[2] Las Trampas Peak and its surrounding environs are located in the Inner Coast Ranges in the San Francisco Bay Area's Contra Costa County, more specifically in the Berkeley Hills subrange.

[3] Like much of Contra Costa County, Las Trampas peak and its surroundings are largely composed of fossiliferous sedimentary rocks from the Great Valley Sequence.

Certain bands in the area contain abundant fossils of prehistoric sea life from the Miocene epoch (~23 mya to ~5 mya)[4][5] Due to its location within a protected wilderness area, Las Trampas Regional Wilderness, Las Trampas Peak and its surrounding hills are home to many species of wildlife including Columbian black-tail deer, Coyotes, Bobcats and numerous species of birds.

[2] The north slope of the mountain is thickly forested with California Coast Ranges mixed evergreen forest, dominant trees include Coast Live Oak, Valley oak and california bay among others.

The east and west sides of the mountain are both mixtures of forest, scrub and grassland, largely depending on the local geology.