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Harvest, Storage & Post-Harvest TimingGrain Harvest and Storage Calendar
Good grain storage starts weeks before harvest and runs through the next summer. A calendar helps you keep each stage in order.
Key points
- Clean and repair bins before harvest.
- Use extension target moistures for your crop and storage length.
- Cool grain early and check bins on a regular schedule.
- Never enter a bin with crusted or bridged grain.
- Keep a log of each load, bin and inspection.
What should happen before harvest?
Clean bins thoroughly, removing old grain, fines and trash that harbor insects and mold. Inspect the structure for leaks, check fans, ducts, augers and moisture meters and fix problems before you need them. Cleaning and repair are easier before grain arrives.
Extension grain storage guides, such as those from the University of Nebraska-Lincoln, walk through a pre-harvest bin checklist. Use one for your type of bin.
Fix bin leaks before harvest, since water entering a bin is one of the quickest ways to lose grain. Also check that the bin has a safe way in and out and that everyone who works around it knows the entry rules.
How do you time harvest?
Harvest timing depends on crop maturity and moisture, not only the date. Corn and soybeans dry in the field, and weather decides how fast. The USDA NASS publishes usual planting and harvesting dates and weekly crop progress, which show the typical range for your state and how the current season compares. Check the latest edition for your state.
For example, if your fields are drying more slowly than usual in a cool, wet fall, you may have to dry more grain or accept a later harvest. Plan fuel, labor and bin space for that possibility. Do not harvest into a bin that is still warm or wet from a previous load.
- Check moisture across fields and loads
- Look at forecast and field drying
- Plan drying capacity
- Track what goes into each bin
What moisture should grain have at storage?
The right moisture depends on the crop, how long it will be stored and the season. Wetter grain can be held for a short time in cool weather, but long storage and warm months need drier grain. Check your state extension for target moistures and do not guess.
Check your moisture meter against a known source, such as the elevator, each season.
If you are not sure which target to use, call your county extension office or elevator. A short phone call costs far less than a bin of heated grain.
How do you manage grain after it is in the bin?
Cool the grain as soon as outside temperatures allow, using aeration fans as extension guidance describes. Level or core the grain so fines and spoilage-prone grain do not collect in the center. Check temperature at several places and look for hot spots.
Inspect regularly, for example every couple of weeks in winter and more often when weather changes. Look for crusting, odors, insects and condensation on the roof or walls.
Keep samples from each field and bin. If a problem comes up later, a sample from the time of binning helps you work out what happened and who to ask.
What about winter and spring?
Winter checks aim to catch condensation and crusting early. In spring, rising temperatures warm the grain, so many problems begin then. Decide before warm weather whether you will sell, move or re-dry grain.
Never enter a bin with crusted or bridged grain, or when grain is moving. Entrapment is a serious hazard, and extension and farm safety groups provide guidance.
Watch the roof area of a bin for condensation, which often forms where warm grain meets cold air. Running fans at the right time, based on extension advice, can help reduce it.
How do pests and insurance fit into the plan?
Stored grain insects usually enter with the grain or from old residues. Sanitation and cooling are the main preventive steps. If you see insects, ask your extension office or a licensed applicator about current options, and follow the label. Pesticide rules vary by state.
For stored grain that is part of a crop insurance claim or loan, check requirements with your insurance agent, USDA RMA or your local FSA office. Keep the phone number of your extension office and a licensed applicator handy before you need them.
What records should you keep?
Record the date and moisture of each load, the bin, the fan hours and each inspection. A clear log helps spot problems early and shows buyers and lenders how the grain was handled.
Review it after the season and update the calendar.
A year of notes shows you how much drying capacity and bin space you really used, which is useful when you plan upgrades or talk to a lender.
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.