How does bear spray work

This is How Bear Spray Works (Guide + Tips & Tricks)

Note that this post contains affiliate links and we may earn a small commission at no extra cost to you if you buy something.

Real-life bear encounters might be rare but you don’t want to come face to face with one barehanded. Especially if you like hiking in the wilderness or if you live in a remote area. This is why you should definitely carry an anti-bear spray, just in case. But how does bear spray work?

Bear spray works by shooting aerosol bursts of particles derived from hot red pepper extract (usually capsaicin) that temporarily incapacitates the animal.

Using this spray on a bear will irritate its eyes and nose, while also swelling its mucus membranes that lead to shortness of breath and panic.

These effects will most likely make the bear run away, thus giving you precious time to turn around and get out of there!

And while it might sound like animal cruelty to some, remember that a bear spray can be the difference between leaving unscathed or ending up seriously injured and even dead.

What is Bear Spray?

Bear spray is a type of non-lethal deterrent that comes in the form of a spray designed to prevent an aggressive bear from attacking you.

In fact, a bear spray is nothing more than a regular pepper spray but with a weaker formula.

Bears have a sense of smell that’s 2100 times better than that of humans!

Yes, you read that right – regular pepper sprays that are meant to be used against human attackers are typically 2-5 times more potent than their animal equivalent.

Bears just need a much smaller amount of capsaicin than us in order to be incapacitated.

The red pepper extract that a bear spray contains can effectively inflame the eyes and nose of a bear, leading to irritation and shortness of breath.

And this type of self-defense weapons are not meant to kill your target, but to temporarily disable it so that you may escape danger.

How does bear spray work, red chili peppers

What is Bear Spray Made of?

Bear sprays are generally made of red pepper oil (oleoresin capsicum or OC) that’s derived from the very hot cayenne peppers.

The active ingredient found in this oily substance (OC) is capsaicin, which is a chemical compound isolated from chili peppers.

Note that the oil-based chili pepper extract is very sticky and tenacious.

Capsaicin causes a burning sensation when it comes in contact with the skin, while the primary effects of this chemical are pain, redness, swelling, and inflammation.

And this is what happens when oleoresin capsicum ends up on the bear’s face:

  • Its eyes close
  • The lungs constrict (i.e. they tighten up)
  • Excessive mucus production begins

And all of this is achieved by only around 1-2% of capsaicin as the main active ingredient in your typical bear spray.

The United States Environmental Protection Agency (EPA) regulates the production of bear sprays and they only allow a maximum of 2% capsicum oleoresins per product.

This is how strong this chemical compound really is – you don’t need much of it to make the bear twink twice before attacking you.

Counter Assault 8.1 Oz / 10.2 Oz Bear Spray Combo Pack
  • Includes one 10.2 oz spray can and one 8.1 oz...
  • 32 to 40 foot spray distance with 7 to 8 second...
  • Works on all bear species to deter from human...

How Does a Bear Spray Work? (Detailed Explanation)

Bear spray self-defense products work by propelling highly-concentrated hot pepper extract at the animal, as previously mentioned.

Here’s what happens behind the scenes when you pull the trigger:

  1. The capsaicin-gas propellant mixture is pressurized at 80 PSI (pounds per square inch)
  2. The capsaicin chemical boils upon leaving the can
  3. This atomizes the chemical/gas mix that turns into a cloud

Now, as we get into the more technical stuff it’s worth mentioning that there’s a particular gas propellant that’s used in most models on the market.

That’s the R134a gas, which is the propellant that you’d find in your run-of-the-mill asthma inhaler.

This gas propellant is what forms the visible cloud that we call spray when it’s mixed with the capsaicin chemicals.

And the entire reaction between the chemicals and the gas is what helps bear sprays fire the red-hot combo at roughly 75 mph!

Where is Bear Spray Legal?

Bear spray is legal to buy and possess across the United States and most other countries across the world.

However, some particular national parks have strict rules regarding the use of such non-lethal self-defense devices.

Below you’ll find a list of some of the most popular national parks in the US that allow bear sprays on their territory and those that don’t.

Allowed in:

  • Great Smoky Mountains National Park
  • Yellowstone National Park
  • Zion National Park
  • Olympic National Park
  • Grand Teton National Park
  • Rocky Mountain National Park
  • Glacier National Park

Banned in:

  • Acadia National Park
  • Yosemite National Park
  • Grand Canyon National Park

But even if you’re in a national park where it’s allowed to have a bear spray with you, always use it for what it’s intended for.

That is, as a self-defense tool to prevent an angry bear from mauling you.

