Mailbox Peak (WA)

King County, Washington, United States

9.5 miles (15.4 km) · 3,877 ft elevation gain · Loop · trail · Route

Mailbox Peak (WA) is a 9.5-mile loop route in King County, Washington, United States, gaining 3,877 feet of elevation. The route follows a up-and-over elevation profile. The terrain breaks into 2 distinct sections including 1 significant climb. The longest climb covers 4.7 miles gaining 3,859 feet at an average 15.7% grade. Only 13% of the terrain is runnable — expect substantial hiking throughout. The route opens with a climb and finishes with a descent.