About Blue Hole Snoqualmie
Blue Hole Snoqualmie is a striking cold spring nestled in Washington's Little Si Natural Area, known for its vivid blue waters and dramatic setting at the foot of Little Si mountain. This primitive swimming hole draws visitors seeking a refreshing dip amid rugged natural beauty and the roar of the Middle Fork Snoqualmie River. The crystal-clear, chilly water offers an invigorating experience, but its powerful currents demand caution.
Getting There
You reach Blue Hole by a short, easy walk of about 2 to 15 minutes from limited parking spots near the trailhead off I-90. The access trail is straightforward but can become crowded on warm days. Due to the small parking area, arriving early increases your chances of finding a spot.
What to Expect
The spring boasts refreshingly cold water and a unique, deep blue pool carved by the river’s flow. The atmosphere is lively, often filled with the chatter of swimmers and hikers in summer, yet the current can be strong and unpredictable. Facilities are minimal—there are no restrooms or amenities, blending you fully into the raw natural environment.
Tips for Visitors
Swim only when currents are low, typically in late summer, and heed posted warnings—recent drownings have resulted in seasonal closures by the sheriff. Bring sturdy shoes for the trail and plenty of water, and avoid swimming after heavy rain or during strong flow periods. Parking is free but limited, so plan your visit accordingly.