Animals Wildlife How Fast Can a Bear Run? By Olivia Young Freelance Writer Olivia Young covers a wide range of environmental topics, from low-impact travel to conservation. She is passionate about tiny living, climate advocacy, and all things nature-related. our editorial process Twitter Twitter Olivia Young Updated February 23, 2021 Jami Tarris / Getty Images Share Twitter Pinterest Email Animals Wildlife Pets Animal Rights Endangered Species Armed with astonishingly powerful forelegs, the brown bear, also known as grizzly, is the fastest of the eight bear species, reaching speeds of up to 35 mph, according to the National Wildlife Federation. The grizzly is only slightly faster than the world's most common bear species, the American black bear. Of course, a bear would be able to achieve such a feat only at the peak of its athleticism — not fresh out of hibernation, having lost 15% to 30% of its body weight — and only on certain soft, flat surfaces into which their long claws can sink. In any case, bears are surprisingly fast considering their hulky physiques. Discover the traits and characteristics that make their swiftness possible, and what to do (besides run) if you encounter one in the wild. Can You Outrun a Bear? pchoui / Getty Images Not even the fastest known human on Earth, Usain Bolt, could outrun a determined black or grizzly bear at its top speed. The famous Jamaican sprinter achieved the fastest recorded human foot speed ever during a 2009 race in Berlin. He was clocked going an incredible 27.8 mph, about 4 mph faster than his average speed and more than 10 mph faster than the average human's sprint. Still, that's 7 mph slower than the supposed top speed of a grizzly and just over 2 mph short of a black bear's. At his record speed, Bolt may be able to outrun a lumbering polar bear or an Asiatic black bear (moon bear), which top out at 25 mph, or a panda or sloth bear, which can reportedly go 20 mph. But even so, the line graphs that represent his breakneck sprints indicate that he — like any human — can only sustain his maximum pace for one to two seconds. A bear, however, can sustain speeds of 25 to 28 miles per hour for 2 miles, according to several reports from the 1930s in Yellowstone National Park (some of the only data on bear speed available to this day). The average human, running at a comparatively sluggish 15 mph, would simply not stand a chance. The good news is that bears, and most wildlife, would usually rather avoid humans than chase them. They generally only attack to protect their food, cubs, and space. Bear Speeds North American black bear: 30 mph Asiatic black bear: 25 mph Brown bear: 35 mph Polar bear: 25 mph Spectacled bear: 30 mph Panda bear: 20 mph Sloth bear: 20 mph Sun bear: 30 mph How Are They So Fast? jared lloyd / Getty Images Despite their burly, boxy frames, flat feet, and the thick layer of fur you'd think would weigh them down, ursid species are surprisingly speedy. Grizzlies, in particular, have protruding, muscle mass-topped shoulder blades that power their forelimbs to run and dig. This mound of muscle creates a distinguishing hump on their upper backs — the best way to tell a grizzly from a black bear. Bears also have impressive claws that can grow to be more than four inches long, which helps them find their footing on soft land, but can hinder their running ability on hard surfaces like asphalt. Because their forelimbs are shorter, they're strong enough to support more weight than their back legs. This lopsided stature has long given the impression that the animals can't run downhill, but that myth has been repeatedly debunked. The 1937 Yellowstone Nature Notes alone provide anecdotal evidence that a famous bear named Clubfoot was, in fact, slower going up than going down. It was "able to keep pace with a horse going downhill, but not uphill," the report from J. M. Mackenzie said. What to Do if You See a Bear Firstly, you can try to avoid bear encounters in the wild by making consistent noise while you're hiking and being diligent about proper food storage so as to not attract these mostly harmless creatures to your campsite. Know which bears frequent the area and how to identify them, because different species will require different reactions. For instance, if you encounter a black bear — the most common in the U.S., distinguishable by its straight-faced profile and tall, pointy ears — you should establish eye contact, make yourself big by spreading your arms, and make noise. On the contrary, making eye contact with a brown bear — distinguishable by its dished profile and prominent shoulder hump — is not advisable. Do not scream, yell, or make any alarming noises. Back up slowly, facing the bear if you can. It's best to carry bear spray if you know you'll be in an area frequented by grizzlies. No matter which species of bear you see, don't turn your back on it, and never run — their predator instincts will prompt them to chase. View Article Sources "Grizzly Bear." National Wildlife Federation. Robbins, Charles T., et al. "Hibernation and Seasonal Fasting in Bears: The Energetic Costs and Consequences for Polar Bears." Journal of Mammalogy, vol. 93, no. 6, 2012, pp. 1493-1503, doi:10.1644/11-mamm-a-406.1 "100 Metres Men." World Athletics. Gómez, J J Hernández, et al. "On the Performance of Usain Bolt in the 100 M Sprint." European Journal of Physics, vol. 34, no. 5, 2013, pp. 1227-1233, doi:10.1088/0143-0807/34/5/1227 Kearns, William E. "Yellowstone Nature Notes." United States Department of the Interior. vol 14, no. 1-2, 1937. Shine, Catherine L., et al. "Grizzly Bear (Ursus Arctos Horribilis) Locomotion: Forelimb Joint Mechanics Across Speed in the Sagittal and Frontal Planes." The Journal of Experimental Biology, vol. 220, no. 7, 2017, pp. 1322-1329, doi:10.1242/jeb.140681 "What To Do About Black Bears." The Humane Society of the United States. "Staying Safe Around Bears." National Park Service.