The Talus Caves Trail in Snoqualmie National Forest leads to a jumble of massive boulders with natural cave passages in the Cascade foothills near North Bend. The two-mile round trip is short but gains 600 feet in a mile, making the ascent steeper than the distance suggests. The payoff is a unique geological feature: room-sized passages between enormous fallen boulders that are cool even in summer.
The talus caves are formed by rockfall from the cliffs above Mount Si, accumulating in a jumbled field that creates natural passages of varying size. They are the closest thing to a cave experience in the immediate North Bend area.
The Route
The trail begins near the Mount Si trailhead complex and climbs steeply through second-growth forest to the talus field. The caves are visible as the trail enters the boulder zone at approximately one mile. Multiple passages are explorable, some straightforward walks and others requiring scrambling or crawling.
A headlamp or flashlight is useful for the darker interior passages. The exploration portion is as long or short as interest and ability dictate. Return on the same trail.
What to Expect
The cave temperature is consistently cooler than outside air, making this a pleasant summer destination when the surrounding forest is warm. The boulder surfaces can be slippery when wet; dry conditions provide the best footing inside the passages.
The short distance makes this a good addition to a North Bend day that might also include Twin Falls or a partial Mount Si hike. The combined driving and hiking day is very manageable from Seattle.
Nearby
North Bend, Washington, is about 5 minutes west with full services. The Mount Si trailhead is nearby for those wanting to add a forest walk. Rattlesnake Ledge, one of Washington's most-hiked viewpoint trails, is about 10 miles east for a very different but equally accessible experience.
Leave No Trace
This trail receives enough use that following Leave No Trace principles is important for preserving the experience for future visitors. Stay on the marked trail to prevent erosion. Pack out all waste. Avoid camping within 200 feet of water sources or the trail. Use existing fire rings only where campfires are permitted, and check current fire restrictions at checking conditions before you go before any visit. The trail and surrounding terrain remain in good condition because previous visitors have respected these norms.
Safety Considerations
The moderate rating reflects the trail's general character under typical conditions. Weather, seasonal snow, and trail conditions can change the experience significantly. Carry the 10 Essentials on any full-day outing. Inform someone of your plans and expected return time before heading out, particularly on longer or more remote trails. Cell service varies throughout Snoqualmie National Forest and may be unreliable in canyon bottoms or remote terrain.