Mount Thielsen

Location:  Oregon, USA

Elevation:  9,184 ft. (2,799 m)

Mt. Thielson, an extinct shield volcano is the 7th highest peak in the Oregon Cascades. It’s distinctive horn-like peak and precipitous slopes were created through the heavily erosive forces of glaciation. The spectacular summit pinnacle, comprised of Basaltic Andesite was at one time the interior plug of the volcano. Glaciation and erosion have exposed the plug and created one of the prominent “lighting rod” summit features of the Cascade Range.

In the early days of European settlement, it was called Big Cowhorn to differentiate it from Little Cowhorn to the north. About 1872, it was named Mt. Thielsen by John A. Hulburt of Portland in honor of Hans Thielsen, a prominent railroad engineer and builder.  The Native American name for Mt Thielson was His-chok-wol-as. The first recorded ascent by a European was done by Ensign E. E. Hayden. Hayden was a member of a US Geological Survey party which made a detailed inspection of the southern Oregon Cascades in the summer of 1883.

:) Note: This Summit pairs well with Mount Thielsen for a peak baggers weekend :)

Rare Earth Adventures offers the following climbs on Mount Thielsen:

  • Click here for Trips Calendar
  • Click here to REGISTER for a scheduled Trip