2026 Planting Guide
Spring cropWhen to Plant Soybeans in Iowa
Complete guide to growing soybeans in Iowa 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 Iowa. Red diamond markers indicate frost date boundaries.
Quick Facts
Min. Soil Temp
50°F (10°C) minimum
Growing Period
100-140 days
From planting to harvest
Last Spring Frost
April 25
Wait until after this date
First Fall Frost
October 8
Harvest before this date
Monthly Task Timeline
Month-by-month guide for managing soybeans in Iowa.
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 - August
Grow & MonitorIrrigate as needed, scout for pests, apply side-dress fertilizer, and manage weeds.
September - 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 Iowa
These varieties have proven performance in Iowa's climate and soil conditions. Always source certified seed from reputable dealers.
| # | Variety | Best For |
|---|---|---|
| 1 | Asgrow AG27X0 | Iowa climate |
| 2 | Pioneer P25A70X | Iowa climate |
| 3 | Channel 2618R2X | Iowa climate |
| 4 | Beck 274NX | Iowa climate |
Growing Tips for Iowa
Region-specific advice from agricultural extension services and experienced Iowa farmers.
Inoculate seed if field has not grown soybeans in 3+ years
Plant 130,000-140,000 seeds/acre in 15-inch rows
Early planting (May 1-10) maximizes yield potential in Iowa
Scout for soybean cyst nematode — rotate resistant varieties
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
April 25
Wait until after this date before planting frost-sensitive crops outdoors.
First Fall Frost
October 8
Plan to complete harvest of warm-season crops before this date arrives.
Frequently Asked Questions
When is the best time to plant soybeans in Iowa?
The optimal planting window for soybeans in Iowa is May 1 to June 5. Soil temperature should reach at least 50°F (10°C) minimum before planting. The total growing period is 100-140 days.
What varieties of soybeans grow best in Iowa?
The best varieties for Iowa include Asgrow AG27X0, Pioneer P25A70X, Channel 2618R2X, Beck 274NX. These varieties are adapted to local climate and soil conditions and have proven performance records.
When can I harvest soybeans in Iowa?
The harvest window for soybeans in Iowa is typically September 25 to November 1. The crop takes 100-140 days from planting to reach maturity.
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Data Sources
Data sourced from USDA NASS Crop Planting Dates, Iowa 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.