Mill Valley · Marin County · CA
Horse Hill Fire Road is a 0.4-mile easy (green) trail near Mill Valley, in Marin County, CA. It climbs 8 ft and descends 316 ft, between 60 ft and a high point of 370 ft. Mapped for mountain biking.
All Marin County trailsMarin County mountain bikingCA trails
Trail data © OpenStreetMap contributors (ODbL). Elevation: USGS 3DEP. Updated 2026-07-21. Open the interactive map for routing, weather, and offline use.