Deer at bird feeders: reach, corn, and the rules you may be breaking

The short answer

• A white-tailed deer rearing onto its hind legs can reach browse at 6 to 7 ft, so a feeder is only out of range with the ports at 7.5 to 8 ft and 5 ft of clear space on every side.
• Cracked corn is the strongest single attractant at typical feeder prices, and it is the first thing to drop if deer have found your yard.
• Deer feeding concentrates animals nose to nose, which is the transmission route wildlife agencies worry about with chronic wasting disease. Many states now ban or restrict feeding and baiting outright.
• Bird feeders are commonly exempt from those rules only while the feed is genuinely inaccessible to deer. A feeder deer are using can stop being a bird feeder in the eyes of the regulation.
• Overnight emptying with a bent hook and no scattered mess is a deer signature. Raccoons leave wreckage, bears leave a destroyed feeder.

You filled the feeder on Sunday evening. On Monday morning it is empty, the shepherd's hook is leaning at a new angle, and there is almost no seed on the ground. Nothing is broken. That combination, total emptying with no wreckage, is the deer signature.

Reading the scene#

Before you buy anything, confirm what you have. The three overnight emptiers leave completely different evidence.

The torn stem is a useful confirmation. Deer have no upper incisors, so they grip and tear browse, leaving a frayed end. A rabbit cuts a clean 45 degree angle. If your hostas and your feeder went in the same week, it was deer.

If you find the third column instead, stop reading here and go to bears at feeders, because that is a safety issue rather than a seed budget issue. Raccoon damage is covered in raccoons.

The reach numbers#

A white-tailed deer stands about 3 to 3.5 ft at the shoulder and browses comfortably to 6 to 7 ft when it rears onto its hind legs. Mule deer are similar, elk are considerably taller, and moose can reach heights no backyard feeder will beat.

The working rule for white-tailed and mule deer:

• Feeding ports at 7.5 to 8 ft. Not the top of the pole, the ports. The bottom of the feeder is what a deer reaches for.
• 5 ft of horizontal clearance from anything a deer can stand beside and lean around: fences, decks, retaining walls, raised beds, parked trailers.
• Measure from the highest ground within 5 ft. On a sloped yard, deer approach from uphill. A feeder that is 8 ft above the pole base can be 6 ft above the bank behind it.
• Hang from a span, not a hook. A wire or rope run between two trees at 9 ft, with the feeder hung 12 to 18 in below it, is the only arrangement most people can build that genuinely reaches the height. Shepherd's hooks top out well inside deer reach and bend under a leaning deer. Options and load limits are in poles, hooks and hangers.

Corn is what they came for#

Cracked corn is the cheapest food in the seed aisle per pound, which is why it makes up the bulk of bargain mixes, and it is the strongest deer attractant you can put in a yard short of deliberately baiting them.

The honest question is what you lose by dropping it:

• Top-tier favorite for: Blue Jay, Mourning Dove, House Sparrow, Common Grackle, Red-winged Blackbird
• Eaten readily by: Dark-eyed Junco, White-throated Sparrow, Song Sparrow, Eastern Towhee, Steller's Jay, California Scrub-Jay, European Starling
• Taken occasionally by: Northern Cardinal, Red-bellied Woodpecker, Northern Flicker

Jays, doves, juncos, sparrows and towhees will miss it. Grackles, starlings and House Sparrows will miss it more, and most people count that as a win. Nothing on that list eats only corn: every species there takes sunflower, hearts or millet as readily or more so. Corn is a convenience and a cost saving, not a nutritional requirement, and the full case for and against it is in cracked corn.

Ranked roughly by how much deer care:

1. Cracked corn and any mix built on it
2. Whole corn, milo and wheat filler
3. Black oil sunflower and hearts
4. Peanuts and suet, if they can reach them
5. Safflower and nyjer, the least interesting of the common feeder foods

Switching a deer-visited station to safflower in a hanging feeder, with nothing at all on the ground, is the cheapest experiment available. It will not defeat a deer that has already learned the location, but combined with the height it usually ends the visits within a week or two.

Why the agency asks you not to#

Feeding concentrates deer. They arrive at the same spot repeatedly, feed nose to nose, and leave saliva on shared food and on the ground. That is precisely the contact pattern that spreads chronic wasting disease, a fatal prion disease of deer, elk and moose that transmits both by direct contact and through a contaminated environment that stays infectious for a long time. Bovine tuberculosis has been tied to concentrated feeding as well.

