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Rocky Mountain National Park

Rocky Mountain National Park: Ypsilon Lake Loop

On this 8.4-miler, you'll climb well-marked trails to the tentacle-like flanks of Ypsilon Mountain and its namesake lake, then return off-trail by following a mountain stream past unnamed waterfalls.

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Hike Ypsilon Lake Loop

INFO For information on permits, current trail and camp conditions, and wilderness guidelines, go to nps.gov/romo/planyourvisit/backcountry.htm

PERMIT A wilderness permit is required for all overnight camping in the backcountry. Reservations accepted ($20 administrative fee for permits during peak season). nps.gov/romo/planyourvisit/backcntry_guide.htm

CONTACT Rocky Mountain National Park, (970) 586-1206; nps.gov/romo

Trail Facts

  • Distance: 13.5

Waypoints

YLT001

Location: 40.407383, -105.626213

Lawn Lake trailhead; trail climbs quickly with overlooks to Horseshoe River and Hidden Valley

YLT002

Location: 40.417667, -105.633469

Roaring River cuts a deep path into valley

YLT003

Location: 40.420017, -105.634987

L @ Y onto Ypsilon Lake Trail; cross river

YLT004

Location: 40.42585, -105.645515

Trail remains in woods but levels out

YLT005

Location: 40.439034, -105.662201

Take a breather @ Chipmunk Lake; main trail leads NW; avoid spur paths

YLT006

Location: 40.443813, -105.662277

Peer across Ypsilon Lake @ broad headwall; good spot for nap or yoga

YLT007

Location: 40.443218, -105.661751

Begin off-trail hike; walk on the R side of the stream

YLT008

Location: 40.443184, -105.660797

Splendid waterfall into gorge; continue following animal paths downstream

YLT009

Location: 40.441849, -105.653648

Cross gurgling mountain brook

YLT010

Location: 40.4352, -105.64267

Caution: Dropoffs ahead; veer away from river on descent

YLT011

Location: 40.43195, -105.640335

Merge with the Roaring River; skip across river

YLT012

Location: 40.431149, -105.639801

Turn R onto Lawn Lake Trail; hike 2 mi. back to trailhead