Explore the most popular rock climbing trails in Boulder Open Space with hand-curated trail maps and driving directions as well as detailed reviews and photos from hikers, campers and nature lovers like you.

Amazing trail very well worth it

Started at 7am to beat the crowds (and get parking)! Hiked around to the back of the first flatiron to view the front range.

My husband, friend, and I hiked this back in 4/2017. It was pretty much my first “real” mountain hike and will always be one of the most meaningful to me. I have a thing with heights but we made it to the tippy-top of the 2nd flatiron! If you’re planning on “celebrating” definitely wait until the top haha. Even if you’re not the most experienced hiker and it’s intimidating, go all the way - you won’t regret it. I definitely recommend appropriate footwear and gear (lots of water if you’re not used to the elevation)! We will be back!!!

We got lost several times on other side trails and had to turn around and walk back so make sure you pay attention to the route and signs. Other than that, a beautiful hike. We did encounter several piles of fresh bear sh**. So be cautious. :)

Gorgeous views, different types of terrain on the way up. Lots of traffic for a reason. This is a must in the Boulder area even if once. The Flatirons are stunning. The ascent is steep at times, but it’s manageable even for this visitor from out of state.

Step clim but completely worth the views! Very transited.

Went to hike this today (10/2/18) and it's CLOSED until November 15th for trail construction. Tried to go anyway and it was fenced off with a construction worker watching the entrance in the middle of the day.

If you’re acclimated to higher elevations or go hiking frequently this trail isn’t very hard. The terrain is interesting and has great views from the top. I went around 10am on a Friday morning and the parking lot and lower trail was VERY crowded.

Definitely a harder hike with the steep inclines. It was very busy when we went. But well worth it when you get to the top.

Easily accessible, fairly quick hike but good exercise, heavily trafficked so easy to feel safe if you are going on your own. Don’t be fooled by the false summit—keep going all the way to the top and the view of the front range.

18 days ago

Great morning hike! Lovely views in some spots and mostly very shaded. Does get a bit rocky and steep at some points but mostly pretty accessible.

Great hike with the doggo this evening! The trail to the cave was nearly empty, with the exception of a few runners on the front end pursuing the Mesa Trail. The cave at the top was closed for bats, but beautiful views of the Boulder Valley and Flatirons throughout!

Bring water for this hike! A little tough on the way up but definitely worth it! Very heavily trafficked but the climb is so great.

Rugged trail. Amazing views.

1 month ago

Good hike...go early as it gets busy with hikers. make sure you wear your hiking boots. it's a bit rocky in places.

Good workout, kinda shaded making it nice during summer heat. Great views from top.

Challenging with some nice portions of rock scrambling. Views at the top are a little obscured and trail is a busy. Definitely worth it though!

Fantastic for a short hike, quick elevation with a family!

Short but rewarding trail. Easily marked. I’ve done this trail three times now and never had a problem with crowds. The elevation makes it harder.

Nice short and relatively easy hike! Took us 45 min to get to the cave. The views from boulders are great.

Definitely challenging but still doable! Great views, fun hike but quick elevation gains.

Great terrain and an amazing payoff at the top

Closed M-Thurs 8am-430pm.

Free parking today though...

Great hike! The incline is steep right off the bat, beautiful forest hike, great views of Indian Peaks from the top. Lots of folks on the trail. Beautiful!

1st and 2nd Flatiron Trail was closed today due to trail damage, so I ended up taking the “Flatiron Loop.” The Flatiron Loop offers the opportunity to veer off and continue on the Golden Arch Trail, however was disappointing, not many views.

1 month ago

great views from multiple points in the hike. cave is closed most of the time, so if you were looking for caves and bats, check elsewhere.

Awesome trail!

Great hike. Rated as hard because of the rocky terrain and some mild scaling of rocks but well worth the view. Make sure to pack water as the incline is pretty steep.

Super warm hike . Decent trail, not too technical.

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