Do Deer Eat Hay?

Updated on September 7, 2026. Hay is a farm-forage problem, not a shade-bed plant. Numbers below wear the extension or DNR sheet they came from.

Yes. Deer eat hay — standing alfalfa and clover first, then the bales you stacked for the cows. That is not permission to dump a square bale in the woods in February. Wisconsin DNR tells the public that corn, alfalfa, and other handouts are not a white-tailed deer’s winter diet and that even a single feeding can trigger rumen acidosis. Minnesota DNR’s hay-storage sheet treats scattered round bales as an open invitation. Two different problems: a crop the herd wants, and a winter handout that can fill a rumen without feeding the animal.

This page is the hay answer. Fresh lawn and pasture grass live on do deer eat grass. Kitchen-garden tops are carrots. Wild browse is on what deer eat. The rest of the planting list is the deer-proof garden hub.

Three different hay problems

1. Standing hay. From green-up through the last cutting, deer graze the live crop. They take legumes — alfalfa and clover — and leave more of the grass. A 1954 Pennsylvania note that Hall and Stout still cite is the field picture: deer nipped the tops out of clover and alfalfa and left the grasses. That is why a pure alfalfa field next to a woodlot can look mowed at dusk while the orchardgrass strip still stands. Minnesota Extension: in farm country, crops such as corn, soybeans, alfalfa, or grain can make up as much as 78 percent of a deer’s diet.
2. Stored bales. After you cut and wrap, an uncovered round bale is a feeder. Iowa State lists stored livestock feed as a deer-damage category, alongside corn and soybeans. A doe works the shoulder of a bale the way she works a hosta crown: grab, tear, step, repeat. Minnesota DNR’s geometry is the part most hay pages skip: half the volume of a 5-foot bale is in that outer eight inches. Weather plus deer on an uncovered bale sitting on sod is the part of the bale you actually sell.
3. A winter pile you put out “to help.” That is the one that kills deer with a full stomach. Once the rumen has shifted to woody browse, the microbes that ferment leafy forage are down. Wisconsin DNR’s winter-feeding sheet: do not feed hay; the fiber type cannot be broken down readily, and deer can pack a rumen with hay and still starve. Their public winter notice names alfalfa in the same breath as corn. Pennsylvania Game Commission’s rumen-acidosis page is mostly grain overload — corn, wheat, barley — lactic acid, pH at 5 or lower, death in 24–72 hours. Hay is the fiber-fermentation failure. Both start with a well-meaning pile. Both concentrate deer on chronic wasting disease ground.

Farmed deer are a separate system, transitioned onto hay the way a dairy herd is. Wild white-tailed deer in a February yard are not. How the rumen works is on the deer digestive system.

What they eat, and when

Alfalfa is the magnet. Leafy second- and third-cutting bales beat stemmy first-cutting, which is why Minnesota DNR tells you to put the cheap cutting on the bottom of the stack. Timothy is more palatable than orchardgrass in the Penn State plots. Mixed grass hay still gets hit when snow covers browse; it is just not the first choice.

Timing follows the farm calendar. Spring green-up is the worst on standing alfalfa because fat reserves are lowest — Minnesota Extension’s spring-damage note. Summer cuttings get night grazing along the wooded edge. After freeze-up, the raid shifts to bales left in the field, hay rings, and the stack by the barn. Dawn and dusk still match deer feeding times. Mule deer in Western alfalfa country run the same preference. The plant does not change. The pressure does.

Hay does not smell like a spilled apple crate. It is calories sitting still. Once a family finds the stack, they return — the same circuit as apples and fall pumpkins, just in a livestock lot.

Deer damage vs rabbit damage

Iowa State: deer leave jagged, torn edges because they have no upper incisors. Rabbits leave a clean 45-degree clip.

• Deer on a standing field: ragged tops, a browse line you can see from the road, heart-shaped hoof prints in the headland, oval pellet piles. Neighboring grass left standing while the alfalfa is scalped.
• Deer on a bale: shredded net wrap, pulled flakes, tracks packed around the base. Upper bales in a proper stack are often untouched because they sit out of reach.
• Rabbit: clean clips on young stems close to the soil, pea-sized droppings. They nibble loose scatter. They do not open a 1,200-pound round bale. Rabbit tactics live on how to keep rabbits out of the garden.

If you only have clean low cuts and no hoof prints, stop blaming deer. If the alfalfa looks mowed and the wrap is in ribbons, it is deer — the same torn-edge pattern as hostas, on a forage crop.

Region

Dairy-and-hay belt: Pennsylvania (the Hall and Stout plots), New York, Ohio, Michigan, Wisconsin, Minnesota, Iowa. Hunt context, not a name-swap: Pennsylvania deer hunting and Wisconsin deer hunting. Cornell’s New York note is the legal one suburban people miss: feeding wild deer is illegal there. Wisconsin DNR asks the public not to feed even where it is not a ticket. Minnesota’s hay-storage PDF is written for the Brainerd-to-prairie farm, not a hosta bed.

