Pratt Lake Trail

Pratt Mountain is a early season snow scramble or a winter scramble, Pratt Lake is a strenuous day hike, and Pratt Vista is strenuous snowshoe trip near Snoqualmie Pass. The trail goes through scenic forests and meadows past Pratt Mountain to a secluded lake. Talapus, Olallie, Rainbow, Island, and Lower Tuscohatchie Lake are other lakes that are accessible from the Pratt Lake Trail.

getting there


Take Exit 47 off of I-90, turn north and then west (left) onto Forest Road 9035, and continue 0.4 mile to the Pratt Lake Trailhead (1,900 ft).


Take Exit 47 off of I-90 and turn north and then west (left) onto Forest Road 9035. If the road is plowed continue on to the Pratt Lake Trailhead. If not, park on the frontage road near the freeway interchange. Avoid parking in the interchange to prevent having your car towed.

on the trail (day hike)

Pratt Lake

Take the Pratt Lake Trail to a junction at 4,200 ft, taking the right fork to continue on to Pratt Lake.  It's 11 miles and 2,300 feet of elevation gain round trip.

Pratt Mountain

Take the Pratt lake Trail to a junction at 4,200 ft.  Take the right fork onto the Mount Defiance trail.  When the trails begins to cross a boulder field (~0.5 mi), head up (right, north)  the boulder field to the summit.  It's  11 miles and  3,200 feet of elevation gain round trip.

Approach & Ascent (scramble)

In April and May, Pratt Mountain may be done as a snow scramble. From December to March it is a winter scramble.

Follow the Pratt Lake Trail until the intersection with the Olallie Lake Trail. Turn onto this trail, or simply go cross-country to cross the outlet stream from Olallie Lake. Talapus Lake Trail joins it just after the crossing. Shortly before the lake, head steeply uphill towards the saddle to the east of the southeast trending ridge of Pratt Mountain. Follow the ridge to the summit at the north end.

Snowshoe Routes

Pratt Vista is the ridge due north of Olallie Lake between West Granite and Pratt Mountains. From the trailhead, follow the route of the summer trail—it is easy to follow until at 3,500 ft. At 3,800 ft and SSE of Ollalie Lake, follow the route of the summer trail as it heads north around Ollalie Lake. At ~4,000 ft and northeast of the lake, the summer trail bends to the left. Leave the trail here and ascend north to the ridge.  If avalanche conditions are “considerable” or higher, keep to the left to stay more in the trees, otherwise, keep right to have more open terrain.  Upon reaching the ridge, enjoy the view of Pratt to the west, Kaleetan to the north, and Tusk O’ Granite to the east. Follow the ridge west then southwest to just past the lowest spot on the ridge at 4,150 ft.  Turn southeast and descend the forested slopes to the outlet of Ollalie Lake and retrace your route to your car.

Information FOr leaders

Permit information

As of 2017, the Snoqualmie Ranger District considers Mountaineers trips and courses to be "nominal use". Leaders should print and copy this designation letter to show rangers they may see on trail or carry a digital copy on their phone.

  • Difficulty: Technical 3, Strenuous 3, Strenuous, Winter Scramble
  • Length: 11.0 mi
  • Elevation Gain: 3,200 ft
  • 5,099 ft
  • Green Trails Snoqualmie Pass Gateway No. 207S
  • USGS Bandera
  • USGS Snoqualmie Pass

Upcoming Activities

Basic Snowshoe - Pratt Lake Trail

Snowshoeing Trip
Our objective for the day will be Olallie Lake. This route is AVALANCHE-FREE so no
Sun, Jan 19, 2020
2 participants 0 leaders
Registration closed Jan 17
Seattle Branch

Winter Scramble - Pratt Mountain

Scrambling Trip
Difficulty: Technical 3, Strenuous 3, Strenuous, Winter Scramble
Sat, Jan 25, 2020
5 participants on waitlist
Registration closes Jan 23
Seattle Branch

CHS Tacoma October Graduation Hikes - Pratt Lake Trail

Day Hiking Field trip: Conditioning Hiking Series
Trip will initially open to Tacoma Branch Conditioning Hiking Students. Trip will open for registration
Difficulty: Strenuous
Sat, Oct 31, 2020
No Prerequisites
8 participants
Registration opens Sep 15
Tacoma Branch
Trip Reports

This is a list of titles that represent the variations of trips you can take at this route/place. This includes side trips, extensions and peak combinations. Not seeing a title that fits your trip? Log in and send us updates, images, or resources.

  • Pratt Lake
  • Pratt Mountain
  • Pratt Vista
  • Olallie Lake
  • Talapus Lake
  • Talapus & Olallie Lakes
  • Rainbow & Island Lakes
  • Lower Tuscohatchie Lake

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