Turn off Highway 58 (Willamette Pass highway) at a sign for the Hills Creek Reservoir (1.3 miles east of Oakridge). After half a mile on Road 21, continue straight at an intersection onto Road 23. Follow this route for 15 miles of pavement and 4 miles of gravel to a pass beside Hemlock Butte. Turn left at a hiker-symbol sign immediately beyond the pass, drive 200 yards on a spur road, and park at the Vivian Lake Trailhead. Follow the trail about a mile to Notch Lake. Keep on going. At a trail junction about 0.2 mile, turn right on the Mount Yoran Trail (the trail does not ascend Mount Yoran). Follow the trail about 3 miles to Divide Lake ( a good spot to camp, as long as you stay at least 300 feet away from the lake or the nearby streams). Hike cross-country to the northeast of the lake to Mount Yoran's base.
In the winter, the best access to the mountain is to park at Salt Creek Falls. Navigate up the prominent drainage. Follow the RR tracks past a rock cut and then head up when it seems kind of marshy. I would recommend staying climber's left of the gully. This is about a 12 mi. R/T on snowshoes. The North side has the potential to generate some SICK ice routes in the right conditions.--(Winter information courtesy of "zzril").
Hike to the south side of the mountain (via either Salt Creek or Divide Lake) and scramble up the south side. Once you get to the base of the monolith, go up the gully and, once on top of the gully, scramble to the summit. Scramble is class 3-4.
Water is important. In the winter, bring an ice axe and crampons.
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