Lake Lagunitas Dam – Fish Gulch trail junction loop from Fairfax

If you're looking for a solid, moderate mountain biking route in Marin County that packs a punch without demanding an entire day, the Lake Lagunitas Dam – Fish Gulch trail junction loop from Fairfax is definitely worth your time. This 9.7-mile (15.6 km) loop, rated moderate, offers 1272 feet (388 metres) of climbing and can be completed in about 1 hour and 34 minutes, making it a great option for a vigorous morning ride or an afternoon escape.

What to expect on Lake Lagunitas Dam – Fish Gulch trail junction loop from Fairfax

As you tackle this loop, expect a varied landscape that transitions from lush coniferous forests to rolling hills, often alongside scenic waterways like Lagunitas Creek. The route takes you past the tranquil Lake Lagunitas, the oldest reservoir in the Marin Municipal Water District, offering picturesque views and a chance to spot wildlife like ducks and turtles. While the overall ride is moderate, be prepared for sections that require good fitness, especially around the Fish Gulch junction where choices like Shaver Grade (easy and shaded) or the steeper Fish Grade fire road offer different challenges. It's a fantastic ride for those who appreciate diverse natural beauty and a good workout without extreme technical demands.

Planning your visit

Early mornings are often recommended for riding this loop, especially during warmer summer months, to enjoy cooler temperatures and potentially fewer people on the trails. While specific parking details aren't provided, Fairfax is a common starting point, so plan for street parking or designated trailhead lots. Always carry enough water, particularly on warmer days. This area is part of the Mount Tamalpais Watershed, so be mindful of local regulations and respect the natural environment.

Trail details

• Distance: 9.7 miles (15.6 km)
• Elevation gain: 1272 feet (388 metres)
• Difficulty: moderate
• Estimated time: 1 hours and 34 minutes