Bear 100 is a 100 miles ultra marathon in Logan, United States. Distance: 161km. Elevation: 6,800m D+. Difficulty: brutal (Challenge Rating 53/100). DNF rate: 28%. Time limit: 36h. Surface: trail. Established 2003.
Bear 100
Logan, Utah, United States
"100 miles through golden aspen forests from Logan to Bear Lake — crossing the Bear River Range at 2900m."
A mountain 100-miler through Utah's Bear River Range timed for peak autumn colors — golden aspens, high passes, and turquoise Bear Lake at the finish.
The Course
From Logan, Utah through the Wasatch-Cache and Caribou National Forests to Bear Lake on the Utah-Idaho border. The course crosses the Bear River Range with multiple passes above 2700m. Beautiful aspen forests in early fall colors, high alpine meadows, and exposed ridges.
mountainous
point-to-point
12
2,920m
Runner Experience
Solid aid station network with 12 stops along the course. Standard ultra fare — food, electrolytes, first aid.
Post-race gathering with awards, food, and shared stories. The ultra community spirit is strong at Bear 100.
Race Day Weather
8°C
-4° – 22°
30%
15%
Late September at altitude. Cold nights with potential for freezing temperatures. Pleasant days. Aspen foliage typically at peak color.
Stats & Records
2003
200
31:00:00
18:05:22
Tommy Manning (2022)
22:30:45
Darla Askew (2023)
Entry
$240
January
months
Lore & Trivia
Bear 100 runs through the Bear River Range along the Utah-Idaho border — some of the most remote and least-visited mountain terrain in the American West. Founded in 2001, the 100-mile course climbs through aspen forests, crosses alpine ridges above 2,800m, and descends into canyons where the only sounds are elk bugling and wind. The race is small (200 runners), the community is warm, and the terrain is quietly devastating — not famous enough to attract spotlight runners, but hard enough to break anyone who underestimates it. Bear 100 is an insider's hundred, loved fiercely by those who know it.
- ▸ 100 miles through the Bear River Range on the Utah-Idaho border.
- ▸ Over 6,700m of total elevation gain.
- ▸ Founded in 2001 — one of the more recent classic American 100-milers.
- ▸ Approximately 200 runners per year — intentionally kept small.
- ▸ Elk bugling during the September race adds a wild soundtrack.
- ▸ Aspen forests turn gold during race week — one of the most beautiful fall courses.
- ▸ The race passes through genuine wilderness — no cell service for long stretches.
Bear is the hundred-miler that nobody talks about and everybody who's run it never forgets.
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Frequently Asked Questions
How long is Bear 100? +
Bear 100 is a 100 miles (161km) ultra marathon with 6,800m of elevation gain. The course is point-to-point on trail terrain.
How hard is Bear 100? +
Bear 100 is rated brutal with a Challenge Rating of 53/100 (Challenging). The DNF rate is 28%. Runners have 36 hours to finish.
How do I enter Bear 100? +
Must have completed a qualifying 100-mile event. Entry costs $240. with a maximum of 300 starters.
What is the weather like at Bear 100? +
Average temperature is 8°C (range -4°C to 22°C) with 30% humidity and a 15% chance of rain. Late September at altitude. Cold nights with potential for freezing temperatures. Pleasant days. Aspen foliage typically at peak color.
Are crew and pacers allowed at Bear 100? +
Crew access is allowed. Pacers are allowed after 65km.
What is the course record for Bear 100? +
The men's course record is 18:05:22 set by Tommy Manning in 2022. The women's course record is 22:30:45 set by Darla Askew in 2023.
What is the average finish time for Bear 100? +
The average finish time is 31:00:00. About 200 runners finish each year. The DNF rate is 28%.
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