Chilcoot is an unincorporated community in Plumas County, California. It lies at an elevation of 5,013 feet. Chilcoot is located 17 miles east of Portola.For census purposes, Chilcoot is included in the census-designated place of Chilcoot-Vinton.The Chilcoot post office opened in 1898, was moved into Lassen County in 1909, and moved back into Plumas County in 1910. Chilcoot may be a Shawnee language name.This region experiences warm and dry summers, with no average monthly temperatures above 71.6 °F. According to the Köppen Climate Classification system, Chilcoot has a warm-summer Mediterranean climate, abbreviated "Csb" on climate maps.