Mount Tamalpais via Collier Trail

The Collier Trail is known for its challenging and rugged terrain. Expect steep sections, broken rock, dust, and larger rocks to navigate. It's often described as a significant 'fitness check' due to its gradient, especially when ascending. Some parts can be 'ridiculously steep'.

Absolutely! A highlight of this trail is the discovery of a tiny, isolated old-growth redwood grove in a ravine near Collier Springs. This lush pocket of redwoods stands in stark contrast to the surrounding dry, brushy woodland. You'll also pass by Lake Lagunitas Spillway and Picnic Platform and enjoy views from spots like View from Eldridge Grade and Larkspur & Corte Madera overlook.

The route typically starts near the Railway Grade Fireroad Trailhead at East Ridgecrest Blvd. Parking availability can vary, so it's advisable to arrive early, especially on weekends, to secure a spot.

Regulations for dogs in the Mount Tamalpais Watershed can vary by specific trail and area. It's best to check the official Mount Tamalpais State Park or Marin Municipal Water District websites for the most current rules regarding dogs, including leash requirements and permitted trails, before you go.

Generally, there are no specific permits required for day hiking on most trails within the Mount Tamalpais Watershed. However, some areas or activities might have fees or specific regulations. It's always a good idea to check the official Marin Municipal Water District (MMWD) website, as they manage much of the watershed, for any updates on fees or rules.

The trail can be hiked year-round, but each season offers a different experience. In winter, the redwood grove near Collier Springs is particularly appealing with the sound of a burbling brook. During drier months, the trail can be dusty and exposed. Spring and fall often provide more moderate temperatures and lush scenery.

This route is quite long and challenging, with an estimated duration of just under 6 hours (approximately 5 hours and 58 minutes) for the full 18.3 km (11.4 miles) loop. This duration can vary based on your fitness level and how much time you spend enjoying the scenery.

Given its 'difficult' rating, steep sections, and rugged terrain, the Collier Trail is generally not recommended for beginners. It's considered a demanding hike and a significant 'fitness check' even for experienced hikers.

Yes, the route incorporates sections of several other trails. You'll find yourself on parts of the Tucker Trail, Northside Trail, Gertrude Ord Trail, and Bill Williams Trail, among others, as you navigate this diverse route.

A unique feature is Collier Springs, an opening in the ground where water continually dribbles out, even during dry months. However, this is a natural spring and should not be relied upon as a primary water source for drinking unless properly filtered. Always carry sufficient water for your hike.

Due to the challenging terrain and potential for varied weather, wear sturdy hiking boots with good ankle support. Layers are advisable, as temperatures can change. Bring plenty of water, snacks, sun protection (hat, sunscreen), and a map or GPS device, as some sections can be less maintained.

Beyond the unique redwood grove and Collier Springs, keep an eye out for the Gravity Car Barn, which offers a glimpse into the area's history. The Mount Tamalpais East Peak and Visitors Center is also a significant point on the route, offering facilities and panoramic views.