What works

• A real hay yard. Minnesota DNR: woven-wire hay yards eliminate deer damage to stored forage. Penn State’s conventional deer barrier on fruit ground is 8-foot woven wire kept tight to the ground. Iowa State wants the same 8-foot passive fence on farm-scale exclusion. Layouts: how to keep deer out of garden beds. Jump physics: how high a deer can jump. Crop-scale fencing: how farmers keep deer away.
• Stack like the DNR sheet, not like a pyramid on sod. Two high on end, third bale as a cap. Gravel, pallets, logs, or tires under the bottom row. First-cutting alfalfa on the bottom; leafy second- and third-cutting on top, out of reach. Tarp or geotextile on top, ends open for ventilation, corral panels or orange diamond fencing on the ends. Minnesota: barn or pole-building storage virtually eliminates deer damage and cuts dry-matter loss from about 40% outside on sod to about 5% in the barn.
• Stop leaving bales scattered in the field. Once they freeze to the ground, you cannot protect what is left. The Minnesota sheet’s snow-field photo is the damage, not a storage plan.
• Seed orchardgrass into the alfalfa if you cannot fence the field. Penn State’s unprotected plots: mixes with 25–75% orchardgrass, or 50% timothy, returned more money than pure alfalfa because deer preferred the legume. Quality drops as the grass share rises. That is the trade.
• Hunt the property. Iowa State’s first management line on farm deer damage is harvest of adult females. Special depredation tags exist when regular seasons do not move the needle.

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What does not

• Hand-feeding hay “so they don’t starve.” Minnesota Extension: feeding can harm or kill deer because the rumen is not set up for a high-energy dump, and it concentrates animals on your property. Wisconsin DNR: even one feeding can cause rumen acidosis; feeding also pulls deer out of winter cover. The backyard argument is on what to feed deer in your backyard. Winter specifically: what to feed deer in the winter. This page’s job is hay. Do not dump hay.
• A sacrificial bale to “draw them off the garden.” That trains the herd to the farmstead. Once the circuit includes your stack, they will also hit the hostas and the carrot row.
• Assuming grass hay is deer-proof. Penn State still lost 7% on pure orchardgrass. They prefer alfalfa. They will still eat grass hay when browse is under snow. See do deer eat grass.
• A 4-foot decorative fence around a hay lot. They will jump it. Cornell: four feet only helps when the enclosure is small and fully closed.
• Bread, corn, or “deer mix” poured on the same pile. Grain overload is the acidosis PGC describes. Bread is on can deer eat bread. If you want deer food on your own land in season, plant a plot — best food plot for deer — do not run a winter soup kitchen. Cheap-feed ideas belong on inexpensive ways to feed deer; most of them are still a bad idea.

Three better bets than a hay dump

1. Grass, especially orchardgrass-heavy mixes — Penn State: 7% yield loss versus 54% on pure alfalfa. Still fence the stack.
2. Tomatoes — Iowa State: seldom damaged. They will sample ripe fruit. They prefer an alfalfa crown to a hairy tomato vine.
3. Lavender and other strong herbs — UConn “rarely damaged,” useful as a garden border, useless as cow feed. Onions and ornamental alliums belong here too; see deer-resistant bulbs.

Related forage and fruit pages already live: carrots (tops first), apples, strawberries. Plant lists: deer-resistant annuals and deer-resistant perennials.

FAQ

Will deer eat hay bales in winter?

Yes. Uncovered round bales left in a snow field or stacked on sod are a night feeder. Minnesota DNR wrote a two-page sheet because that pattern is common. Eating the bale and being fed the bale are different. They will eat it. You should still not put it out for them.

Can hay kill a deer?

Yes, as a sudden winter handout. Wisconsin DNR: do not feed hay; deer can die with a rumen full of it because the fiber does not ferment once the winter microbes have taken over. Alfalfa handouts sit in the same warning as corn. Classic rumen acidosis (PGC) is mostly grain. Either way, the pile is the problem. Captive deer transitioned onto hay are not the same case.

Do deer prefer alfalfa hay or grass hay?

Alfalfa, then timothy, then orchardgrass, in that order, on the Penn State plots. Leafy second- and third-cutting bales beat stemmy first-cutting, which is why the quality bales belong on top of the stack, out of muzzle range.

How do I keep deer out of stored hay without fencing the whole farm?

Fence the hay yard, not the county. Stack two-high with a cap, quality hay on top, tarp, panels on the ends. Move bales into a pole barn if you can. Mix orchardgrass into the next seeding if the standing field is the loss. Hunt adult does. A soap bar on a string is not a storage plan.

Sources

• Hall, M.H. and R.C. Stout. 1999. Deer damage to alfalfa and mixtures with timothy or orchardgrass. Journal of Range Management 52(5):515–518
• Minnesota DNR Wildlife Damage — Hay Storage: Effective Ways to Minimize Wildlife Damage
• Wisconsin DNR — Avoid feeding deer as cold weather continues
• Wisconsin DNR — Winter deer feeding
• Iowa State Extension — White-tailed Deer: Damage Management
• Cornell IPM — Deer
• University of Minnesota Extension — White-tailed deer damage
• Pennsylvania Game Commission — Rumen acidosis
• Michigan State University Extension — Supplemental deer feeding
• Penn State Extension — White-tailed Deer in Home Fruit Plantings
• Iowa State — Susceptibility of Plants to Deer Damage (Rutgers / Cornell / Michigan State compile; last reviewed July 2022)

This article is part of the Deer-Proof Garden Guide — plant-by-plant answers, resistant planting lists, and the deterrents that actually work. White-tailed deer biology: white-tailed deer. Pest context: deer as pests. Organic sprays: which organic deer repellents actually work.