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out and backModerate
Lassen Peak via Southeast Ridge Trail is an out and back route covering 4.9 miles with 2,193 feet of elevation gain.
It rates as moderate given its balanced mileage and climb. Plan on 3–4.25 hr of moving time.
Route geometry source: Openstreetmap · © OpenStreetMap contributors · Open Data Commons Open Database License (ODbL) 1.0 · View a source way · Retrieved Jul 30, 2026