Mirror Lake Trail

The Mirror Lake Trail is a high, lonesome traverse that spends nearly its whole length above the trees, drifting south and then east across the alpine shoulder of the Comanche Peak Wilderness. There is no roadside trailhead here — you earn it, reaching this junction with the Flowers Trail only after a good stretch on the Zimmerman and Flowers (or Beaver Creek and Brackenbury) trails. Once you're up, the country opens wide: tundra rolling toward Comanche Peak, wildflowers thick in the short mid-summer weeks, and a spectacular look down into the Mirror Lake basin from the overlook near the Rocky Mountain National Park boundary. From that overlook the trail crosses the boundary and drops into the park, carrying on to the shore of Mirror Lake itself — the trail's true far end, and roughly two and a half more miles of national-park walking beyond the overlook.

Come ready to navigate. For long stretches this trail has no visible tread at all — the route is marked instead by more than 120 rock cairns, and following them carefully is the whole game, especially where the path is simply gone between Flowers and Brackenbury and again from the Monroe Cabin out to the end. Fill up at the Willow Creek crossing, the trail's best water. And because so much of the walking is out in the open, watch the sky: afternoon lightning is the real hazard up here, so start early, turn around if storms build, and save the steep final half-mile to the Comanche Peak Trail for a clear morning.

Trail Facts

Getting There

There's no drive-up trailhead — the Mirror Lake Trail begins deep in the backcountry at its junction with the Flowers Trail. The two practical approaches both start from the Zimmerman Trail (South): either up the Flowers Trail, or via the Flowers, Beaver Creek & Brackenbury trails (with only a short distance on the Flowers and Brackenbury). It can also be reached the long way around from the Hourglass Trail. The whole area is gated by Crown Point Road, which typically opens in late June and is not plowed in winter, so plan for a summer-to-fall window.

Know Before You Go

• Route-finding is the trail. For long stretches there is no visible tread — more than 120 rock cairns mark the general route (about 83 between Flowers and Brackenbury, at least 49 from the Monroe Cabin to the overlook). Follow them carefully and don't push on if you lose the line.
• One mile is unmapped. Between the Roosevelt National Forest boundary and the Rocky Mountain National Park section, roughly a mile of the route crosses high, open country where the tread fades — it is not a maintained trail there, and it shows on the map as a dashed amber line. Carry a map, GPS, and real route-finding sense, and only push on to Mirror Lake if you are comfortable with off-trail alpine travel.
• Lightning is the real danger. Nearly the whole trail is above timberline with no shelter — start early, be off the exposed alpine by early afternoon, and turn around if storms build.
• Wilderness rules apply. No bikes, e-bikes, or motorized use; group size is capped at 12 people and stock combined; camping and fires are prohibited within 200 feet of water or trail, and only self-contained chemical stoves are allowed.
• Water at Willow Creek. The crossing near mile 2.6 is the best source; a few small creeks flow before the Brackenbury junction and beyond the Monroe Cabin. Treat everything.
• Steep finish. The last half-mile from the Mirror Lake overlook to the Comanche Peak Trail is quite steep, running 20–100 ft north of the red RMNP boundary markers — stay with the cairns.
• Dogs & stock. Dogs must be on a hand-held leash with hikers (voice control with stock); stock must be fed only pellets or certified weed-free hay throughout the trip.
• No dogs past the boundary. The final stretch down to Mirror Lake is inside Rocky Mountain National Park, where dogs are not allowed on any trail — if you're bringing a dog, turn around at the RMNP boundary overlook.
• Season. Closed in winter — Crown Point Road isn't plowed and typically opens in late June.