The best road cycling routes in Alto Bowl Open Space Preserve

The Pan Toll Road via Panoramic Highway offers a challenging road cycling experience that rewards grit with incredible scenery. You'll climb through dense redwood forests, eventually breaking out to panoramic views of the Pacific Ocean, the San Francisco Bay, and the Marin County Hills. The route features continuous, demanding ascents with an average gradient of around 6.8%, making it a true test for your legs.

This moderate 19.3-mile (31.0 km) ride, with 2344 feet (714 metres) of elevation gain, typically takes around 1 hour and 52 minutes. It's best suited for experienced cyclists due to its significant and often relentless climbs, with some sections reaching a steep 15-20%. Be aware that traffic can be moderate to heavy on weekends, and dressing in layers is advisable due to potential temperature shifts.

This route is a key part of the ascent to Mount Tamalpais State Park, offering a comprehensive test of stamina for Bay Area cyclists. On clear days, the expansive views can stretch to the Farallon Islands and even the snow-capped Sierra Nevada Mountains. The Mountain Home Inn provides a great mid-ride stop to appreciate the vistas.

Embark on the Muir Road & Marin Coastal Bikeway loop, a moderate road cycling adventure spanning 25.1 miles (40.3 km). You will conquer 2258 feet (688 metres) of elevation gain, typically completing the ride in about 2 hours and 25 minutes. This route takes you through diverse landscapes, from the cool shade of coastal forests to wide-open ocean vistas. As you ride, you can expect a mix of challenging climbs and exhilarating descents, offering constant engagement. Keep an eye out for the dramatic views of the Pacific Ocean, especially around Muir Beach Overlook, where the scenery truly opens up.

When planning your ride, be aware that sections of Muir Woods Road and Highway 1 can be narrow and winding, often without shoulders, so you will share the road closely with vehicles. To enjoy a more peaceful experience and reduce traffic encounters, consider starting your ride during early weekday mornings. If you wish to pause your cycling to explore on foot, bike racks are available near the Muir Woods National Monument entrance. Always check local conditions before heading out, as road conditions can change.

This loop is notable for its dynamic backdrop provided by the Marin Coastal Bikeway, offering a continuous change of scenery. You will cycle through areas that transition from dense coastal forests to expansive views of the Pacific. The route also brings you close to the ancient redwood forests surrounding Muir Woods National Monument, allowing you to appreciate this unique ecosystem. It presents a rewarding challenge for cyclists seeking a varied ride that combines physical exertion with stunning natural beauty.

Embark on the Sir Francis Drake and Cross Marin Trail Loop, a moderate road cycling adventure spanning 41.7 miles (67.1 km) with a total elevation gain of 2311 feet (704 metres). You can expect to complete this route in about 3 hours and 11 minutes. The journey begins with the serene Cross Marin Trail, winding through cool redwood groves and streamside woodlands alongside Lagunitas Creek, offering a peaceful start before transitioning to the more open vistas of Sir Francis Drake Boulevard, where you might catch glimpses of Tomales Bay.

This loop is situated within Samuel P. Taylor State Park, making it easy to find restrooms along the Cross Marin Trail section. While the Cross Marin Trail offers smooth riding, be aware that parts of Sir Francis Drake Boulevard can have varying road conditions and traffic, so plan your ride carefully for comfort and safety. Connections between the two main sections are clearly marked, such as at Platform Bridge Road, ensuring a straightforward transition.

This route stands out for its unique blend of environments, from the shaded, tranquil paths of the Cross Marin Trail to the more expansive views along Sir Francis Drake Boulevard. In the fall and winter, you might even spot migrating salmon in Lagunitas Creek, adding a seasonal highlight to your ride. The varied terrain and scenery make this loop a notable option for road cyclists looking to explore the diverse landscapes of Marin County.