil conditions. Always source certified seed from reputable dealers.
| # | Variety | Best For |
|---|---|---|
| 1 | Pioneer P17A20X | Wisconsin climate |
| 2 | Asgrow AG18X0 | Wisconsin climate |
| 3 | Channel 1818R2X | Wisconsin climate |
Growing Tips for Wisconsin
Region-specific advice from agricultural extension services and experienced Wisconsin farmers.
Maturity group 1.0-2.5 across Wisconsin
Soybean aphid threshold: 250 aphids/plant with rising population
No-till soybeans successful in well-drained fields
Pest & Disease Watch
Monitor for these threats throughout the growing season. Integrated Pest Management (IPM) is recommended.
Soybean aphid
Scout regularly and use integrated pest management
Bean leaf beetle
Scout regularly and use integrated pest management
Spider mites
Scout regularly and use integrated pest management
Stink bugs
Scout regularly and use integrated pest management
Soybean cyst nematode
Scout regularly and use integrated pest management
Companion Planting
These plants grow well alongside soybeans, improving pest control, pollination, and nutrient availability.
Frost Dates
Last Spring Frost
May 5
Wait until after this date before planting frost-sensitive crops outdoors.
First Fall Frost
September 28
Plan to complete harvest of warm-season crops before this date arrives.
Frequently Asked Questions
When is the best time to plant soybeans in Wisconsin?
The optimal planting window for soybeans in Wisconsin is May 5 to June 5. Soil temperature should reach at least 50°F (10°C) minimum before planting. The total growing period is 95-130 days.
What varieties of soybeans grow best in Wisconsin?
The best varieties for Wisconsin include Pioneer P17A20X, Asgrow AG18X0, Channel 1818R2X. These varieties are adapted to local climate and soil conditions and have proven performance records.
When can I harvest soybeans in Wisconsin?
The harvest window for soybeans in Wisconsin is typically October 1 to November 1. The crop takes 95-130 days from planting to reach maturity.
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Data Sources
Data sourced from USDA NASS Crop Planting Dates, Wisconsin Cooperative Extension Service, and NOAA frost date records. Last updated: March 2026.
Planting dates are averages and may vary by county, elevation, and local microclimate. Always consult your local extension office for the most precise recommendations.