The hike to Ypsilon Lake is a 9-mile round-trip journey along a heavily forested trail in the Mummy Range of Rocky Mountain National Park. Ypsilon Lake sits in a wooded basin along the eastern slopes of Ypsilon Mountain and Mount Chiquita. On this hike, you’ll enjoy views of rugged mountains and Roaring River, a waterfall, and the two lakes found at the end of the trail. Explore the full Ypsilon Lake hike profile below for trail map, driving directions, and more tips and details to help you enjoy this adventure in Rocky Mountain National Park.

Trail Snapshot: Ypsilon Lake in Rocky Mountain National Park

Parking & Trailhead Information for Ypsilon Lake

The hike to Ypsilon Lake begins at the Lawn Lake Trailhead. Several other destinations in this lesser visited section of RMNP known as the Mummy Range, can be accessed from the Lawn Lake Trailhead, including Ypsilon Falls, Lawn Lake, Chipmunk Lake, and the Spectacle Lakes. The parking area is located on Old Fall River Road, just north of the intersection of Old Fall River Road and Highway 34.

The Hike: Ypsilon Lake Trail in RMNP

The hike begins on a 1.4 mile stretch of the Lawn Lake trail before the intersection with the Ypsilon Lake Trail. This initial segment climbs a series of switchbacks. While it may be tempting to cut the switchbacks, they are there for a couple important purposes: to control erosion and to preserve your energy. Because this area of the park has been severely damaged by floods, it’s all the more important to stay the trail. There are areas of unstable terrain.

ypsilon lake trail rocky mountain national park

Ypsilon Lake Trail – Courtesy of Marco Becerra

At 1.4 mile, the Ypsilon Lake trail junction will emerge on the left-hand side of the Lawn Lake trail. Here, the trail crosses the Roaring River–but the bridge has been washed out by a flood in the Spring of 2013. At the time of writing this trail profile (June 2016) the bridge has not been replaced. However, the river can be crossed at low water. It’s easy to underestimate the hydraulic force of a river, so exercise care in crossing. If you’re planning to hike to Ypsilon Lake, it’s important to have a back plan, just in case you run into high water levels at the ford. Typically, the water levels are low, but both snowmelt and heavy rains can change levels quickly.

Approximately 0.5 mile after crossing the Roaring River (@ 2 miles), the trail begins a sustained climb along the ridge of a moraine. This longest segment of the hike leads through thick timber, then crests at 3.8 miles before descending to Chipmunk Lake @ 4.0 miles. The mountain peak reflections in Chipmunk Lake make this worth stopping for a photo.


Chipmunk Lake in RMNP – Courtesy of Brendan Bombaci.

There is a backcountry camping area with two individual sites just past Chimpmunk Lake at 10,640′. Camping permits can be obtained through the RMNP Wilderness offices. The trail from Chipmunk Lake to Ypsilon lake is just 0.5 mile, arriving at Ypsilon’s western shore. Hikers who pause to listen may hear the sounds of Ypsilon Falls. This segmented and tiered cascade can be accessed by crossing a small footbridge, then hiking toward the sounds of the falls along Ypsilon’s northwestern shore.

The return hike follows the same route back to the Lawn Lake trailhead, making this a 9-mile, round-trip journey.

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Tips & Resources for Hiking to Ypsilon Lake in RMNP

  • Packing List: Always pack the 10 Essentials. Download our Hiking Guide to get list and dayhiking packing checklist.
  • Bridge Out: Due to the damage caused by a flood in September 2013, the bridge over Roaring River is missing. Cross only during low water, and see the RMNP flood closures page for updates.
  • Get there early: Parking may be somewhat limited as with many hikes in RMNP area and can get full even early in the morning.
  • Recommended Trail Map: We recommend the National Geographic Trails Illustrated Map which indicates the location of the Upper Chipmunk Backcountry Camping Site, and provides topo information.
  • Colorado Road Conditions: Colorado Road Conditions
  • Photo: We would like to express our gratitude to Roger Dellinger for sharing such an amazing photograph of this hike to Ypsilon Lake in RMNP.
  • After the Hike: Mountain Home Café


Map & Driving Directions

Click for Driving Directions

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Aaron Johnson

Aaron Johnson has been hiking in Colorado for over 20 years. The owner and editor of Dayhikes Near Denver, Aaron writes every trail profile as a local guide who has hiked hundreds of miles of trails along the Front Range and deep in the Rocky Mountains of Colorado.