Crystal Lake via Sourdough Gap and Sheep Lake

The primary access point for this route is the Parking lot at Chinook Pass. This is a convenient starting point for the hike towards Sheep Lake and Sourdough Gap.

Portions of this trail system fall within or border Mount Rainier National Park, where dogs are generally not allowed on trails. However, some sections, like the route from Sheep Lake to Sourdough Gap, are outside the park boundary and do permit dogs. Always check current regulations for specific sections you plan to hike.

The best time to hike this route is generally during the summer months, from late July through early September. This is when the meadows are vibrant with wildflowers, and the weather is most favorable. By late August, Sheep Lake is often warm enough for swimming.

Parts of this trail system are within or border Mount Rainier National Park. While day hiking typically doesn't require a specific permit, an entrance fee to Mount Rainier National Park may apply depending on your access point. Backcountry camping within the park does require a permit. It's always best to check the official Mount Rainier National Park website for the most current fee and permit information.

The terrain is varied, starting in shady sub-alpine forest with switchbacks and roots. As you ascend, it opens into wildflower meadows. The path includes both gentle ascents, like the section to Sheep Lake, and steeper climbs, particularly from Crystal Lake to Sourdough Gap. Around the Gap, the terrain becomes rocky, and beyond it, you might encounter talus slopes and mucky sections after rain.

This route offers stunning alpine scenery. You'll pass by beautiful alpine lakes like Sheep Lake and the Upper Crystal Lake. The highlight is often Sourdough Gap, which provides panoramic views of Mount Rainier, Mount Adams, Mount St. Helens, and the Tatoosh Range. Wildflowers are abundant in season, and you might spot wildlife like mountain goats, elk, marmots, and deer.

Yes, a significant portion of this route follows sections of the Pacific Crest Trail (PCT), specifically the PCT - Washington Section I and the Pacific Crest National Scenic Trail #2000. It also utilizes parts of the Crystal Lakes Trail.

The overall difficulty ranges from moderate to challenging. The section to Sheep Lake via the PCT is generally a moderate ascent suitable for less experienced hikers. However, the full route incorporating Sourdough Gap and Crystal Lake involves significant and steep elevation changes, making it a more strenuous and challenging endeavor.

When hiking in sections within or bordering Mount Rainier National Park, be aware of specific regulations. These include restrictions on dogs (generally not allowed on park trails), Leave No Trace principles, and potentially fire restrictions. Always stay on marked trails and respect wildlife. Check the official nps.gov website for the most up-to-date park rules and advisories.

For the most rewarding views, aim to reach Sourdough Gap. The panoramic vistas from there, including Mount Rainier and other Cascade peaks, are truly spectacular. Also, if hiking later in the summer, consider a refreshing dip in Sheep Lake, as its waters become warm enough for swimming by late August.

During the summer months, especially from July to August, the meadows along the trail burst with color. You can expect to see a variety of alpine wildflowers, including vibrant Indian paintbrush, delicate western anemone, and beautiful lupine, among many others.