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.

Route facts

Distance	9.5 mi (15.4 km)
Elevation gain	3,877 ft (1,182 m)
Average gain	406 ft per mile (77 m per km)
Longest climb	4.7 mi, 3,863 ft of gain
Steepest climb grade	44%
Runnable	13% of the route
Climbs / descents	1 climbs, 1 descents
Profile shape	Up, then down
Difficulty score	17.8 of 100
Surface	trail
Route shape	Loop
Type	Route

Grade breakdown

Grade band	Share of route
Mild uphill	3%
Moderate uphill	5%
Steep uphill	41%
Mild downhill	1%
Moderate downhill	9%
Steep downhill	41%

Questions about Mailbox Peak (WA)

How much elevation gain does Mailbox Peak (WA) have?

Mailbox Peak (WA) has 3,877 ft (1,182 m) of elevation gain over 9.5 miles (15.4 km). That averages 406 ft of gain per mile.

How difficult is Mailbox Peak (WA)?

The difficulty score for Mailbox Peak (WA) is 17.8 of 100. That is harder than 88.1% of routes at a similar distance. About 13% of the route is runnable at typical trail effort; the rest is steep enough that most runners hike.

What is the longest climb on Mailbox Peak (WA)?

The longest climb on Mailbox Peak (WA) runs 4.7 miles (7.5 km) and gains 3,863 ft (1,177 m). The steepest climb grade on the route is 44%.