Best Hay for Dairy Cows: 5 Types Compared With Prices

The best hay for dairy cows in early and peak lactation is leafy alfalfa cut early, which USDA grades as Premium or Supreme when crude protein is 20% or more and NDF is 36% or less. Grass hay, oat hay and alfalfa-grass mixes fit dry cows, heifers and late-lactation cows, where less protein and more fiber are fine. A lab test is the reliable way to know which bale is “best”, because looks can mislead.

This guide ranks five common hay types for milking herds, shows what each grade means in numbers, gives dated US hay prices from USDA, and includes a calculator that compares two hays on cost per pound of protein. Readers in Canada, the UK, Europe and Australia can use the same test numbers; only the prices are US.

Best hay for dairy cows at a glance

The table sums up the five types. Protein and fiber ranges come from the USDA grading table and University of Minnesota oat data cited below. Prices are USDA averages of prices received by farmers in August 2026.

How we ranked these hay types

We ranked each hay by how well it can meet a milking cow’s needs for protein and digestible energy, then by how easy it is to buy at a known quality. The protein and fiber cut-offs come from the USDA Hay Quality Designation Guidelines, which hay market reporters use across the United States. Oat hay numbers come from University of Minnesota Extension. Prices come from the USDA NASS Agricultural Prices report for August 2026.

We did not rank by brand, seed company or region. A single type can range from excellent to poor. Penn State Extension notes that maturity at harvest is the most important factor in forage quality, ahead of the crop species itself. So a late-cut alfalfa can test worse than an early-cut grass. Use the ranking as a starting point, then buy on the lab report.

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1. Alfalfa hay: best for fresh and high-producing cows

Best for: cows in the first 100 days of lactation and herds pushing for high milk per cow.

Alfalfa is a legume. Legume protein is usually much higher than grass protein, and legume fiber digests faster, so cows can eat more of it, according to the Penn State Extension guide to forage quality. That is why alfalfa is a common base hay in high-yield dairy rations.

USDA splits alfalfa into five grades. Supreme hay has ADF under 27%, NDF under 34%, relative feed value (RFV) above 185 and crude protein above 22%. Premium sits just below: NDF 34–36% and protein 20–22%. Good alfalfa has NDF 36–40% and protein 18–20%. Fair and Utility grades follow. Many buyers set Premium as the target for milking cows and accept Good for later lactation; agree the grade in writing before you buy.

• Pros: high protein, fast digestion, high intake, easy to grade and market.
• Cons: the highest price of the common hays; leaves shatter if baled too dry; too much in a dry-cow ration adds calcium and potassium your nutritionist may want to limit.
• Facts: US alfalfa averaged $206 a ton in August 2026, up from $171 a year earlier (USDA NASS).

2. Alfalfa-grass mixed hay: best for mid-lactation cows

Best for: cows past peak, mixed herds and farms that want one hay for several groups.

A mix of alfalfa with orchardgrass, timothy or brome gives more fiber and a little less protein than pure alfalfa. Grass can fill gaps where an alfalfa stand thins out. The trade-off is that quality is harder to predict. Penn State Extension describes a University of Minnesota study where NDF ranged from 34 to 54 percent among bales in a single load of hay. In the same guide, a cored sample of an alfalfa-orchardgrass bale tested 16% crude protein while a grab sample from the same bale tested 13%.

• Pros: fits several cow groups, usually cheaper than pure alfalfa, good rumen fiber.
• Cons: big swings in quality between lots; USDA grades pure alfalfa only when it holds no more than 10% grass.
• Facts: buy each lot on a cored sample, not on color or smell.

3. Oat hay: best for mixed rations and heifers

Best for: rations that need palatable fiber, growing heifers, and farms in drier regions such as California, the Pacific Northwest and southern Australia, where oats are a common hay crop.

Chart

Oat hay protein falls as the crop matures

Crude protein, % of dry matter, by harvest stage

Oat hay quality depends almost entirely on when it is cut. University of Minnesota Extension reports that oats cut at the boot stage tested about 20.5% crude protein, compared with 14.6% at the milk stage and 11.5% at the dough stage. Yield moves the other way: the same table shows about 1.56 tons per acre at boot and 4.09 tons at dough. So growers trade protein for tonnage.

