Like nearby Mount Saint Helena, Cobb Mountain is tall enough to receive winter snowfall.

[3] The mountain has a sub-peak referred to as Cobb Mountain – Southwest Peak with an elevation of about 4483+ feet, (1367+ m) NAVD 88;[4] Southwest Peak lies on the Sonoma-Lake county line and is the highest point in Sonoma County.

Nearby taller peaks like Mount Saint Helena and Snow Mountain can be seen from this summit.

[6] The east end of Cobb Mountain drains into the headwaters of Putah Creek, then into the Sacramento River, the San Francisco Bay, and the Pacific Ocean.

In 1853 he arrived in California and homesteaded in Cobb Valley and went on to become the county assessor and the road overseer for the Clearlake District in 1855.