While the brown/grizzly bears are essentially genetically alike in Alaska then down thru Canada into the Northern Rockies (Idaho and Montana west of I-15 and north of I-90) and the Central Rockies (east of I-15 and south of I-90) into Wyoming, they use different habitats and have different habits between these two extremes of their range.
No bear deterrent is 100% effective. But the facts are that bear spray has been proven effective and is widely used by folks that live in the Idaho, Montana & Wyoming areas. Many of us carry both bear spray & a firearm.
If you're a visitor, or have moved to the parts of Idaho, Montana and Wyoming where grizzly's occur, getting bear spray should be considered if you going out into bear country, especially since you're likely not familiar with local conditions. It's everyone's choice.
BUT, note the info below regarding carrying a gun in the National Parks in Montana, Wyoming & Idaho.
discoveringmontana.com
Note: The concealed carry permit requirement in MT has gone away other than were prohibited by signage.
www.yellowstonepark.com
And it's very important to have situation awareness has you spend time in griz/brown bear country.
Here's just a repeat of useful info.
bearwise.org
Additional note: Moose are very dangerous also.
www.wildlifexteam.com
No bear deterrent is 100% effective. But the facts are that bear spray has been proven effective and is widely used by folks that live in the Idaho, Montana & Wyoming areas. Many of us carry both bear spray & a firearm.
If you're a visitor, or have moved to the parts of Idaho, Montana and Wyoming where grizzly's occur, getting bear spray should be considered if you going out into bear country, especially since you're likely not familiar with local conditions. It's everyone's choice.
BUT, note the info below regarding carrying a gun in the National Parks in Montana, Wyoming & Idaho.
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Can You Carry A Gun In Yellowstone National Park? - Discovering Montana
So, can you carry a gun In Yellowstone National Park? Before you travel to Yellowstone National Park, here is some helpful information.
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Note: The concealed carry permit requirement in MT has gone away other than were prohibited by signage.

Can I Bring a Gun to Yellowstone?
Yes, you can carry a gun in Yellowstone. But it's illegal to fire it - even in self defense. And once you exit Yellowstone, you could be in one of three states, so it's important to know the law.
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And it's very important to have situation awareness has you spend time in griz/brown bear country.
Here's just a repeat of useful info.
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Bear Spray
Bear spray is an effective deterrent for black bears and grizzly bears. Find out where to buy, how to use safely, and FAQs. Be BearWise.
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Additional note: Moose are very dangerous also.
Moose Attacks More Dangerous Than Bear Attacks: How To Protect Yourself : Wildlife X Team
Most people are afraid of bears, but even more dangerous in Northern regions are Moose. While moose aren’t necessarily deadlier in behavior than bears, moose populations outnumber bear populations greatly, so you’re much more likely to have an encount
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