• Pros: palatable, good fiber, can be grown as a double crop, quality is high when cut early.
• Cons: protein drops fast after heading; late-cut oat hay suits dry cows more than milking cows; can carry nitrates after drought or heavy nitrogen.
• Facts: ask the seller for the cutting stage and a lab report with protein and NDF.

4. Grass hay: best for dry cows and late lactation

Best for: dry cows, bred heifers and cows near the end of lactation.

Timothy, orchardgrass, brome and ryegrass hays have more fiber and less protein than alfalfa. USDA grades grass hay on protein alone: Premium above 13%, Good 9–13%, Fair 5–9% and Utility under 5%. A Good grass hay is often all a dry cow needs.

• Pros: lower price per ton, safe bulk fiber, good for controlling body condition.
• Cons: not enough protein or energy for fresh cows on its own; mature grass hay cuts intake.
• Facts: US “other hay” (mostly grass) averaged $152 a ton in August 2026 (USDA NASS).

5. Sorghum-sudangrass hay: a backup fiber source

Best for: dry cows and heifers on farms that need summer feed in hot areas.

Sorghum-sudangrass grows fast in heat and gives a lot of tonnage. As hay it tends to be coarse, with stems that dry slowly. Fiber is high and protein is moderate, so it fits lower-demand animals. Drought-stressed or heavily fertilized sorghum can build up nitrates, so get a nitrate test before feeding. Follow your local extension advice and your veterinarian’s guidance on safe levels.

• Pros: high yield in hot weather, cheap fiber.
• Cons: slow drying, nitrate risk, low intake by high-producing cows.
• Facts: USDA does not publish a separate price for it; it falls under “other hay”.

What hay grades mean in numbers

Hay labs report three main numbers. Neutral detergent fiber (NDF) is total fiber; higher NDF means cows eat less. Acid detergent fiber (ADF) is the least digestible part; higher ADF means lower digestibility. Crude protein (CP) comes from total nitrogen. Penn State Extension explains that energy values such as TDN and net energy of lactation, and indexes such as RFV, are calculated from NDF and ADF.

USDA describes RFV as an index that combines digestibility and intake potential for ranking hay. The higher the number, the better. The chart shows the NDF range for each USDA alfalfa grade.

Chart

NDF range for each USDA alfalfa grade

Neutral detergent fiber, % of dry matter; Supreme and Utility shown with the nearest limit

Hay prices for dairy farms

Prices below are USDA NASS averages of prices received by farmers, all qualities, in dollars per ton. They are not dealer asks or auction results. The USDA NASS Agricultural Prices report for September 2026 put the August 2026 all-hay price at $190 a ton, up $29 from August 2025. Alfalfa averaged $206 and other hay $152.

Chart

US hay prices by type

US$ per ton, price received by farmers

Prices differ a lot by state. In August 2026, alfalfa averaged $151 a ton in Wisconsin, $230 in Texas, $235 in California and $280 in Pennsylvania. Premium and Supreme alfalfa, which dairies buy, cost more: USDA’s weighted price for the five biggest milk states (California, Idaho, New York, Texas and Wisconsin) was $243 a ton. New York averaged $335, and Pennsylvania, which is outside that five-state group, $360. Freight is extra and can be a big share of the delivered cost.

A higher price does not always mean a worse deal. The Penn State guide shows a Cornell PRO-DAIRY example where the high-quality hay ration cost $0.11 less per cow per day than the medium one, because it replaced more grain. That example used old prices, so treat it as a principle, not a current figure. The calculator below lets you test your own quotes.

Chart

Alfalfa hay price by state, August 2026

US$ per ton, price received by farmers, all qualities, selected dairy states

Compare two hays on cost per pound of protein

Price per ton tells only part of the story. A cheaper hay with less protein may need more purchased protein to balance the ration. Enter the price, dry matter and protein of two hays from their lab reports. The tool shows the cost per pound of crude protein and per ton of dry matter. It does not count energy, fiber digestibility or freight, so use it to shortlist offers, then check the full ration with your nutritionist.

