Home / Guides / Field Crops, Grains & Oilseeds
Field Crops, Grains & OilseedsBuckwheat Planting Calendar
Buckwheat is not a grass or a true cereal, and it behaves differently from the small grains it is often grouped with. It grows quickly, hates frost and does poorly in heat during flowering.
Key points
- Buckwheat is frost-tender and goes in after your last spring frost.
- No federal planting table exists, so use local guidance and your own frost dates.
- Hot weather during flowering can reduce seed set.
- If using it as a cover crop, terminate before mature seed forms.
What kind of crop is buckwheat?
Buckwheat is a broadleaf plant that produces seed used as a grain, though it is not related to wheat. It is grown for food, for cover and as a nectar source for bees. Growers like it because it can complete its life cycle in a short season, which makes it useful as a summer cover crop and as a late-planted option when other crops have failed.
It is a small acreage crop, so the USDA NASS usual planting dates publication does not list it. There is no federal table to quote, which means you should rely on soil, frost dates and the guidance of a land-grant extension office near you.
When should you plant buckwheat?
Buckwheat is killed by frost at any stage, so it should be planted after the last spring frost has passed and the soil has warmed. It germinates quickly in warm soil, and many extension sources describe a short season from planting to maturity. Because it is frost-tender, the planting date is controlled mostly by your last frost date and your first fall frost date.
For example, if your last spring frost usually falls in mid May and your first fall frost in early October, you have a long summer window in which to plant and still finish the crop. Ask your extension agent what range of dates local growers use and how long local varieties take to mature.
- Plant after the last spring frost
- Buckwheat is frost-tender at every stage
- Count the days to your first fall frost
How does heat affect flowering and seed set?
Buckwheat flowers over a long period, and hot, dry weather during flowering can reduce seed set. That is a reason growers sometimes aim for flowering to happen during a cooler part of the season. Planting date therefore changes more than when you harvest. It changes the weather the crop flowers in.
If you plant for grain, think about where flowering will fall relative to the hottest part of your summer. If you plant for cover or bees, seed set matters less, and you may care more about how quickly the crop covers the soil and when it flowers.
What seedbed and fertility choices matter?
Buckwheat tolerates poorer soil than many crops and does not need heavy fertility. Too much nitrogen can encourage vegetative growth and lodging. A soil test helps you see what the field actually needs, and nutrient management rules vary by state. Do not guess at fertilizer or lime, and ask extension for local recommendations.
Because the seed is fairly large and the seedlings are vigorous, buckwheat can establish quickly and shade out weeds. Even so, a clean seedbed and a plan for weeds make the stand more reliable.
How do you use buckwheat as a cover crop?
As a summer cover crop, buckwheat can fill a gap between spring and fall crops. It grows fast, suppresses some weeds and flowers quickly, which attracts beneficial insects and pollinators. Terminate it before it sets seed if you do not want volunteers in the next crop, since it can reseed itself.
Timing the termination matters. Mowing or incorporating after flowering starts but before mature seed forms is a common approach, and your extension office can tell you what works in your area. Any herbicide use follows the label.
What should you check about markets, harvest and rules?
If you plan to sell buckwheat, talk to buyers first. Markets are small and specialized, and requirements for quality, variety and delivery vary. Harvest can be tricky because the plant ripens unevenly, and shattering losses are a concern. Ask extension about harvest timing and equipment settings.
If you grow buckwheat near honey bee operations, talk to your beekeeper neighbors, and follow label directions on any pest control product to protect pollinators. Check crop insurance rules with your agent, since buckwheat may not be covered everywhere.
What mistakes should you avoid with buckwheat?
Planting too early and losing the crop to frost is the biggest. The second is letting a cover crop go to seed and creating a weed problem. The third is using it as a quick fix without checking for markets or equipment. Write down planting date, stand, flowering date and result each season to learn what works on your farm.
- Planting before the last frost
- Letting a cover crop set seed
- Not lining up a market for grain
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.