Twin Peaks is an 8,878-foot-elevation (2,706 meter) double summit mountain in Placer County, California, United States.

It is situated on the crest of the Sierra Nevada mountain range, with precipitation runoff from the peak draining east to Lake Tahoe, and west to the Rubicon River via Bear Pen Creek.

Topographic relief is modest as the summit rises over 2,400 feet (730 meters) above Blackwood Canyon in 1.5 mile.

Blackwood and Ward valleys, which each head near Twin Peaks and terminate at Lake Tahoe, were formed by glaciers.

As fronts approach, they are forced upward by the peaks (orographic lift), causing them to drop their moisture in the form of rain or snowfall onto the range.