Try the numbers for your own farm below.

How to choose the best hay for your herd

1. Group your cows. Fresh and high-producing cows need the top hay. Dry cows and heifers can use cheaper grass or mixed hay.
2. Get a cored sample. Take cores from many bales in each lot with a hay probe. Grab samples from one bale can be far off.
3. Read the lab report. Look at CP, NDF, ADF and RFV or RFQ first. For fresh and high-producing cows, aim for USDA Premium or Supreme alfalfa; Good alfalfa can suit later lactation.
4. Check moisture and smell. Hot, dusty or musty bales can carry molds. Do not feed them to milking cows.
5. Compare cost per nutrient. Use the calculator above, then add freight.
6. Watch the herd. Track milk, butterfat, manure and body condition for two weeks after a hay change.

Lab results and ration changes are advice-grade decisions. Check with your dairy nutritionist or veterinarian before a large switch, and follow any feed rules in your area.

Growing and storing your own dairy hay

If you grow hay, the cutting date matters most. Penn State Extension notes that forage quality can drop measurably every two or three days as plants mature, and that rain damage on cut hay is very destructive to quality. Harvest losses come mainly from lost leaves.

Moisture at baling is the next risk. Ohio State University Extension advises baling small rectangular bales at 20% moisture or less and large round or square bales under 18%. For its national forage totals, USDA NASS converts haylage to a dry-hay basis of 13% moisture. Agriculture Victoria recommends no more than 18% for small squares, about 14–16% for large rounds and 12–14% for large squares. Wet hay heats, loses feed value and can catch fire.

Ohio State lists warning signs: a caramel or burning smell, visible vapor and bales that feel hot. At 175°F it advises calling the fire department. Propionic acid preservatives can help when baling above 20% moisture; follow the product label for rates. Store bales off the ground and under cover where you can.

Satellite maps can help plan cutting. Farmonaut shows vegetation index maps of your hay and pasture fields through the season, so you can see which fields are growing well and which lag behind. It does not measure protein; you still need the lab test.

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Matching hay to lactation stage

Hay needs change through the year for each cow.

• Fresh cows, first 3 weeks: palatable, leafy hay to keep intake up after calving. Premium alfalfa or a top-quality mix.
• Early and peak lactation: the highest-protein, lowest-NDF hay you have, within a ration balanced for energy and fiber.
• Mid and late lactation: Good alfalfa or mixed hay. Protein needs fall as milk yield falls.
• Dry cows: grass or late-cut oat hay to hold body condition. Close-up rations need a nutritionist’s help with minerals.
• Heifers: mixed or oat hay; growing heifers need more protein than dry cows.

Breed matters less than stage and yield. Breeds differ in body size and intake, but the hay choice still follows stage and milk yield. Your milk records tell you more than the breed label does.

For ideas on cutting the footprint of the whole dairy, see our post on sustainable dairy farming hacks.

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FAQ

What is the best hay for dairy cows in milk?

Leafy alfalfa cut early, graded Premium or Supreme by USDA (crude protein 20% or more, NDF 36% or less), is the usual choice for fresh and high-producing cows. Base the final choice on a lab test and your nutritionist’s ration.

Is grass hay good for dairy cows?

Yes, for dry cows, heifers and late-lactation cows. USDA grades grass hay as Premium when crude protein is above 13%. On its own it rarely has enough protein and energy for cows at peak milk.

Is oat hay good for milk production?

It can be when cut early. University of Minnesota Extension reports about 20.5% protein at the boot stage but only 11.5% at the dough stage. Late-cut oat hay fits dry cows better than milking cows.

How much does dairy-quality hay cost?

USDA NASS put the US average alfalfa price at $206 a ton in August 2026. Premium and Supreme alfalfa averaged $243 a ton in the five biggest milk states. These are prices received by farmers, before freight.

What moisture should hay be baled at?

Ohio State advises 20% or less for small square bales and under 18% for large bales. Agriculture Victoria recommends lower targets for large bales. Check your local extension guide.

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