Mount Jefferson (Oregon)
Mountain Stratovolcano in Cascades, challenging alpine climbs
A remote Cascade volcano and the focus of the Mount Jefferson Wilderness, it attracts experienced backpackers and climbers. Visitors find glacial cirques, long alpine approaches and backcountry routes rather than developed amenities.
Mount Jefferson is a 3,199-metre volcanic peak in the Cascade Range of central Oregon, United States. It is one of the state’s tallest mountains and a major landmark of the central Cascades.
Alpine routes and long backcountry trails lead into the mountain’s wilderness, with glaciated high slopes and ridgelines that attract experienced hikers and mountaineers. Scenic views from near the summit include other Cascade volcanoes on clear days.
The mountain is a stratovolcano formed by Cascade volcanic activity and sits within an area designated for wilderness protection to conserve its alpine environment. Recreational use has long focused on non-motorized backcountry travel and mountaineering.
Situated in central Oregon within the Mount Jefferson Wilderness, the peak is northwest of the Cascade crest and is accessed from forested valleys on its flanks.
- Elevation: Summit elevation is about 3,199 metres (10,497 feet), making it one of Oregon's highest peaks.
- Wilderness area: Located within the Mount Jefferson Wilderness, access is by trail and requires backcountry planning and permits where applicable.
How to Get to Mount Jefferson (Oregon) #
Mount Jefferson is approached via the Willamette and Deschutes National Forests. Common starting points include park-and-hike trailheads along US‑20 and forest roads; access requires a vehicle and possibly unpaved roads. Check the U.S. Forest Service (Willamette NF / Deschutes NF) for trail conditions and permits.
Tips for Visiting Mount Jefferson (Oregon) #
- This is a high‑altitude, glaciated peak-only experienced mountaineers should attempt technical routes; hire guides with alpine experience.
- Approach with sufficient acclimatization-trips commonly base from North and South Breitenbush areas.
- Check with the U.S. Forest Service or local ranger district for current trail and climbing conditions; volcanic activity and weather can change access.
Best Time to Visit Mount Jefferson (Oregon) #
Late summer is the typical window for ascent when weather is least severe.
Weather & Climate near Mount Jefferson (Oregon) #
Mount Jefferson (Oregon)'s climate is classified as Tundra - Tundra climate with cold summers (peaking in August) and freezing winters (coldest in March). Temperatures range from -10°C to 14°C. Heavy rainfall (2315 mm/year), wettest in December.
January
January is freezing with highs of -1°C and lows of -8°C. Heavy rain (349 mm).
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February
February is freezing with highs of -1°C and lows of -9°C. Heavy rain (271 mm).
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March
March is the coldest month with highs of -2°C and lows of -10°C. Heavy rain (240 mm).
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April
April is freezing with highs of -1°C and lows of -10°C. Significant rainfall (163 mm).
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May
May is freezing with highs of 2°C and lows of -7°C. Significant rainfall (121 mm).
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June
June is cold with highs of 6°C and lows of -4°C. Regular rainfall (98 mm).
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July
July is cold with highs of 12°C and lows of 0°C. Moderate rainfall (42 mm).
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August
August is cold with highs of 14°C and lows of 1°C. Moderate rainfall (56 mm).
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September
September is cold with highs of 11°C and lows of 0°C. Regular rainfall (95 mm).
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October
October is cold with highs of 7°C and lows of -3°C. Significant rainfall (170 mm).
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November
November is freezing with highs of 0°C and lows of -7°C. Heavy rain (337 mm).
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December
December is freezing with highs of -1°C and lows of -9°C. The wettest month with heavy rain (373 mm).
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