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Best Trails

Royal Arch Trail

Boulder, CO

Royal Arch Trail is a 3.2 mile out and back trail located near Boulder, Colorado that features beautiful wild flowers and is rated as difficult. The trail is primarily used for hiking, mountain biking, trail running & walking and is accessible from May until November. Dogs and horses are also able to use this trail.

  • Best Hiking

  • Best Mountain Biking

  • Best Trail Running

Recent Reviews

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Hall Ranch
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13 Completed 2 Reviews

Nice for trail running, mtn bikers courteous n share the trail. One lazy rattlesnake last summer, jumped over him ans ran on....

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Button Rock Preserve: Sleepy Lion Trail
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4 Completed 2 Reviews

Word to the wise: Somewhere near the highest elevation of the loop, it is very easy to get onto another trail called the Button Rock Trail. It eventually (5+ miles) gets to another trailhead called Hall Ranch, at least 10 driving miles and a few ridges away from the parking lot at Longmont Dam. I got 2 miles down this path before turning back. Never did see where the Sleepy Lion & Button Rock divergence was marked. A gate simply said "you are leaving Button Rock Preserve" with no other options.

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Button Rock Preserve
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1 Completed 1 Reviews

Did this trail last week - we took the trailhead as marked on this map. Perhaps the reviewer below was thinking of one of the other trailheads.

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Hall Ranch
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3 Completed 2 Reviews

Great trail for horse back riding.

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Hall Ranch
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8 Completed 6 Reviews

This is one of my favorite front-range rides. Nice technical climb at the front end after which there is a gentle climb to the top for a loop with beautiful views.

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Lion Gulch
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7 Completed 2 Reviews

This hike was my first one since moving back to Colorado from Arizona. Went with my buddy and it was an awesome hike. We went early in the morning around 10 and it was not crowded at all. We hiked all the way to the top and explored one of the homesteads. The trail is small and enjoyable with a nice stream to follow with a lot of trees. It rained and hailed on us at the top but we hid behind a rock and ate lunch, it was a beautiful scene. Will hike this trail again sometime.

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Lion Gulch
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5 Completed 4 Reviews

One of my favorite hikes, have done it wary and late summer. Trail can get very soggy in early summer (May). Love the variety of the trail and the history with the homesteads!

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Bitterbrush
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3 Completed 1 Reviews

This is not necessarily an easy trail.

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Lion Gulch
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7 Completed 7 Reviews

Such a beautiful hike! It's about 3.14 miles from the trailhead to the kiosk that begins Homestead Meadows, which is very cool to walk through. The beginning of the hike is steep with huge steps. From there it's pretty smooth with with some rocky points. However, at the 2-2.5 mile mark is the hardest park of the hike. A very steep ascent that's very rocky and also has lots of loose gravel so beware of your ankles here. There's lots of stream crossings, I counted six total. I got to the trailhead at 8-815am on a Sunday and the lot had only 5-6 cars. I recommend going at this time because during our descent which was around noon-1pm, the trail got very crowded. Also, people like to bring their dogs on this hike so dogs are everywhere during the afternoon hours. Even more so, the dogs are unleashed even though it CLEARLY says at the trailhead that animals MUST be leashed. Overall, this hike was absolutely beautiful and peaceful in the morning, I'd definitely do it again!

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Button Rock Preserve: Sleepy Lion Trail
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42 Completed 7 Reviews

A nice hike. We hiked this during mid-April so it was a bit muddy in spots and extremely windy at times, but nothing we couldn't handle. We saw a few geese here and there, but otherwise we didn't see a lot of wildlife.

You have to drive up Longmont Dam Road (a dirt/gravel road with a few potholes along the way) for over 2 miles before you get to the trailhead.

The first part of this hike is on a wide dirt road adjacent to the Longmont Dam. About a mile or so in you'll reach a sign where you can turn left onto the Sleepy Lion Trail (2.5 miles to Ralph Price Reservoir) or continue on the dirt road (1 mile to the Reservoir). The dirt road is wide and smooth enough for families, dogs and even strollers if you're willing. The Sleepy Lion Trail is a nice hike through wooded area. We took the Sleepy Lion Trail.

If you continue on the Sleepy Lion Trail, you'll climb uphill through the woods, enter a clearing, then walk down through another wooded area. You'll see the reservoir in the distance. You'll have to walk down the mountain, passed a dam-related building (that pumps out water) and up another steep hill (near a large boulder area) to get to it. There is an easier path that is marked here. This was the hardest part of the entire hike. Once you climb this part of the mountain, you'll meet the dirt road at the reservoir.

From here you can take the dirt road back to the parking area or take the Sleepy Lion Trail. Your choice!

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