2 - 3
FATMAP difficulty grade
Thielsen is a stratovolcano like many other Cascade peaks, but unlike most, Thielsen's 9,184-foot summit has been fractured and eroded into a pointy horn of rock--with no crater--that makes for an exciting class 3-4 climb.
It's only 8.8 miles round-trip, but start early: You'll climb 3,700 feet, and the peak's not nicknamed "the lightning rod of the Cascades" for nothing.
You'll also do a bit of routefinding on the way to the summit: The Mt.
Thielsen Trail fades after you cross the Pacific Crest Trail and you'll pick your way up a talus slope by linking cairns.
The last 100-plus feet is a non-technical scramble, but the most cautious hikers pack slings and climbing rope.
On top, enjoy views of Diamond Lake, Mt.
Bailey, and Mt.
-Mapped by Trung Q.
LeTrailhead: US 97 S to OR 138 W.
Go 19.2 miles to parking on right (follow signs to Mt.