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Ultras · US · UT

The Bear 100 Mile Endurance Run

On the calendar
The date is set. Entry has not opened.
Race dateSeptember 24-25, 2027
Duration2 days
Start6:00am
Whenin 343 days
First held1999

Who's going to The Bear 100 Mile Endurance Run?

Free. You can start with nothing.

Free, and always will be. NavRun makes money from race-day planning for runners who want it, never from this. Ultras change constantly, sometimes the morning of. Always confirm with the race director and the official website before you rely on anything here.
Distance 100 Mile
Climb 19,575 ft
Descent 18,445 ft
High point not checked yet
Time limit 36:00:00
Aid stations 13
Started not checked yet
Finished not checked yet
Finish rate not checked yet
The course

Where it goes point to point · 13 aid stations · rust marks a stop your crew can reach

A point-to-point 100 miles from Hyrum Gibbons Mount Logan Park in Logan, Utah, to Conestoga Ranch in Garden City, near Bear Lake. The first climb is the longest, with many more long climbs to follow, and some descents are smooth while others are rocky.

The race

What this one is

A 100-mile point-to-point trail race through the Bear River Range, starting at Hyrum Gibbons/Mount Logan Park in Logan, Utah. For the 2026 edition the course was rerouted so it finishes at Conestoga Ranch in Garden City, Utah, and the entire route now lies within Utah; in earlier years it finished across the state line at Fish Haven, Idaho. About 20,321 feet of climbing, run in late September for the fall color and cooler weather, with a 36-hour time limit.

First run in 1999. The name honors Old Ephraim, a grizzly bear that once roamed the Wasatch-Cache and Caribou National Forests; his gravesite sits a few miles off the course, and the race's overall winners are crowned 'King and Queen of the BEAR 100' in his honor. It is the closing race of the informal Rocky Mountain Slam (with Hardrock, Leadville and Wasatch, among others, as the other qualifying races). The course has been modified twice for winter conditions since 1999, including a same-week reroute in 2006. For 2026 about 25% of the route was changed: the finish moved from Fish Haven, Idaho, to a new venue at Conestoga Ranch in Garden City, Utah, Logan Peak aid was moved and the early miles swapped from the South Syncline to the North Syncline trail, Franklin Basin aid moved to a larger roadside site, and Gibson Basin, Beaver Creek and Ranger Dip aid stations were replaced by new Peter Sinks and Burnt Fork aid stations plus a water stop between them.

Getting in

Getting in Entry, lottery and what the race asks of you before race day.

Lottery
not checked yet
Lottery opens
not checked yet
Lottery draw
not checked yet
Field cap
not checked yet
Registration
not checked yet
Qualifying
Finish an official 50 miler in under 16 hours, or finish any official 100K, 100 or 200 miler under its cutoff, within the four years before registering. Backyard races where you cover 50+ miles also count. For 2027 the window is December 1, 2022 to December 1, 2026. Ironman races are not accepted, and a DNF at mile 50 or 75 of a 100 miler does not count. bear100.com
Minimum age
not checked yet
Transfers
not checked yet
Deferrals
not checked yet
Crew access, pacers and drop bags

The rules that shape your day Anything marked "not checked yet" is a gap in what we hold, never a no from the race.

Crew allowed
Yes bear100.com
Vehicles per runner
1 bear100.com
Pacers
Yes, from mile 37.50 bear100.com
Muling
Not allowed bear100.com
Drop bags
Yes bear100.com
Cupless
Yes bear100.com
Course marking
Fully Marked bear100.com
Night running
not checked yet
Dogs
Not allowed bear100.com
Headphones
not checked yet
Crew rules
One crew vehicle per runner at every aid station. Crew includes family, friends, pacers, helpers, supporters and photographers. Runners choose Right Hand Fork or Temple Fork (not both) for crew access, and a crew pass handed out with the bib is required to park there. Tony Grove has its own day-of-race pass, collected at Franklin Basin. Crewing outside the allowed aid stations is a disqualification. bear100.com
Pacer rules
Pacers are allowed from Right Hand Fork (mile 37.5) to the finish. Runners over 60 may have a pacer from the start. Only one pacer at a time, except in the final mile. Pacers may not carry food, water or equipment for their runner. Vehicle or bike pacing is not allowed. bear100.com
Drop bag rules
Drop bags are left at the start on Thursday afternoon and are carried to the aid stations marked YES on the chart. Keep them a reasonable size. All bags are delivered to the finish line on Saturday. bear100.com
Cutoff philosophy
not checked yet
Aid stations

Every stop, and what you get there ● yes   ○ no   ? nobody has checked   – does not apply to this race

Mile Station Cutoff Crew access Bag Pacer Med To next
0.00 Start
4,852 ft
? ● ○ ○ ? 10.00
10.00 Logan Peak
8,868 ft
10:00am ○ ○ ○ ? 10.00
20.00 Leatham Hollow
5,140 ft
1:00pm ● ● ○ ? 8.50
28.50 Upper Richards Hollow
7,490 ft
4:30pm ○ ○ ○ ? 9.00
37.50 Right Hand Fork
5,551 ft
7:30pm ● ● ● ? 8.00
45.50 Temple Fork
5,837 ft
10:30pm ● ● ● ? 6.50
52.00 Tony Grove
7,980 ft
1:00am ● ● ● ? 10.00
62.00 Franklin Basin
6,717 ft
5:00am ● ● ● ? 8.50
70.50 Logan River
7,280 ft
8:30am ○ ● ○ ? 6.00
76.50 Beaver Mountain
7,269 ft
11:00am ● ● ● ? 7.00
83.50 Peter Sinks
8,240 ft
1:30pm ○ ○ ○ ? 8.50
92.00 Burnt Fork
7,715 ft
4:00pm ● ● ● ? 8.00
100.00 Finish
5,969 ft
6:00pm ● ● ● ? ?
Driving your crew

Getting your people there 8 stops with directions the race published.

