Cal Hiking and Outdoor Society

UC Berkeley’s oldest and coolest club for the adventurer in you.
We’ve been a community of hikers, backpackers, climbers, and lovers of nature since 1870. Our goal is to have fun.

Join our DISCORD!!! Over 2500 people have already joined, and conversations are happening every day. Get plugged in.

WED 3/15 Potluck & Slackline!



What is CHAOS?


The rad people in the club

Make new friends, learn valuable outdoor skills, and create life-long memories! Connect with over 3,000 members on our listserv as a member. Become a member here. Join our discord to get plugged into our community, or come to weekly meetings at various locations👇

Gear Shed

We got you covered

We know gear is expensive – that’s why we provide you with gear rentals for your next trip. Our gear shed has a ton of stuff and the best part – it’s free as a member. 

Find out more about it here.
Find a gear shed hour that works for you here.

Cool Trips

The Email List

The email list is the place where you can find trips of all experience levels, advice for any activity, and find people to get outside with.

Find out how to join our mailing list here.

Come to our weekly meetings!

Every Wednesday at 7:30 PM! Location varies week to week and is posted here on our website, on our discord, on our email listserv (member only), and on our Instagram (@berkeleychaos).

Meet cool people and talk about outdoorsy stuff!

  • Isn’t the website neat? We want your photos featured on it to make it even cooler! If you have awesome trip photos send them to us!
  • Shout-out to some of our sponsors: