Home / Guides / Field Crops, Grains & Oilseeds
Field Crops, Grains & OilseedsDouble-Cropping Calendar: Wheat and Soybeans
Double-crop soybeans live or die by how quickly they get in the ground after wheat comes off, so the calendar starts with wheat harvest and ends with your first fall frost.
Key points
- Work backward from your first fall frost and forward from the date wheat will be harvested.
- Delay after wheat harvest generally costs soybean yield potential.
- Choose a maturity group and have seed and equipment ready before wheat harvest.
- Check soil moisture and forecasts before planting into stubble.
- Record results and compare against alternatives such as cover crops.
How does double-crop soybean timing work?
Extension publications from Penn State, Oklahoma State, Kansas State and Ohio State describe the same basic idea. Winter wheat is harvested in early summer, soybeans are planted soon afterward, and the soybean crop must finish before fall frost and cold weather. Every day of delay after wheat harvest generally costs yield potential, according to these sources.
That means your calendar runs backward from your first fall frost date and forward from the date wheat will be ready. Both dates are variable, so build in a margin.
If wheat harvest is delayed by rain or late maturity, the whole soybean window shrinks, so keep an eye on wheat moisture and harvest timing from the start of heading.
What planning steps come before wheat harvest?
Decide on the soybean variety and maturity group early, since the best choice for a late planting may differ from a full-season soybean. Check your state's variety trials and ask extension which maturity groups suit double cropping in your area.
Line up seed, planter settings and any burndown or weed control plan before harvest. The label is the law for any herbicide and your extension office or a licensed applicator can explain current recommendations, since licensing rules vary by state.
- Choose a maturity group suited to late planting
- Have seed on hand before wheat harvest
- Service the planter or drill in advance
- Plan weed control and read the label
What about moisture and straw residue?
Planting into wheat stubble can conserve moisture, but dry weather after wheat harvest can leave too little water for emergence. Check the forecast and soil moisture. If conditions are dry, extension publications discuss the trade-offs of planting right away versus waiting for rain.
Straw handling also matters. Chopping and spreading straw evenly, or baling it, affects planter performance and soil temperature. No-till and tilled approaches each have trade-offs, which your extension agent can discuss.
Row spacing and seeding method can also shift the outcome, and extension publications discuss narrower rows for late plantings. Ask which options suit your equipment.
How late is too late for double-crop soybeans?
There is no single cutoff. It depends on your latitude, your soybean maturity group and the length of your growing season. The practical test is simple: count the weeks from planting to maturity for your variety and compare with the weeks left before your average first fall frost.
For example, if your first fall frost usually falls in mid-October and a chosen variety needs a certain number of weeks to mature, plant early enough to leave a margin for a cool season. Your state extension guide gives the recommended range for your area.
What does double cropping do to fertility and risk?
Two crops in one year remove more nutrients, so use soil tests and local recommendations for both crops. Nutrient management rules differ by state.
Risk also rises. A dry summer can hurt the second crop badly, and the economics are tighter than a single crop. Ask your crop insurance agent and the USDA Risk Management Agency how double cropping is treated, and keep records for your farm service agency office.
Check the rules for your crop insurance policy and your farm service agency reporting well before planting, since final planting dates and reporting requirements for second crops are set by those programs.
How do you evaluate the system afterward?
Record the wheat harvest date, the soybean planting date, emergence, the maturity date and the yield. Compare across seasons.
If the second crop often fails to pay, consider alternatives such as a cover crop or forage after wheat. A calendar based on your results makes the decision easier.
What should you do if the window closes early?
Sometimes wheat harvest runs late, rain delays planting or a dry spell stalls emergence. In those cases, step back and compare your options: plant anyway with an earlier maturity group, switch to a forage or cover crop, or leave the field fallow with a cover.
Ask your extension office for current advice on late planted soybeans in your area, and check your crop insurance policy for the final planting date for second crops. Your insurance agent and the USDA Risk Management Agency can explain the rules.
Write down what you decided and why, because the choice you make in a tough year often becomes your plan for the next.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.