Mount Tamalpais Mount Tamalpais, viewed from the south Highest point Elevation 2,571 ft (784 m) NAVD 88 [1] Prominence 2,456 ft (749 m) [1] Listing California county high points 55th Coordinates 37°55′45″N 122°34′40″W / 37.929088°N 122.577829°W / 37.929088; -122.577829 Coordinates: 37°55′45″N 122°34′40″W / 37.929088°N 122.577829°W / 37.929088; -122.577829 [1] Geography Mount Tamalpais Marin County, California, U.S. Show map of California Mount Tamalpais Mount Tamalpais (the US) Show map of the US Parent range California Coast Ranges Topo map USGS San Rafael Geology Mountain type Sedimentary Climbing First ascent 1830s by Jacob P. Leese (first recorded ascent) [2] Easiest route Railroad Grade fire trail Mount Tamalpais ( / t æ m əl ˈ p aɪ . ɪ s / ; TAM -əl- PY -iss ; Coast Miwok: /t̪ɑmɑlˈpɑis̺/ , known locally as Mount Tam ) is a peak in Marin County, California, United State