Alpine Tunnel loop

The Alpine Tunnel loop is generally rated as a moderate to difficult mountain biking trail. Its primary challenge comes from the high altitude, with sections reaching over 12,000 feet. While some climbs follow old railroad grades, offering a gradual ascent, there are also steep sections and technical, rocky descents. Expect some hike-a-biking on primitive singletrack climbs.

The terrain is quite varied. You'll ride on old railroad grades with gradual ascents, primitive high-alpine singletrack that can be rocky and overgrown, and smooth, flowy, and fast sections on descents. Some dirt roads, particularly near St. Elmo, can be rocky and rutted, with occasional drainage step-downs.

The best time to ride this loop to avoid snow is typically from June through October. If you're hoping to see stunning fall colors in the aspens and alpine tundra, autumn is an ideal time. It's also advisable to ride outside of peak holiday weekends to avoid heavy traffic from ATVs and Jeeps on shared road sections.

The Alpine Tunnel loop is located within Gunnison National Forest. Generally, there are no specific permits or entrance fees required for day-use mountain biking on most trails within the National Forest. However, it's always a good idea to check the latest regulations with the local Forest Service office before your trip, especially if you plan to camp or engage in other activities.

While the trail can be accessed from various points, a common starting point is near the historic ghost town of St. Elmo. Specific parking areas may vary depending on the exact route you plan to take, but St. Elmo offers a good base for exploring the area.

As this trail is located within Gunnison National Forest, dogs are generally allowed. However, they must be kept on a leash at all times to protect wildlife and ensure a pleasant experience for all trail users. Always practice Leave No Trace principles, including packing out all pet waste.

This loop offers a rich blend of natural beauty and history. You'll experience breathtaking high-alpine scenery, winding through basins above 12,000 feet with expansive views of surrounding peaks. Notable natural features include the picturesque Tunnel Lake and vibrant fall colors in autumn. Historically, you'll pass through the ghost town of St. Elmo, see old mining relics, abandoned mines, and cabins. The route also passes by the historic Alpine Station, and informational displays provide insight into the area's past, including the namesake Alpine Tunnel.

The estimated duration for this mountain bike loop is around 3.5 hours of riding time. However, given its challenging nature, high altitude, and the desire to stop and enjoy the historical sites and scenic views, many riders allocate a full half-day or more to complete it comfortably.

Yes, the route incorporates sections of several other trails. Notably, it includes a significant portion of the

CDT - Colorado Section

Collegiate West

Tunnel Lake Trail

Tincup Pass Road

Forest Road 295 Hancock

Forest Road 298 Alpine Tunnel

Yes, several key considerations are important for this high-altitude loop. Be prepared for elevations above 12,000 feet, which can impact physical performance; acclimatization is recommended if you're coming from lower altitudes. Also, be aware that sections of the trail, particularly on shared road segments, can experience heavy traffic from ATVs and Jeeps, especially on peak holiday weekends. Riding outside these times can offer a more serene experience.

The Alpine Tunnel loop is primarily a backcountry experience. While the ghost town of St. Elmo might offer very limited amenities, you should not rely on finding water sources or facilities directly on the trail. It is crucial to carry all necessary water, food, and emergency supplies with you. Always filter or treat any natural water sources you might encounter.