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.

Rugged trail. Amazing views.

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.

hiking
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.

This is a short but challenging hike. Great views along the way and at the top. The hike up will get your heart going. The hike down seemed almost as hard, especially on the knees. There are lots of trails in this area. Pay careful attention to your route to the base of this trailhead as there are several that will bring you here.

This trail is rated difficult for a reason. Tons of large rocks and quick elevation gain. If you have balance issues or are afraid of heights I would say don’t do. The views at the end are fabulous though, great workout! Beware of small area that would almost qualify as rock climbing and not hiking although once you got up wasn’t that bad because of the hand and foot holds they added. Fairly heavily trafficked trail also..

on Mallory Cave

hiking
1 month ago

Very nice!

1 month ago

Nice hike, great views at the top!!

Incredible trail with great views. Took a little over 7 hours but wasn’t really hurrying to get through the trail. Would definitely do again. Be sure to bring enough water.

Gorgeous trail; good variety of strong incline, walking through forest, and climbing over some cool rock runs.

A couple clarifications - this one seems to be a loop as opposed to another one on the list that’s just an out an back (confused me for a little bit as I was researching). Second the trails closed 8-4:30 Monday - Thursday but climbers are allowed to climb up the First and then take the trail down. Looked beautiful but unfortunately misread the climbing exception.

Definitely a solid hike. The trail itself seemed a bit less scenic than the trail to Royal Arch but the view at the end is much more stunning. You get a clear view of the Rockies from the top of the first flatiron and it makes the trek up worth it. For most people trying to enjoy themselves and appreciate the surrounds give it anywhere from 1.5-2.5 hours. But if you've got something to prove I'm sure you could do it faster.

This was a quick 45 minute hike up for someone that is athletic. I really enjoyed it, but it was a little too short for me.

great views throughout, tough with some tricky rock spots, have good shoes/boots

This was a tough but worthwhile trail. The most taxing part was the first part up to the tree line/base of the mountain. There are a few tricky places to get up so make sure you have good shoes. The view from the top of the first flatiron is gorgeous though and makes it worth the trek! We went after work around 5pm and it was not very crowded and parking was free.

Absolutely beautiful views at the top make this difficult hike worth it. The trail is rocky terrain the whole way to the top (so wear good shoes or be cautious of where you place your feet) and some areas require a short scramble up rock faces (thankfully, with divots for your feet). I’d recommend that each person on the hike take a full water bottle and a snack, as my group (not acclimated to the elevation and generally unfit) took about 5 hours with a 1 hour at the top to take in the views and a well-deserved break. If you have poor knees, wear a brace as the steep decline is rough on knees.

Challenging hike for people not used to high altitude but well worth the workout and beautiful views. Hiking for a pay off

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