Flax Planting Calendar

Flax is a small-seeded crop that is grown mostly in the northern Plains. It goes in after small grains and before the warmest weather arrives.

Key points

Flax is a cool-season crop planted in spring, mostly in the northern Plains.
NASS lists most North Dakota planting between early May and early June.
Small seed means shallow placement and a firm seedbed.
Confirm markets and rotation intervals with local sources.

When is flax planted?

Flax is a cool-season crop, and many northern growers plant it in the spring after small grains and in the same general period as spring wheat and canola. Seedlings are fairly tolerant of cool soil but can be hurt by a hard freeze after emergence, so the date should balance early moisture against frost risk. Ask your state extension flax guide about the best window.

If you are planning from scratch, check your average last spring frost, your soil temperature and your seedbed. A good seedbed matters because flax has small seeds and weak seedlings.

What is the usual planting window for flax?

Most flax in the United States is grown in North Dakota. In the October 2010 edition of USDA NASS usual planting dates, flaxseed in North Dakota shows most active planting from about May 7 to June 3, with harvest beginning in mid to late August. That is a regional average, and a particular year can be earlier or later.

Because the NASS table is the only federal source here, extension guides from North Dakota State University and neighboring states are the best next step. They often add details about varieties and seeding practices.

North Dakota is the main flax state
Most planting falls between early May and early June
Check local guides for your county

Why do small seeds change planting decisions?

Flax seed is small, so depth control is critical. Seed that goes in too deep can struggle to emerge, particularly in crusting soils. A firm seedbed helps place seed evenly at a shallow depth. Check the planter after the first few passes, then check again after rain.

Flax is also a weak competitor with weeds early on. A clean field, a good rotation and a weed plan before seeding make a big difference. Ask your extension weed specialist what options exist in your state.

How does rotation fit with flax?

Flax is typically grown in rotation with small grains and other crops. Extension programs often advise a rotation gap between flax crops in the same field because of disease concerns, and some suggest waiting after certain crops. Your local number depends on your region, so ask extension rather than copying a generic figure.

Flax straw is tough and slow to break down, and it can cause challenges at harvest and for the next crop. Ask extension about residue management for your system.

What markets and uses should you plan around?

Flaxseed is used for oil and for food and feed. Some markets are specialty, and buyers may have specific requirements for variety, quality and delivery. Talk to your buyer before you plant. Check whether there are contract requirements that affect variety or planting date.

Flax is not as widely grown as corn or wheat, so you may need to ask around for equipment, storage and marketing options. Neighbors and extension staff are good starting points.

What should you check about pests and rules?

Disease and insect pressure vary, and extension programs publish current guides. Any pesticide use follows the label, including pre-harvest intervals, and applicator licensing rules vary by state. Protect pollinators by following label instructions about timing.

Crop insurance sets final planting dates by county. Check with your agent and USDA Risk Management Agency materials before you decide on a late plan.

How can you build a flax plan around frost and soil?

Start with the average last spring frost date from your local weather service office. Flax seedlings can take some cool weather, but a hard freeze after emergence can set the crop back, so avoid emerging into a forecast freeze. Check the soil: a seedbed that is workable, firm and not saturated is a better sign than the date on the calendar.

Then think about the other work on your farm. Flax often follows small grain planting, so your window may overlap with spring wheat, barley and canola. If a wet spring squeezes your schedule, decide ahead of time which fields get priority and what you will do if flax planting slips into June.

The usual North Dakota window from NASS runs from early May to early June, but that is an average across many farms and years. A late-planted field has less time for the crop to mature before fall, so ask extension about varieties and what late planting does in your area. Write down your actual planting date, emergence, flowering and harvest dates each year so the next plan starts from your own history.

Avoid emerging into a forecast freeze
Plan which fields get priority in a wet spring
Record planting, flowering and harvest dates

Timing at a glance

Timing ranges for this topic
Item	Window	Caveat
Flaxseed, North Dakota	Most active planting from about May 7 to June 3	Usual dates describe typical field activity in that state, not a safe date for your farm. Check your own last frost date, soil temperature and your state extension guide.

When to get local help: Ask your county extension office, a certified crop adviser or your buyer about flax varieties and local timing.

Sources and further reading

Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.

More in Field Crops, Grains & Oilseeds

← Sunflower Planting Calendar Safflower Planting Calendar →