The Nicasio Loop is a quintessential Marin County road ride that showcases the best of West Marin’s rolling hills, pastoral landscapes, and scenic reservoirs. This moderately challenging loop offers sustained climbs, exhilarating descents, and quiet country roads.
The Route
Starting from Fairfax, you’ll wind through the charming streets of San Geronimo Valley before tackling the steady climb up to Nicasio Reservoir. The route features smooth pavement throughout, making it perfect for road bikes and gravel bikes alike.
Highlights
- Nicasio Reservoir: Stunning water views and peaceful surroundings
- Rolling Hills: Classic Marin terrain with rewarding climbs
- Quiet Roads: Low traffic country lanes
- Pastoral Views: Ranch land, cattle, and open spaces
- Descent to Nicasio: Fast, smooth downhill into the valley
- Café Stop: Historic Rancho Nicasio available for refreshments
What to Expect
- Distance: 28 miles round trip from the shop
- Elevation Gain: Approximately 2,000 feet
- Surface: 100% paved roads
- Traffic: Light on most sections, use caution on busier roads
- Scenery: Mix of forested sections and open ranchland
Best Season
Year-round riding, though spring offers the greenest hills and wildflowers. Summer mornings provide the best weather before afternoon heat. Fall brings golden hills and crisp air.
What You’ll Need
- Road or gravel bike with good climbing gears
- Water: 2-3 bottles recommended
- Snacks: Energy bars or gels for sustained effort
- Spare tube and tools: Self-sufficiency important on quiet roads
- Layers: Weather can change, especially near the reservoir
Local Tips
- Start early to avoid afternoon winds
- Stop at Rancho Nicasio for post-ride refreshments
- Watch for cattle on open range roads
- Descents can be fast - control your speed
- Shoulder is narrow in some sections - stay alert for cars
- Beautiful photo opportunities at the reservoir overlooks
Ride Variations
- Shorter Loop: Turn around at Nicasio Reservoir (20 miles)
- Extended Route: Continue to Point Reyes Station (45+ miles)
- Gravel Option: Connect to Platform Bridge Road for mixed surface riding
Terrain Breakdown
Paved
100%