Mountain lions are ambush hunters. That means by the time one is standing in front of you on a trail, there’s a good chance it’s been sizing you up for a while. That’s not meant to freak you out — it’s just how they operate. Knowing that changes how you think about the encounter.
If you do come face to face with one, the number one rule is: don’t run. Idaho Fish and Game explains it plainly — a lion’s instinct is to chase whatever looks like fleeing prey. Running basically flips a switch in their brain. You don’t want that switch flipped.
What you want to do instead is the opposite of everything your scared brain will tell you. Stand tall. Make yourself look as big as possible — raise your arms, open your jacket wide, lift anything you’re carrying. Don’t crouch down. Don’t turn your back. Face the lion and speak in a loud, firm voice. Not a scream — a loud, confident voice. The goal, as the National Park Service puts it, is to convince the lion that you’re not prey and that you might actually be a threat to it.
If the lion is far away and just watching you or slowly following, that’s more curiosity than aggression. In that case, back away slowly, keep it in your peripheral vision, and look for rocks or sticks nearby just in case things change.
If it attacks? Fight back. Throw whatever you can grab — branches, rocks, your water bottle. Do not play dead. That’s bear advice, and it is the wrong move here.
The short version: big, loud, and facing forward. That’s your whole playbook.