SABRE Frontiersman 7.9 oz. Bear Spray, Maximum Strength...
  • MAXIMUM STOPPING POWER: Strongest formula allowed...
  • SPRAYS UP TO 50% FURTHER: With a 30-foot (9-meter)...

Bear Spray Pros and Cons

Here we’ve hand-picked the main strengths and weaknesses associated with bear sprays.

The Pros:

  • Highly-effective against wild animals (such as bears)
  • Non-lethal (i.e. won’t kill your target)
  • Easy to carry (compact and lightweight)
  • Legal to use in most states and countries
  • Doesn’t require a great aim
  • Covers a lot of ground

The Cons:

  • You can accidentally spray yourself if the wind is blowing your way
  • Bigger models are heavier and bulkier
  • Smaller versions aren’t as effective


What does bear spray do to humans?

Not much as it’s way weaker in terms of potency than a pepper spray that’s meant to be used against humans.

Contrary to popular belief, a bear spray is roughly 20% weaker than a spray that you might use against muggers.

Still, the expected effects can be identical to what an animal might suffer from, such as:

  • Burning sensation on the skin
  • Shortness of breath
  • Excessive mucus production
  • Eye and nose irritation

Can bear spray kill a human though?

No, a bear spray will not kill a human hence why it’s labeled a non-leather weapon.

It’s much weaker than any of those self-defense pepper sprays and it might not even fend off your attacker.

Even pepper spray-related deaths are very rare, although they do exist.

Are bear sprays effective?

Yes, they’re very effective at stopping an aggressive bear at its tracks.

In fact, research done on the subject shows that a spray is effective in approximately 90% of bear encounters while using firearms resulted in injuries in 50% of cases (1).

Still, don’t forget that guns and rifles are lethal weapons and can be 100% effective at stopping (read killing) a bear if that’s your only option to remain alive.

Sprays, on the other hand, even highly-effective are still affected by outside factors like wind direction, which might lead to a “rather” tricky situation.

How to use a bear spray?

This is how to properly use your bear spray in 5 simple steps:

  1. Remove the safety clip on the canister
  2. Aim slightly down and make sure to stay upwind
  3. Hold the spray firmly and way for the appear to come closer (about 30 ft from you)
  4. Start firing short 2-3 second bursts of the spray until the bear turns away
  5. Slowly back away while the bear is temporarily disabled

And don’t forget to stay fully alert as you back away since you can’t be 100% sure that the bear wont’ follow you.

Pro tip: Always keep it within reach (in an external pocket or backpack)

Another important thing to remember is to always use the bear spray for what’s supposed to do i.e. stop an angry bear.

How long do the effects of bear spray last?

Approximately 30-45 minutes after being sprayed.

Of course, this might vary depending on external factors such as wind direction, distance, temperature etc.

Also, applying milk to the sprayed area can help to break down the oleoresin capsicum oils, thus reducing the potency and duration of the effects.

How does bear spray work, red chili pepper sliced

What does bear spray smell like?

Bear sprays smell like hot chili peppers.

Even staying near the area that’s been sprayed means that you’ll still be able to smell the very sharp and biting smell of a bear spray.

Still, it’s not as bad as the smell of pepper sprays, which is even stronger and sharper.


You can now feel that much safer during your next adventures in the wilderness as you know how a bear spray works.

This very effective non-lethal weapon shoots highly-concentrated capsaicin extract derived from hot peppers that should stop any bear.

But before you go right ahead and buy one, make sure that the park or place that you’re going to allows the use of such weapons.

Have you ever used a bear spray before and how was it?

And if not, do you consider getting one just to err on the side of caution when hiking in the wilderness?

Go on, leave your answer below!

Survival copywriter at Atlantic Survival Gear | Website | + posts

Evelyn is a young and adventurous spirit fueled by her unwavering passion for the outdoors and survival. From an early age, she was captivated by nature's beauty, and her thirst for exploration knows no bounds.

Evelyn's love for the wilderness extends beyond admiration. She has dedicated herself to mastering survival skills, from building shelters to foraging for food. Fearless and determined, she embarks on thrilling expeditions, conquering rugged terrains and embracing the challenges that come her way.

As an advocate for environmental stewardship, Evelyn strives to protect and preserve the landscapes she cherishes. Through her inspiring journeys and responsible outdoor practices, she encourages others to connect with nature and discover their own inner strength.

She stands as a beacon of inspiration for young women seeking adventure and a deeper connection with the natural world. Join her on an unforgettable journey of discovery, self-reliance, and the boundless beauty that awaits in the great outdoors.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top