Bear spray is highly effective, with 90-92% success rates in deterring bears. Carry it in an accessible holster, and when a bear charges within 60 feet, remove the safety clip and spray at a downward angle to create a barrier cloud. Practice beforehand and check your canister's expiration date.
Bear spray is highly effective at stopping aggressive bear behavior. Research shows success rates of 90-92% in deterring bears, with 98% of people carrying bear spray uninjured in close-range encounters. The spray stopped undesirable bear behavior in 92% of brown bear incidents, 90% of black bear incidents, and 100% of polar bear incidents. Bear spray works by releasing capsaicin in a large cloud that irritates the bear's eyes, nose, and respiratory system, causing temporary discomfort that drives the bear away without causing permanent harm.
To use bear spray effectively, carry it in an immediately accessible chest or hip holster—never in your backpack. When a bear charges, remove the safety clip with your thumb while holding the canister firmly. Begin spraying when an aggressive charging bear is within 60 feet of you, aiming the spray slightly downward at about a 45-60 degree angle to create a barrier cloud the bear must pass through. Deploy the spray to create a cloud between you and the bear, and be ready to spray multiple times. The goal is for the charging bear to hit the spray cloud at approximately 30 feet, giving it time to feel the effects and divert before reaching you.
Environmental conditions rarely prevent bear spray from working—wind affected accuracy in only 7% of documented cases, and the spray still reached the bear in all instances. Bear spray remains effective across seasons, though snow, rain, and cold weather will decrease spray distance. Practice removing the safety clip and deploying your spray before heading into bear country. Check your canister's expiration date (typically 3-4 years from manufacture) and ensure it's EPA-registered with 1-2% capsaicinoids and can spray at least 25-30 feet. Remember that bear spray is not meant to be worn or sprayed on skin, clothing, camping gear, or other personal items—it should only be used when a bear is actively charging or attacking.
Sources
- [1] Smith, T.S., Herrero, S., DeBruyn, T.D., Wilder, J.M. "Efficacy of Bear Deterrent Spray in Alaska." Journal of Wildlife Management. 2008. https://bearwise.org/wp-content/uploads/2017/07/efficacy-of-bear-spray-smith-et-al.-2010.pdf
- [2] National Park Service. "Staying Safe in Bear Country: Bear Spray & Firearms." U.S. National Park Service. 2020. https://www.nps.gov/articles/bearsprayfirearms.htm
- [3] Be Bear Aware Campaign. "Deploying Bear Spray." Be Bear Aware Campaign. 2024. https://www.bebearaware.org/deploying-bear-spray
- [4] BearWise. "Bear spray is an effective deterrent. Learn how to use it safely." BearWise.org. 2025. https://bearwise.org/bear-safety-tips/bear-spray/
About the author

Dr. Colin Little
MD, FAWM, Chief Medical Officer, GOES Health
- Board Certified Emergency Physician
- Fellow of the Academy of Wilderness Medicine (FAWM)
- Wilderness Medicine Fellowship, University of Utah
- Emergency Medicine Residency and Chief Resident, Stanford / Kaiser
- Doctor of Medicine, University of Arizona College of Medicine – Phoenix
