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Field Crops, Grains & OilseedsField Crop Rotation Calendar
A rotation plan is a calendar that runs across years, so it works best as a simple table of fields, crops, planting windows and harvest dates that you update every season.
Key points
- A rotation calendar is a table of fields, crops and key dates across several years.
- Crop sequence sets how much time you have for fall work and cover crops.
- Herbicide plant-back restrictions come from the label and belong in your plan.
- Use soil tests and local recommendations for fertility each year.
- Review the plan every fall and write down what actually happened.
Why plan a rotation calendar at all?
Extension programs and the American Society of Agronomy have long described benefits from diversified rotations, including breaking pest and disease cycles, spreading workload and improving soil conditions. Adding a small grain such as wheat to a corn and soybean rotation, for example, is discussed in research summaries as one way to add diversity.
A rotation also spreads your workload. When every acre is corn, everything needs to be planted and harvested in the same few weeks. A mix of crops spreads that out, and a calendar helps you see where the pinch points fall.
Benefits vary with soils, climate and markets, so check the numbers for your own situation with your extension office. Write down the reason for each crop in each field. Notes such as follows soybeans to ease residue or placed on well-drained ground for wheat help you later when you forget why you chose it.
How do you set up a rotation table?
Make a grid with fields down the side and years across the top. Fill in the crop for each field and year. Add a column for the previous crop, for cover crops and for notes about herbicide history. This simple table tells you at a glance what each field has had.
Then add a row for key dates each year, such as planting window, expected harvest and fall work. Keep it on paper or in a spreadsheet that is easy to update, and back it up.
- List fields and acres
- Record the crop and variety each year
- Note herbicide and fertilizer history
- Mark cover crop and tillage plans
What does crop sequence change on the calendar?
Each crop has its own planting and harvest windows, and the sequence determines how much time you have between them. Corn followed by soybeans has a different fall workload than soybeans followed by winter wheat, which has to be seeded soon after soybean harvest.
Winter wheat adds a fall seeding date that cannot slip too far. A small grain also frees ground earlier in summer, which opens options for a cover crop or a double crop. Your state extension service publishes recommended sequences for your soils.
If you also raise hay or pasture, include those fields in the same table, since a sod phase changes pest cycles, residue and fertility in a different way from row crops.
How do herbicide and pest history affect the plan?
Some herbicides carry plant-back restrictions that limit what you can plant next. The label is the law, so read the rotation restrictions before you buy and write them into your calendar. Applicator licensing varies by state, and your extension office can explain current recommendations.
Rotating crops can also interrupt insect and disease cycles, but each pest is different. Ask extension which problems on your farm are helped by rotation and how long a break is needed. Protect pollinators by following label directions on any application.
How do fertility and soil tests fit in?
Crops differ in how they use nutrients, and residue from one crop affects the next. Use soil tests and local recommendations to plan fertility for each year, and remember that nutrient management rules differ from state to state.
Update soil tests on a regular schedule so you can see trends. Record manure applications and any lime so that your plan is based on records and not memory.
How often should you revise the calendar?
Review it every fall and again before planting. Markets, weather and equipment change, and a rotation plan should bend with them without losing the long view.
Keep notes on what went wrong. A wet harvest that delayed wheat seeding, for example, may be a reason to move wheat to fields with better drainage. Your plan gets better each year because it records what actually happened.
Share the table with your lender, landlord or crop adviser if they are involved. A clear plan makes conversations about cash rent, inputs and insurance much easier.
What mistakes weaken a rotation plan?
The first mistake is planning on paper without checking drainage and field history. A field that stays wet in spring may not suit a crop with an early planting date. The second is ignoring workload, so that every field needs attention in the same week.
The third is forgetting plant-back restrictions and then boxing yourself in. Keep the herbicide record visible in your table so you can see which crops are allowed next season. Applicator licensing rules vary by state, and the label is the law.
The last is treating the plan as fixed. Prices, weather and equipment change, and a rotation can be adjusted while still keeping a long view. Write down the reason for each change so you can learn from it.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.