Winter Hay Math: How Much Hay Does Your Horse Need?

Step 1: The daily number

The University of Minnesota Extension recommends that most mature horses get at least 1 percent - and ideally 1.5 to 2.5 percent - of their body weight in forage each day, and notes that horses with free access to hay will willingly eat about 2 to 2.5 percent of their body weight daily. For a working estimate, 2 percent is a reasonable planning figure: a 1,000-pound horse eats roughly 20 pounds of hay per day.

Don't have a current weight? A heart-girth-and-length tape formula gets you close - see our post on estimating your horse's weight without a scale.

Step 2: Multiply by your winter

Count the days your horse will be on hay rather than pasture - that depends on your climate, not a calendar rule. Then: daily pounds x days = total pounds. Divide by your bale weight to get a bale count. A 1,000-pound horse eating 20 pounds a day for 150 hay-feeding days needs about 3,000 pounds - sixty 50-pound bales.

Step 3: Adjust for reality

Extension guidance adds important nuance:

• Forage should make up most of the diet - at least half of the daily ration in UMN's example feeding programs, even for horses in heavier work.
• Feed each horse as an individual. Easy keepers, hard keepers, growing horses and seniors won't all match the 2 percent planning figure.
• Monitor body weight and body condition score routinely and adjust - UMN suggests a BCS between 4 and 6 as ideal, checked with your hands, not just your eyes.
• Hay varies. UMN recommends having hay laboratory-tested to identify nutrient gaps, since hay can be low in some vitamins and minerals.

Keep the numbers with the horse, in PawLine

Weight estimates, bale counts, body condition notes - they belong with the horse they describe. You can find a simple place for all of it in the PawLine app: log the tape measurement, note the hay plan, and check next month whether condition matches the math. You can find this in the PawLine app.