Colorado Mountain School - Boulder, CO

Zade Faraj

Just completed my first guided outdoor climbing experience ever with Jason Antin (our guide), and all I can say is 'WOW'. I was completely blown away.. What an experience!! Jason was awesome! He explained everything, providing expert guidance throughout our climb of the 3rd Flatiron.

I had never done any technical outdoor climbs before, all indoor, but living in Boulder, I felt this was a must. I was a little nervous at first, but I never felt unsafe, and the more we climbed, the easier it all felt.

The summit? Spectacular! I can never look at the Flatirons again the same way. Repelling off the back was just as fun. Again, never done it before, but Jason walked us through it all and made it seem so easy. Yeh, I got the bug, and I can't wait to do it again!

If you've been thinking about it.. if it's been on your mind.. don't wait anymore. DO IT! You will thank yourself you did.

Michele Cooper

We had a fantastic experience climbing the first flatiron with Jason! We wanted a guided climbing date night (I have very little climbing experience) and wanted it to be at sunset. Jason nailed it! Jason is knowledgeable and experience and he helped us both feel comfortable and safe and we had plenty of laughs along the way! If you have an adventure in mind or need someone to help drum something up with you, Jason is your guy to help execute!

Connor Brass

Had an absolutely epic time at Lumpy Ridge on 8/30/24 with Jason Antin. He was an incredible guide and designed the perfect wide crack training day for me to get ready for some climbing goals this fall. He was also just a cool guy to hang out with for a day. I cannot recommend him enough to any future clients looking for a full value day in the mountains. I don't seek out "guided" experiences very often but I definitely plan to hit Jason up in the future, would highly recommend!!

John Luna-Lima

I reached out to Jason Antin/Colorado Mountain School to set a foundation for safe trad and alpine climbing. We met in Eldorado Canyon and the class went above and beyond all my expectations. We covered all the basics of placing gear, climbing on lead with gear, anchoring and rappelling. Jason was open to all my questions and answered them with expertise and patience. I will definitely be booking another class in the future. Very grateful for this experience!

Jason Niemeier

Took my AMGA single pitch instructor course with Jason Antin through the CMS. I was 110% satisfied by this experience with Jason most impressed by his knowledge, ability to communicate, method of delivery, open mindedness, honesty, professionalism, all while maintaining a good sense of humor. A perfect combo for a guaranteed positive experience as a client.

David Trow

The complete adventure package. We had an outstanding experience climbing the 3rd Flatiron with Jason and Norie as our guides. Their passion and expertise was immediately obvious. They ensured everyone felt comfortable and supported throughout the climb while also making it a very fun experience. I can't say enough about these two guides and the quality of trips offered by the Colorado Mountain School.

Brent Franson

Jason is the perfect guide and a true pleasure to be around. He is as knowledgeable as they come, readily shares his knowledge throughout the journey, and consistently ensures safety. An A+ guide all around—I couldn't recommend him more highly.

John Barker

Did a half day fun climb with Ryan as our guide. It was awesome and Ryan was great! There were 4 of us and only one had any climbing experience to speak of. The mix of climbs was perfect for the group. Doable but hard enough to get the adrenaline pumping for all of us. Highly recommended!