There are further reasons agencies dislike backyard deer feeding, and they compound:

• Habituated deer lose their avoidance of roads and people, and deer-vehicle collisions rise where deer are drawn into residential areas.
• Concentrated deer bring blacklegged ticks with them, which is a direct human health issue in much of the East and upper Midwest.
• Browse pressure on your neighbors' gardens and on young trees increases.
• Sudden grain in a winter diet can cause serious digestive upset in an animal whose rumen is set up for woody browse.

Rebuilding the station#

A sequence that works, in the order to do it:

1. Take everything down for a week. Deer check a productive spot for several days. Removing the reward before you rebuild stops you testing your new setup against an animal that is already committed.
2. Clear the ground. Rake up the accumulated seed and hulls under the old position. See seed waste and mess for how much is likely to be down there.
3. Rehang high, on a span, away from launch points. Ports at 7.5 to 8 ft, 5 ft clear, measured from the highest nearby ground.
4. Change the food. No corn, no bargain mix, nothing on the ground.
5. Fill smaller. Three to five days of seed at a time, so an overnight raid costs you less and there is less to spoil. This also happens to be the anti-mold rule in moldy seed.
6. Watch for a week before adding anything back. If the deer have moved on, you can consider reinstating a low tray for juncos and doves, though in a deer neighborhood it will usually restart the problem.

In hard winter, the pressure goes up: natural browse gets scarce, and a reliable grain source becomes worth crossing a road for. If you feed through the cold months, this is the season to be strictest about height and spill, and the wider winter routine is in winter bird feeding. Where deer share the yard with squirrels and raccoons, the same pole geometry serves all three, so it is worth doing once and properly with baffles and poles.

Frequently asked questions#

How high should a bird feeder be to keep deer out?

Put the feeding ports at 7.5 to 8 ft above the ground the deer stands on, and leave 5 ft of clear space around the feeder. A white-tailed deer browses to 6 to 7 ft when it rears up, and it will stretch further than you expect for something it wants. Height alone is not enough on a slope or beside a bank, a deck or a retaining wall, because the deer simply stands on the high side. Measure from the highest ground within 5 ft of the feeder, not from the base of the pole.

What food attracts deer to bird feeders?

Cracked corn first, then any mix built on corn and millet, then sunflower. Corn is the cheapest ingredient per pound in the seed aisle, so it dominates bargain mixes, and deer will walk past better browse to get it. Safflower and nyjer are the least interesting to deer of the common feeder foods, though nothing is genuinely deer-proof once an animal has learned the location. Removing all ground feeding and switching to safflower in a hanging feeder is the cheapest test of whether food choice alone will solve it.

Is it illegal to feed deer?

In many places, yes. A large number of US states and Canadian provinces restrict or prohibit feeding and baiting deer, either statewide or inside disease management zones, and some municipalities add their own ordinances. Bird feeders are usually exempt, but the exemption is conditional: it typically requires the feed to be out of reach of deer, and some rules specify a height. If deer are visibly feeding at your feeder, you may be outside the exemption. Check your state or provincial wildlife agency before assuming.

Why do wildlife agencies discourage deer feeding?

Because feeding sites put deer in repeated close contact and leave saliva on shared food. That is the transmission pattern that matters for chronic wasting disease, a fatal prion disease of deer, elk and moose that spreads through direct contact and environmental contamination. Bovine tuberculosis has been linked to concentrated feeding as well. There are secondary reasons too: habituated deer, more deer-vehicle collisions, heavier tick loads near yards, and browse damage to gardens and young trees.

Can corn hurt deer?

It can. A deer whose gut has adapted to woody winter browse can be seriously harmed by a sudden load of high-starch grain, because the rumen chemistry shifts faster than the microbial population can adjust. That is a real and documented risk of well-meant winter corn feeding, and it is one more reason to keep grain in a feeder deer cannot reach rather than on the ground. Feed the birds, and let the deer eat what their digestive system is currently set up for.

How do I know it was deer and not raccoons?

Look at the aftermath. Deer empty a feeder cleanly and leave the hardware bent or the feeder swinging, with cloven tracks 2 to 3 in long in soft ground and pellet droppings nearby. Raccoons leave a mess: lids off, seed scattered, hoppers pulled apart, and small handprint tracks. Bears leave the feeder destroyed, the pole flattened or the whole unit missing. Browsed shrubs also give deer away, since they tear rather than cut, leaving a ragged stem end where a rabbit leaves a clean angled cut.

Sources and further reading

1. National Wildlife Health Center US Geological Survey Wildlife disease surveillance, including chronic wasting disease in cervids
2. Michigan Department of Natural Resources State of Michigan Example of a state agency regulating deer baiting and feeding, including bird feeder conditions
3. Feeding Birds Cornell Lab of Ornithology, Project FeederWatch Feeder placement and food selection background