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    Mallory Cave Trail - NCAR Mesa Trail

    4.2 (10 reviews)

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    Jason Z.

    Those lucky locals get to hike these trails right next to town. There's free parking at NCAR and plenty of moderate trails to hike. The cave trail provides a decent amount of elevation gain and is doable for kids and also adults who want to escape the city.

    Ncar trail
    Cecile H.

    This is a hiking trail with beautiful view on the flatirons. There is a lot of parking available at NCAR. The trail head is on north side if the building. The trail is popular so don't expect to be alone. The views are stunning.

    Christian B.

    To climb this trail one must call upon their inner mountain goat. This is a steep, rocky, rough terrain but the views are phenomenal. From the NCAR building to the cave its about 2.7 miles and there is an elevation gain of around 850 ft. When I went the last portion of the trail and the cave were closed due to some bat disease. But this is a good trail overall. There is plenty of parking at the NCAR building parking lot. Make sure to wear study shoes, comfortable clothing and bring a couple of bottles of water per person. Total round trip hike time is around 1.5 to 2 hours depending on expertise and fitness level.

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    Lion's Lair Trail - Views at the end of spring.june 14, 2016

    Lion's Lair Trail

    4.4(5 reviews)
    4.3 mi

    Great trail. Nice views. A little over 4 miles with a manageable, gradual incline. I'd say it's…read moremoderate but not particularly challenging. Saw a lot of people running. The trail is well-maintained and marked. The trailhead sign isn't readily apparent from the road so we had to pull over and check that it was the right one. The GPS did have the trailhead as slightly further down the road but we ended up in the right place. There's parking along the road, FYI. The trail will take you to the top of Mount Sanitas. Take a look at the map I posted -- there are multiple trails that take you to the peak.

    Beautiful hiking trail just outside of Boulder. I freaking love this trail. I was in Denver and…read moreBoulder for a conference & to see friends. This was one of the short hikes I was hoping to squeeze into my busy day so that I could get that amazing mountain view that I don't get to see in the city. The trail itself is not too steep, and offers beautiful views all around, no matter where you are on the trail. When you are navigating to the trail, you will be driving uphill, and lose cell signal as you approach the base. There isn't really any signal on the trail in general. Parking is all roadside parking at the curved bend of a road. There are clearly areas to park for hikers. This trail when I was hiking was populated by locals either hiking solo or in a small group. Would definitely recommend for a couple hour hike. Only took me about 2 hours.

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    Lion's Lair Trail
    Lion's Lair Trail - View from Lion's Lair!

    View from Lion's Lair!

    Lion's Lair Trail - Front the top of Sanitas we decided to take the Lion's Lair trail and it was nice and flat. Easy way down, but definitely a longer way down.

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    Front the top of Sanitas we decided to take the Lion's Lair trail and it was nice and flat. Easy way down, but definitely a longer way down.

    Gregory Canyon - Right by the road at the trailhead. Just enjoying a nice fall day!

    Gregory Canyon

    4.8(6 reviews)
    1.6 mi

    This trailhead is a hub with access to many other trails. I wanted to climb Flagstaff Mountain and…read morethere are multiple options to get to the top. I started with the GC trail and created a loop with Rangeview and Flagstaff. Rangeview delivered an amazing view of the Rockies. GC is on an incline so you get to look down into the creek and canyon. The western side also offers views of the adjacent Chautauqua Park. Flagstaff summit was not as dramatic, and upon the descent you look out onto Downtown Boulder. I inadvertently took Crown Rock trail, which I do not recommend. It has a lot of loose rocks and gets slippery. Trails were easy to follow and major intersections had clear signage. Only six parking spots! However, you can park for free with some off-road spots on Baseline Rd. I regret starting at 9:30 as trails were pretty sunny. Rangeview offered some needed shade.

    Wow what a marvelous trailhead! The other reviewer was right, you could get to all of Boulder…read moreMountain Parks from here. I arrived around 11am on a weekday and the lot was about half full. There's a few trails that all connect up to Green Mountain, so take your pick. It too me about an hour to summit. The trail was beautiful and in better shape than the Bear Peak trail. It's less steep, but still pretty long and can be an adventure. You get some amazing views, better than Bear I think. Seeing the first flatiron above the fog was so pretty. The summit sports a register and a lot of chickadees begging for food. Don't feed them! Enjoy the mountain air and sunshine, and the fact your so close to town after your hike!

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    Gregory Canyon
    Gregory Canyon - Welcome

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    Gregory Canyon - Rangview Trail is highly recommended

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    Rangview Trail is highly recommended

    Mallory Cave Trail - NCAR Mesa Trail - hiking - Updated June 2026

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