First cut hay can be perfectly good for horses, but its quality varies widely depending on when it was harvested, how it was dried, and what grasses are in the field. There’s no rule that says first cutting is automatically better or worse than later cuttings. What matters far more is the maturity of the plant at harvest and how the hay was stored afterward.
Why First Cut Has a Reputation
First cutting is harvested in late spring or early summer, after the longest growing period of the year. That extra time in the field means the plants are often more mature, with thicker stems and more seed heads compared to second or third cuttings. Mature plants contain more structural fiber (lignin and cellulose), which makes the hay coarser and sometimes less digestible. This is where the reputation comes from: first cut hay tends to be stemmier, and horses may sort through it, eating the leafy parts and leaving the rest.
But maturity at harvest is the real variable. A first cutting taken early, before the grasses fully head out, can be just as soft and nutritious as a later cutting. A first cutting left standing too long will be tough and woody. The calendar date of the cut matters less than the growth stage of the plants when the mower hits the field.
Nutritional Profile of First Cut Hay
Grass hays typically fall between 8% and 14% crude protein, regardless of cutting number. First cut hay that was harvested at a reasonable maturity stage will land comfortably in that range, which meets the protein needs of most adult horses at maintenance. Horses in heavy work, lactating mares, and growing foals need higher protein and may do better with a richer hay or a supplemented diet.
Fiber content is where first cut hay can differ from later cuttings. A useful measure is acid detergent fiber (ADF), which reflects how digestible the hay is. Values below 45% are generally suitable for horses. Above 65%, horses won’t readily eat it. First cut hay that was allowed to get overly mature may push toward the higher end of that range, meaning the horse extracts less nutrition from each mouthful and may need to eat more to maintain weight. The only reliable way to know where your hay falls is to send a sample for a forage analysis, which typically costs $15 to $30 through a local extension lab.
Sugar Levels and Metabolic Horses
If you’re managing a horse with metabolic concerns like insulin resistance or a history of laminitis, you may have heard that first cut hay is higher in sugar. This is one of the most persistent assumptions in horse nutrition, and it’s not reliably true. Oregon State University’s extension service states plainly that harvest number and growth stage are “unreliable indicators of sugar concentration.” Sugar levels in hay are influenced by sunlight, temperature, plant species, and time of day at cutting, not by whether it’s the first or fourth harvest of the season.
For metabolic horses, the standard recommendation from the American College of Veterinary Internal Medicine is to keep nonstructural carbohydrates (the combined total of water-soluble carbohydrates and starch) below 10% of the hay’s dry matter. You cannot determine this by looking at or smelling the hay. A lab test is the only way to confirm sugar and starch levels, and this applies equally to first, second, or third cuttings.
Moisture, Mold, and Storage Risks
First cut hay faces a unique challenge: it’s often harvested during a wetter time of year, when afternoon rain showers and heavy dew can interrupt the drying process. If hay is baled at too high a moisture level, mold becomes a serious concern. Moldy hay can cause respiratory problems in horses and, in severe cases, produce toxins.
The ideal moisture content for baled hay is between 10% and 15%. At 16% to 20%, mold can develop without a preservative. Above 21%, mold is likely, and internal heating can create a fire risk in stored bales. When evaluating first cut hay, check for a few things before buying:
- Color: Good hay is green to light green. Brown or dark patches suggest weather damage or heating.
- Smell: It should smell fresh and slightly sweet, not musty, sour, or like tobacco.
- Dust: Shake a flake apart. A visible dust cloud often indicates mold spores, which are harmful to equine lungs.
- Texture: Leaves should still be attached to stems. If the hay crumbles to dust when handled, it was baled too dry and has lost nutritional value.
Because first cut is more vulnerable to rain during curing, it’s worth being especially attentive to these signs. A well-cured first cutting stored in a dry barn is perfectly safe. A first cutting that got rained on in the windrow and was baled damp is not worth the risk at any price.
When First Cut Works Well
For easy keepers, or horses that tend to gain weight quickly, a slightly more mature first cut hay can actually be an advantage. The higher fiber and lower calorie density means the horse can eat a reasonable volume without consuming excess energy. This keeps the gut full and the horse busy chewing, which is important for both digestive health and behavior, while managing calorie intake.
Horses spend roughly 7 to 8 hours a day consuming hay when given free access. A stemmier first cut may extend that chewing time slightly compared to a softer, leafier hay, which can be a benefit for stall-kept horses prone to boredom or gastric ulcers.
When Later Cuttings May Be a Better Fit
Second and third cuttings are typically finer-stemmed and leafier because the regrowth period is shorter, so the plants don’t reach the same level of maturity. This often translates to higher digestibility and sometimes higher protein. For hard-working sport horses, underweight horses, or growing youngsters that need more calories per pound of hay, a later cutting may deliver more nutritional bang.
That said, a premium second cutting costs more in most markets. If your horse is a healthy adult at maintenance, paying extra for softer hay may not offer any meaningful benefit. The coarser first cut, assuming it passes a visual and smell inspection and ideally a lab analysis, does the job just fine.
The Bottom Line on Cutting Number
Cutting number is a rough shorthand, not a quality grade. A well-harvested, properly cured first cutting can be nutritionally equivalent to a later cutting. A poorly timed or rain-damaged second cutting can be worse than a good first cut. The factors that actually determine hay quality are plant maturity at harvest, species mix in the field, curing conditions, moisture at baling, and storage environment. If you want certainty, test the hay. A forage analysis will tell you more in one page than any label claiming “premium second cut” ever could.