A stunning free alternative to Hanging Lake, featuring ice caves, crystal clear stream, and beautiful canyon near Aspen
The Grottos Trail, located approximately 9 miles east of Aspen along Highway 82 in Pitkin County, Colorado, follows the Roaring Fork River through a short but unusually scenic stretch of granite canyon. The trail's signature features are a series of water-sculpted caves and grottos carved into crystalline granite bedrock by centuries of river action, along with a tumbling cascade section known as the Upper Grottos. In summer, ice caves formed by cold air lingering in shaded crevices remain cool long into warmer months — a noticeable contrast to outdoor temperatures.
The main trail follows a loop of approximately 2 miles through spruce-fir forest and across the river on a log bridge. The route descends to river level where the granite formations are most accessible, with flat-topped rock surfaces suitable for riverside picnicking. The clear water runs through sculpted bowls and channels, creating a series of natural swimming holes that attract locals from Aspen throughout summer. The Upper Grottos waterfall section requires a brief scramble upstream from the main loop, but the effort is minimal and rewards with a photogenic cascade in a deep granite slot.
Access is via the well-signed Grottos trailhead parking area directly off Highway 82 at approximately mile marker 60, about 9 miles east of Aspen. No permit is required, and there is no fee for parking or trail access. The area lies within the White River National Forest administered by the Aspen-Sopris Ranger District. Dogs are permitted on leash throughout the trail.
The combination of no fee, no permit requirement, accessible difficulty, and proximity to Aspen makes the Grottos one of the most underappreciated natural attractions in the Roaring Fork Valley. It provides many of the same granite canyon aesthetics as more famous Colorado destinations without requiring advance planning or significant physical effort. The trail is genuinely suitable for families with young children, casual hikers, and visitors who want a scenic outdoor experience without the commitment of a full mountain hike.
Highlights
- Granite grottos and caves carved by the Roaring Fork River — water-sculpted chambers accessible within a 2-mile loop
- Natural swimming holes in clear glacier-fed water flowing through sculpted granite bowls
- Ice caves in shaded crevices remaining cool through summer — a unique micro-climate feature
- Upper Grottos waterfall accessible via a short upstream scramble from the main loop
- Free access with no permit required — significant contrast to the permit-heavy Hanging Lake nearby
Tips for visiting
- The trailhead parking area is small and fills by 9 AM on summer weekends — weekday mornings or arriving before 8:30 AM is advised
- Bring water shoes for exploring the river grottos and swimming holes, as granite surfaces can be slippery when wet
- The Upper Grottos waterfall requires a brief off-trail scramble upstream — follow the river rather than the main loop trail
- Ice caves are most pronounced in June and early July before summer heat reaches the shaded crevices
- The trail is dog-friendly on leash — the river swimming holes are also popular with dogs
- Combine with a trip to Aspen's downtown or the Maroon Bells shuttle for a full-day Roaring Fork Valley itinerary
When to visit
June and July offer peak Roaring Fork River flow for the most dramatic grottos and waterfall, combined with the ice cave effect still pronounced in shaded crevices. Late summer (August-September) brings lower water levels suitable for easier swimming hole access and the most comfortable temperatures. Weekday mornings year-round provide the best chance of a quiet trailhead.
Accessibility
The main loop trail involves minimal elevation change and is manageable for most able-bodied visitors on the forest service path section. The river rock and granite surfaces at the grottos themselves are uneven and require careful footing, making wheelchair access impractical beyond the trailhead. The parking area is unpaved but generally passable for standard vehicles in dry conditions.
Frequently asked questions
Is the Grottos Trail suitable for children?
Yes — the 2-mile loop trail involves minimal elevation change and the flat granite riverside rocks provide safe, engaging terrain for children. The natural swimming holes and ice cave exploration are particularly engaging for young visitors. Standard river safety precautions apply; water levels can be high and fast in May and June during snowmelt.
Is a fee or permit required to visit the Grottos?
No — the Grottos trailhead is on White River National Forest land and access is free with no permit required, unlike the nearby Hanging Lake which requires an advance permit and shuttle fee. This makes it one of the most accessible free outdoor attractions in the Aspen area.
How does the Grottos compare to Hanging Lake?
Hanging Lake is a more visually dramatic geological feature and warrants the effort if permits can be secured. The Grottos offer a completely different experience — accessible river canyon exploration, swimming, and free entry without planning. Visitors who cannot get Hanging Lake permits often find the Grottos a satisfying alternative that locals consider equally worthwhile.