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If a bison charges you in Yellowstone, immediately walk or run away; do not stand your ground. If it follows, use bear spray while continuing to move away, then seek cover behind a nearby tree or car. If a bison knocks you down, focus first on getting clear of the animal. Yellowstone’s official guidance does not set out a bison-specific first-aid procedure for someone who has been struck or injured, so seek appropriate emergency assistance once you are out of immediate danger.
Bison are not slow, harmless scenery. Yellowstone says they can run three times faster than humans and have injured more people in the park than any other animal. The safest encounter is one you prevent by keeping your distance, recognizing warning behavior and leaving before the animal has to decide whether you are a threat.
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What to do if a bison starts charging
- Leave immediately. Walk or run away from the bison. Yellowstone National Park’s guidance specifically says not to stand your ground. Your goal is to increase distance, not to test whether the animal is bluffing.
- If it follows, use bear spray while retreating. Keep moving away as you use it; do not stop to approach or confront the animal. Yellowstone mentions bear spray as an option when a bison follows, not as a reason to get closer or as a guarantee that the animal will stop.
- Get behind cover. Move behind a nearby tree or car if one is available, continuing to create distance from the bison. Cover can put a solid object between you and the animal while you leave the immediate encounter.
These are Yellowstone National Park Service (NPS) instructions for bison encounters in the park. They are not a universal rule for every location where bison live; follow the land manager’s guidance where you are. If you are outside Yellowstone, check the local agency’s current wildlife-safety directions rather than assuming that every park uses identical distances or procedures.
Why the response is to move away
Yellowstone says bison can run three times faster than humans. Trying to stand your ground or relying on being able to outrun one is not a safe plan. The practical priority is to get away from the animal and toward cover if it pursues you. The instruction is different from advice often associated with a charging bear: do not import bear-specific guidance into a bison encounter. Yellowstone’s bison direction is to walk or run away rather than remain in place.
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A charge may be sudden, but the safest response is still simple and decisive. Do not pause to take a photograph, wait for another person to interpret the behavior, or move closer to see whether the bison turns. Start retreating as soon as the animal approaches or displays a warning sign.
How to avoid a charge before it happens
Distance is the most useful prevention measure. Yellowstone NPS tells visitors to remain at least 25 yards (23 meters) from bison and never approach one for a photograph. That is a minimum, not an invitation to stand exactly 25 yards away while the animal is moving toward you. If a bison closes the gap, back away or turn around and go the other way as needed.
Keep the same margin when an animal appears calm. A bison can change direction quickly, and a person absorbed in a phone or camera may not notice the distance disappearing. Do not edge forward for a better angle, surround the animal, block its route or encourage other visitors to come closer. Give it room to move without passing through your group.
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- Bluff charging
- Head bobbing while staring
- Pawing the ground
- Bellowing
- Raising the tail
These behaviors are a reason to increase distance immediately, even if the animal stops short. Chris Geremia, Yellowstone’s senior bison biologist, summarized the park’s advice in a June 29, 2020 NPS release: “To be safe around bison, stay at least 25 yards away, move away if they approach, and run away or find cover if they charge.” The same statement describes aggressive displays as pawing the ground, snorting, bobbing the head, bellowing and raising the tail.
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Practical distance habits
- Check your distance before stopping for a photograph, then check it again if the bison walks, turns or follows.
- Keep children and companions with you while you retreat; do not send someone closer to distract the animal or retrieve a dropped item.
- Leave a clear path for the bison. A crowd that presses in from several directions can make an encounter more dangerous.
- Turn around early. You do not need to wait for a dramatic charge to justify leaving.
The 25-yard rule is specifically Yellowstone NPS guidance. Bison also occur on other public lands, private ranches and wildlife areas, where signs or officials may set different requirements. Use the rules posted by the land manager for that location.
If a bison knocks you down
First, get clear of the bison if you can do so without moving back toward it. The priority is to escape the immediate danger, not to remain near the animal, recover a backpack or try to approach it again. If the animal is still close, focus on creating separation and reaching cover when possible.
Once you are away from the bison, seek appropriate emergency assistance for any injury. Contact emergency services or get help from park staff as appropriate to your location. Tell responders that a bison struck, gored or knocked you down and describe where you are, so they can determine the appropriate response.
The official Yellowstone material explains prevention and escape, but does not provide a bison-specific first-aid procedure for someone who has been knocked down. It would be misleading to present an animal-specific treatment protocol as established guidance. Do not rely on an internet rule about a particular body position, playing dead or treating a wound unless qualified medical personnel direct you. After the animal has moved away, obtain professional assessment rather than deciding that an injury is minor because you can stand or walk.
If another person is hurt, keep the rest of the group away from the bison and get help from a safe location. Do not create a second emergency by gathering around the injured person in the animal’s path. Yellowstone’s published direction remains the same: leave the immediate danger first, then obtain emergency assistance.
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If bison are near your vehicle
For a driving encounter, Yellowstone NPS advises staying inside the vehicle, driving slowly and waiting for the bison to move along. Do not honk or drive aggressively toward the animal. Do not get out to take a photograph, inspect the bison or attempt to push it away with the vehicle.
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Remain patient even if traffic backs up. A bison may occupy the road or walk beside a vehicle before continuing. Follow ranger or traffic-control instructions, keep doors closed and allow the animal the time and space to leave. The vehicle is a place to remain protected; it is not a tool for herding wildlife.
