The trail to the top of Lassen Peak begins at the peak parking area at an elevation of 8500 feet. The popular trail is 2.5 miles one-way to the summit. There are many fantastic vistas of the park and surrounding areas from the trail. The summit provides one of the most spectacular views of the Devastated Area, a view from the top looking down. This view is the best vantage point to contemplate the power of the 1914-17 eruptions. The lingering rotten-egg smell of hydrogen sulfide near the summit reminds visitors that Lassen is still considered an active, but dormant, volcano.

There are many switchbacks and the trail can be steep and rocky at times. Hiking boots are recommended. A round trip takes 3 to 5 hours.