Miller Rock 4x4 Trail

HARD 13 reviews

Miller Rock 4x4 Trail is a 7.1 mile moderately trafficked out and back trail located near Lyons, Colorado that features beautiful wild flowers and is rated as difficult. The trail offers a number of activity options and is best used from March until October. Dogs are also able to use this trail.

7.1 miles
1,709 feet
Out & Back

dog friendly



nature trips

off road driving

scenic driving

trail running




wild flowers




Mix of easy and difficult terrain. Popular hiking area. Lesser used area is entirely land locked by private property except where forest road enters between houses. Fun, challenging terrain. Great views from top of Miller Rock. Popular hiking area. Good for unlicensed vehicles except no place to park at start. Drive in 0.1 miles to small spot. Trail is open all year, weather permitting. You can exit through private Glacier View Ranch on 252A, but you must call ahead a few days to arrange to have them unlock gate. They are friendly to 4-wheelers and do this as a courtesy. Located in Roosevelt National Forest. For current conditions call Boulder Ranger District (303) 541-2500. Steep, rocky climb to enter. Tight trees, but no difficult spots on 523. Choice of moderate or difficult route to Miller Rock. South of Point #3 is steep and very narrow with intimidating ledge near bottom.

off road driving
1 month ago

Nice trail not busy at all we seen three others all day

off road driving
2 months ago

A really fun and challenging trail, but not for the novice or faint of heart!! If you like to “air down” for a smoother ride, find a place in Raymond to pull off and do it. There is no room once you hit the trail. The climb begins almost immediately. Narrow, rocky, steep in parts with sheer drop-offs along some sections. This climb is “difficult” and only high clearance vehicles will make it. No room to pass oncoming vehicles until about half way up, so cross your fingers and hope you are the only one on that section! Once up top, the majority of the trails are “moderate”, although the road up to Miller Rock had large boulders, tree roots, and washed out sections to navigate. I would rate that trail as “difficult”, but fun for the right vehicles. Overall, the trails were in good condition with just a few areas of standing water no more than a foot deep. Not much mud or trail damage due to the recent rains. We spent a good 3 hours exploring all of the trails around Miller Rock and had lots of 4WD challenges along the way. Highly recommend!!

off road driving
4 months ago

Went up Mar 24th 2018. I would call all trails open and drivable to any vehicle equipped to handle a trail rated as “hard”. Moderate amounts of mud and water, at least enough to satisfy my craving until spring really opens up the flood gates. Haha.
One downed tree between the rock, and the camp has the trail fully blocked, and sadly, neither my handsaw nor my straps/winch were up to the job. However, evidence shows many people simply drove around and over on the root side of the tree (myself included), but I don’t know how possible this will be once the snow/ice/ground thaw. One person with a chainsaw could easily clear the way in under 30 min. Perfect spot to camp right there too, so, yeah.
Had a great time once I was was up there. Lots of great views, and lots of fork offs to explore. Only saw one other group up there, and one other vehicle (I assume just exited) so it was unbelievably peaceful.
The gate to the camp was open at the time I was up there, but I didn’t venture in far enough to see if you could make it all the way thru/out of the camp, because I didn’t have permission to be there, so after a quick glance around, I turned back.

All in all, great trail for one so close to the city. I feel the only reason it’s rated as “hard” is because the main road in can be reallllllly treacherous in spots. Especially with a little snowpack and ice slanting you towards the cliff edge.

off road driving
5 months ago

Definitely my favorite offroad trail near me. This trail will definitely give you a decent challenge, and I wouldn’t quite advise stock rigs (saw a stock 4Runner attempting it and beating the heck out of his underbody). Most of the trail is winding, bumpy roads, a lot of which that will keep you holding on tight as you tip to the side toward the drops below. Some really cool rocky areas that change every time due to rain and snow, some that are deeply pitted and will potentially require a spotter. Be prepared for low branches to scratch up your paint, and for the smoothest ride, air down. The map on this site doesn’t map nearly the size of the actual trail, and it’s very easy to get lost on several offshoots.
The “abandoned saw mill” is cool to find, but sadly it’s so incredibly old that the iron stove is barely identifiable as a hunk of rust, and a few planks of wood from the walls and floor still lie around it. Absolutely gorgeous views in the right areas.
One of the directions going toward Miller Rock itself can lead you away, and actually end you up at a gate to “Glacier View Ranch”, which was super creepy to stumble upon at night when no one was around and there’s just a ghost-town of log cabins.
Regardless, amazing trail. Please be respectful to those living around it, especially the people who’s driveway is essentially the entrance.

off road driving
6 months ago

For winter, we only made it in a mile and a half of great terrain! Rocky and snowpacked roads went straight up. Hairpin turns, great time for 2 Jeep Wranglers and difficult to find.

off road driving
11 months ago

It was tough!!! Had to turn around, had no idea it would be that extreme. Am looking to go back when I have another friend with a jeep too, just wasn't trying to break down or get a flat and be helpless. Hard to find the road too, just like the previous comment said, go in between the two cabins from where the gps takes you!

Monday, September 12, 2016

Weather was great! some steep incline to the lookout point, but worth it!

off road driving
Friday, August 19, 2016

Had a little trouble locating the trail as it seems like it is someone's driveway. If you follow the directions this app will give you, turn into the little group of houses that it ends you at and keep following the middle path, this is the trailhead. Trail was fairly narrow in the beginning for my fj cruiser but I made it just fine. Any vehicles wider than an fj would have scratches down the side. Trail opens up after the first bit. The first bit was a great ride but I had to give up since the trail got too hard for my fj (I have a 2.5 inch lift, mud tires, an aftermarket bumper, and aftermarket suspension). I'm sure if you had the guts and a good guide telling you where to place your tires you would be fine. The trail is overall beautiful, well kept, and a fun ride.

off road driving
1 month ago

3 months ago

off road driving
8 months ago

Saturday, February 18, 2017

Thursday, November 03, 2016