This is an approximately 15 mile loop ride with around 3000 ft of elevation gain that begins with a 6 mi. road ride up to the town of Glen Haven. From there the climbing continues on forested singletrack until eventually leading to one of the more technical descents in the northern Colorado front range.

Trail Description

There are 3 major trailheads for this trail. A fourth is up the road towards Estes Park, but travels through private property and I'm not including it here, as I've not used it and am not familiar with it (feel free to contact me for editing priveleges if you'd like to include it.) This route uses the 1st and 3rd trailheads on the road. The middle can be used to shorten the ride.
From the lowest trailhead on CR 43 ride 6 miles to the small town of Glen Haven. Just past town look for a red horse stable and a trailhead sign. Turn left here and climb behind the stable a few hundred feet and look for the trail on the right side of the road.

The trail is just behind these stables.

There are some unfriendly signs that will tell you if you've gone too far.
Once on the trial, find your granny gear and your lungs and climb. The trail is badly eroded in areas and this combined with loose rock, roots and stepups will keep you on your game. Take a breather at Piper's meadow (about an hour in for me)and take in the view.

Piper's Meadow with the Mummy Mountains in the background.

As you continue climbing, stay on the marked trail and pass the trail marked "road," as this will take you down to the middle trailhead on the road. You'll next encounter the summit trail to your right. This is an optional spur that may be worth checking out once, but it is roughly an 1000 foot climb in half a mile of loose rock, hike-a-bike stuff.
Just past this, the fun begins with a long,tricky, technical descent broken up by a little bit more climbing, then back to the starting trailhead.

(Pics are not the techy bits, just the spots I stopped to break.)
Pads would not be out of place for this descent, though a full faced helmet may be more than you'd want to haul up the long climb. I've taken a couple of nasty spills on this trail (dislocated finger this year.)

Getting There

From Loveland, CO take Hwy 34 West towards Estes Park through the Big Thompson canyon. At Drake, CO take a right on County Road 43 towards Glen Haven, CO. 2 miles up the road on the left will be a small turnout parking area at the lowest trailhead. Park here and continue up the road on bike to Glen Haven, where the trail begins. You will pass the middle trailhead along the road to Glen Haven.

When to Bike

Fall may be the nicest time to ride Crosier.

Late spring,summer and fall. This trail will get significant snow in the winter and will not be bikeable until spring.

Images