What reported incidents do—and do not—tell you
NPS releases illustrate why the distance rule matters, but individual reports are not a measure of a visitor’s overall odds of injury. On May 7, 2025, Yellowstone reported that a man was gored after approaching a bison too closely at Lake Village on May 4. He sustained minor injuries and received emergency medical treatment. The release called it the first reported bison injury of 2025 at that time and listed two reported incidents in 2024 and one in 2023. Those are incident counts reported in that release, not comprehensive risk statistics.
In a release dated June 26, 2026, Yellowstone reported that a 12-year-old visitor was injured by a bison near Mud Volcano that morning. The incident was under investigation when the release was issued. NPS reiterated the minimum 25-yard distance. This dated report is an example of an incident, not evidence of a trend or a risk rate.
Neither release changes the immediate response: prevent close contact, leave when the animal approaches or displays warning behavior, and retreat if it charges. Do not use a single report to calculate a personal probability of injury or to conclude that a location is safe because no recent incident was announced.
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Common mistakes to avoid
- Standing still to prove you are not afraid. Yellowstone specifically says not to stand your ground during a charge.
- Approaching for a photograph. The park says never approach a bison for a photo and to turn around if one comes within the minimum distance.
- Waiting for a full charge. Head bobbing, staring, pawing, bellowing, tail-raising and bluff charging are reasons to leave.
- Using a vehicle aggressively. Honking or driving toward a bison can escalate the encounter; stay inside, drive slowly and wait.
- Borrowing bear advice. Bison guidance is its own instruction: move away, use bear spray if followed and seek cover.
- Stopping after a knockdown to treat yourself beside the animal. Get clear first, then seek appropriate emergency assistance.
- Assuming Yellowstone’s rule applies everywhere. Verify the local land manager’s distance and response guidance outside Yellowstone.
Quick decision guide
- Bison is at a distance: Keep at least 25 yards away in Yellowstone; do not approach for a photo.
- Bison approaches or shows warning behavior: Move away; back up or turn around and go the other way as needed.
- Bison charges: Walk or run away immediately; do not stand your ground.
- Bison follows: Use bear spray while moving away and seek cover behind a nearby tree or car.
- You are in a vehicle: Stay inside, drive slowly and wait; do not honk or drive aggressively toward the animal.
- You are knocked down or injured: Get clear of the animal, then seek appropriate emergency assistance.
Frequently asked questions
Should you run from a charging bison?
Yellowstone says to walk or run away immediately and not stand your ground. If the bison follows, use bear spray while moving away and seek cover behind a nearby tree or car.
How far away should you stay?
Yellowstone NPS says at least 25 yards, or 23 meters. If a bison approaches, increase the distance rather than remaining at the minimum. Other land managers may publish different rules, so check local guidance.
What does it mean if a bison paws or raises its tail?
Yellowstone lists pawing, raising the tail, bellowing, head bobbing while staring and bluff charging as warning or aggressive behavior. Leave immediately instead of waiting for a contact charge.
Does bear spray work on bison?
Yellowstone’s guidance says to use bear spray if a bison follows while you are moving away. It does not promise effectiveness and does not make approaching a bison safe. Keep retreating and seek cover.
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What should you do after being knocked down?
Get away from the animal if you can do so safely, then seek appropriate emergency assistance. Yellowstone’s published guidance does not provide a bison-specific first-aid protocol, so do not substitute an invented treatment routine for professional help.
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- MAX STRENGTH FORMULA: Made with 20% OC wildlife safe formula for maximum heat and potency, helping deter attacks and giving you time to retreat to safety.
- ALWAYS BE PREPARED: Essential for hiking, camping, and hunting. Its potent formula and long range spray coverage offers reliable protection so you can always be prepared for wildlife encounters.
- EASY TO USE: Designed with a finger loop handle for easy carrying and quick deployment in critical moments. To use, pull off the orange safety wedge and press down on the actuator.
- INCLUDES HOLSTER: Durable, heavy-duty nylon spray holster keeps your bear deterrent canister secure and within reach. Hook-and-loop closure allows for quick and easy access.
Can you drive around a bison blocking the road?
Stay in the vehicle, drive slowly and wait for the bison to move along. Do not honk or drive aggressively toward it, and do not get out for a photograph.
Are the reported injury numbers a risk rate?
No. NPS reported one 2025 incident as of May 7, two reported incidents in 2024 and one in 2023, plus an injury reported on June 26, 2026. Those dated reports are incident counts, not a comprehensive population-level risk estimate.
Frequently Asked Questions
Should you run from a charging bison?
Yes. Yellowstone says to walk or run away immediately and not stand your ground. If it follows, use bear spray while moving away and seek cover.
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Yellowstone NPS says at least 25 yards (23 meters). Back away or turn around if the animal approaches. Verify rules with other land managers.
What warning signs should you watch for?
Bluff charging, head bobbing while staring, pawing, bellowing and raising the tail are signs to leave immediately.
What if a bison knocks me down?
Get clear of the animal first, then seek appropriate emergency assistance. Yellowstone does not publish a bison-specific first-aid procedure for this situation.
What if a bison is beside my car?
Stay inside, drive slowly and wait for it to move along. Do not honk, drive aggressively toward it or get out for a photograph.
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In Yellowstone, keep at least 25 yards from bison and turn around when one approaches. If it charges, walk or run away rather than standing your ground; if it follows, use bear spray while retreating and get behind a tree or car. If you are knocked down, get clear first and then obtain emergency assistance. Check local land-manager rules wherever you encounter bison outside Yellowstone.
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