Elevation: 10,502 feet (3,201 m)

Prominence: 5,777 feet (1,761 m)

Coordinates: 44.674301, -121.799574

Last Eruption: 950 CE

Volcano Type: Stratovolcano

Nearest City: Marion Forks, SH 22

Range: Mount Jefferson is part of the Cascade Volcanic Arc

First Climbed: 1888 by R.L. Farmer and E.C. Cross

Access to Summit: rock climb

Age: less than 100,000 year old

Native Name: Seekseekqua

Later, the volcano was named after the US president Thomas Jefferson.

The second highest mountain in Oregon is located in the Mount Jefferson Wilderness and due to the ruggedness of the surroundings, Mount Jefferson is one of the hardest summits to reach. Still, it is a popular destination in spite of its remoteness with many activities vailable including: backpacking, hiking, mountaineering, and photography.

The Mount Jefferson Wilderness area has over 150 lakes, through which travels about 190 miles of trails, including 40 miles on the Pacific Crest Trail which skirts the west side of the mountain along Coyote lake in the south, Emma lake in the northwest and Jefferson Park lakes region north of the mountain.

Carnivore include: black bears, bobcats, coyotes, cougars, ermines, long-tailed weasels, martens, minks, raccoons, red foxes, and river otters. Deer include: Roosevelt elk, black tail dees, mule deer. Insectivores include vagrant shrews, water shrews and coast moles. Bats include: little brown bats and silver-haired bats. Hares include pikas and snowshoe hares. Rodents such as the yellow-bellied marmots, mountain beavers yellow-pine chipmunks, Townsends chipmunk, golden-mantled ground squirrel, gray squirrel, Dougles squirrels, mountain pocket gophers north American beaver, deer mich, bushy-tailed woodrats, water voles, jumping mice and porcupines. birds, and various other species inhabit the area.

Birds include: mallards, northern goshawks, sharp-shinned hawks, red-tailed hawks, dusky grouses, grey partridges, killdeers, spotted sandpipers, California gulls, band-tailed pigeons, great horned owls, mountain pygmy owls, common nighthawks, rufous hummingbirds, Northern flickers, pileated woodpeckers, yellow-bellied sapsuckers, hairy woodpeckers, and white-headed woodpeckers.

Eurasian three-toed woodpeckers, willow flycatchers, olive-sided flycatchers, tree swallows, Canada jays, Stellers jays, common ravens, Clarks nutcrackers, black-capped chickadees, mountain chickadees, chestnut-backed chickadees, red-breasted nuthatches, pygmy nuthatches, Eurasian treecreepers, American dippers, wrens, American robins, varied thrushes, hermit thrushes, Townsends solitaires, golden-crowned kinglets, ruby-crowned kinglets, water pipits, blue-headed vireos, western tanagers, Cassins finches, gray-crowned rosy finches, pine siskins, red crossbills, green-tailed towhees, dark-eyed juncos, white-crowned sparrows, golden-crowned sparrows, fox sparrows, and Lincolns sparrows.

Amphibians and reptiles include: long-toed salamanders, California giant salamanders, rough-skinned newts, tailed frogs, western toads, Pacific tree frogs, northern red-legged frogs, Oregon spotted frogs, pygmy short-horned lizards, common garter snakes, and northwestern garter snakes.

As many as half of the lakes contain rainbow trout.

Vegetation at Mount Jefferson is dominated by Douglas fir, silver fir, mountain hemlock, ponderosa pine, lodgepole pine, and several cedar species. Vine maple, rhododendron, purple lupine, yellow lupine, Indian paintbrush, wild strawberries, and red huckleberries are also common around Mount Jefferson.

Above the timber line at 7,200 feet, mountain hemlock and whitebark pine predominate.