From 1980-2015, over 104 million people visited Yellowstone National Park. During the same 36-year period, 38 people were injured by grizzly bears in the park. For all park visitors combined, the chances of being injured by a grizzly bear are approximately 1 in 2.7 million. The risk is significantly lower for those visitors that don’t leave park developments or roadsides, but much higher for those hiking in backcountry areas. When backcountry hiking, you can reduce the odds of being injured by a bear by: 1) hiking in groups of 3 or more people, 2) staying alert, 3) making noise in areas with poor visibility,4) carrying bear spray, and 5) not running during encounters with bears.
Grizzly Bear-Inflicted Human Injuries
Grizzly bear-inflicted injuries to humans in developed areas averaged approximately 1 per year during the 1930s through the 1950s, and 4 per year during the 1960s. Grizzly bear-caused human injuries in developed areas then decreased to 1 injury every 2 years (0.5/year) during the 1970s. During the last 36 years (1980-2015), there have been only 2 (0.1/year) grizzly bear-caused human injuries in developed areas, an average of approximately 1 every 18 years.
During the 35-year period from 1980-2015, there have been 34 human injuries caused by grizzly bears in the backcountry, an average 1 per year.
|Type of Recreational Activity||Risk of grizzly bear attack|
|Remain in developments, roadsides, and boardwalks||1 in 25.1 million visits|
|Camp in roadside campgrounds||1 in 22.8 million overnight stays|
|Camp overnight in the backcountry||1 in 1.4 million overnight stays|
|Backcountry travel||1 in 232,000 person travel days|
|All park activities combined||1 in 2.7 million visits|
Bear-Caused Human Fatalities
During the 145-year (1872-2015) history of Yellowstone National Park, eight people have been killed by bears in the park. More people in the park have died from drowning, burns (after falling into thermal pools), and suicide than have been killed by bears. To put it in perspective, the probability of being killed by a bear in the park (8 incidents) is only slightly higher than the probability of being killed by a falling tree (6 incidents), in an avalanche (6 incidents), or being struck and killed by lightning (5 incidents).
- August 2015 – a day hiker, hiking by himself, was killed by an adult female grizzly bear with two cubs near the Elephant Back Loop Trail in the Lake Village
- August 2011 – a day hiker, hiking by himself, was killed by a grizzly bear on the Mary Mountain Trail in Hayden Valley.
- July 2011 – a day hiker in a party of two was killed by an adult female grizzly bear with 2 cubs on the Wapiti Lake Trail in Hayden Valley.
- October 1986 – a photographer was killed by an adult female grizzly bear near Otter Creek in Hayden Valley.
- July 1984 – a grizzly bear killed a backpacker in a backcountry campsite located at the southern end of White Lake near Pelican Valley.
- June 1972 – an old adult female grizzly bear killed a man in an illegally established camp. The man surprised the bear when he returned to his campsite at night. The bear was in his camp feeding on food that he had left out unsecured in the campsite.
- August 1942 – a bear killed a woman at night in the Old Faithful campground. The species of bear involved was not determined.
- 1916 – a grizzly bear killed a man in a roadside camp.
- A possible fatality supposedly occurred in 1907 when a man was attacked by a female grizzly bear after he prodded her cub with an umbrella. The account of the incident appeared in a popular book, “Book of a Hundred Bears” published in 1909 by F.D. Smith. However, the validity of this incident is questionable as there is no mention of it in official park reports or local newspapers from 1907. The “Book of a Hundred Bears” contains many stories without providing back-up documentation. The 1907 story appears to be an unsubstantiated legend.
MORE BEAR FACTS TO KNOW
- 7 ways to reduce a bear attack
- How do you tell a black bear from a grizzly bear?
- What is difference between defensive and predatory bear attack?
- What do bears eat?
- grizzly bear facts
- grizzly bear ecology
- black bear facts
- black bear ecology
- bear management areas in Yellowstone ecosystem
- grizzly bears and the Endangered Species Act
- bear-inflicted fatalities and injuries
From the National Park Service