Leatham Hollow mile 20.00 cutoff 1:00pm

About 1 mile past the turn-off from the canyon road, you will reach the end of pavement. You may be asked to stop and park near the gate and walk up the road 1/4 mile to the aid station. We can't park everyone at the Aid Station as there is limited parking there. Don't block the road. There are usually cows roaming around too, so watch out.

Parking. Parking is limited at the aid station. Crews may be asked to park near the gate and walk 1/4 mile up the road.

bear100.com
Right Hand Fork mile 37.50 cutoff 7:30pm

Crews may access ONLY 1 of these aid stations (RHF or Temple Fork). Runners will be given a special crew sign during race check-in that will allow them to park at the assigned Aid Station.

Parking. A special crew pass is required to park. Large vehicles are not recommended.

bear100.com
Temple Fork mile 45.50 cutoff 10:30pm

DO NOT PARK ON HIGHWAY 89 AT TEMPLE FORK. You will be cited by the Highway Patrol. NO CREWS ALLOWED UNLESS YOU HAVE A PASS! You may drop off a pacer but you may not pick up a pacer. The area for dropping off pacers is right after you turn off the highway.

Parking. A special crew pass is required to park. Large vehicles are not recommended. Do not park on Highway 89.

bear100.com
Tony Grove mile 52.00 cutoff 1:00am

After leaving Right Hand Fork or Temple Fork you must first drive up the canyon to the Franklin Basin Aid Station. You must wait there until you are allowed to get the TONY GROVE PASS. From the Franklin Basin Aid, turn right on Highway 89 back down the canyon (South) and turn right at the Tony Grove turn-off. Take the immediate left and head up the road for 6 miles. The Aid is at the "backcountry trailhead". It is on your left, near the end of the road, just before arriving at the campground and lake parking lot.

Parking. A separate Tony Grove parking pass is handed out at Franklin Basin and is required to park.

bear100.com
Franklin Basin mile 62.00 cutoff 5:00am

Head down the canyon back to Highway 89. Turn left (north) on Highway 89 and continue up the Canyon about 3 miles to the Franklin Basin Road, turn left. The parking lot is on your left.

Parking. The Franklin Basin parking lot is also used for carpooling, and has a Starlink hotspot from 12:30 pm until 10:00 pm.

bear100.com
Beaver Mountain mile 76.50 cutoff 11:00am

From the Franklin Basin Road, go back to the Logan Canyon Highway, turn left (east) and go about 3 miles to the Beaver Mountain left turn. It is about 1-½ miles up the paved road to Beaver Mountain. At the entrance to Beaver Mtn, turn right and then head straight towards the Lodges. The aid station is NOT in the main lodge but in a smaller lodge (ski patrol lodge) to the north of the 2 main lodges.

Parking. One crew vehicle by the lodge. A second vehicle must be left at the Overflow Dry Camping area, at Sink Hollow, or elsewhere.

bear100.com
Burnt Fork mile 92.00 cutoff 4:00pm

From Beaver Mountain Aid, go back down to the Logan Canyon Highway, and turn left. It is about 5 miles to the "Sink Road". Turn right onto this dirt road, and go about 1.25 miles, and the aid station will be on the left. Passenger cars can make the journey without a problem.

Parking. One crew vehicle.

bear100.com
Finish mile 100.00 cutoff 6:00pm

Head back to the highway and turn right (East). As you enter Garden City turn left (north) on 300 W (first stoplight). You will see Conestoga Ranch on your left. Look for the covered wagons. Go to the North (2nd) entrance and park in the big field. DO NOT PARK ON 300W! Garden City prohibits this.

Parking. Park in the big grass field on the east side of Conestoga Ranch, entering from the north entrance. Pacers who leave a vehicle park in the orange area.

bear100.com
Same race, other lines

Other distances and other years

Other years
2026
What it looks like out there

Somebody has been out there with a camera the tables say the climb is long. these say what long feels like.

2 people have been out there with a camera or a microphone.

These are other people's work and we link straight to them. Watching costs nothing and needs no account. More of them: every race we hold, on film.

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Somebody watches it before it goes anywhere near this page. What we are after is footage of this course, on the ground. If it would be just as true of any other race, it is not this.

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Where this came from. Every fact on this page records its source and when we last checked it: 220 sources for this race. Hover a source link to read the sentence it came from.
47% of what we track for a course is filled in. The rest says "not checked yet" rather than guessing.
See something wrong or out of date? Suggest an edit
Ran this race? Tell the next runner what you know
Got footage of this course? Send us the link
Are you the race director? Get in touch and we'll make it right.
Anything else: [email protected]

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.

Ultras change. We will tell you when this one does.

Cutoffs move, races get postponed, lotteries open and close. We read the race's own sources and record where every fact came from. Put your email in and we will send you what changed, and where we read it.

No account, and nothing to cancel.

What happens to your email. Nothing else. I do not sell it, and I will not send you anything except this race changing. One click gets you out.

I keep this catalog because the information is scattered and hard to trust. Telling you when it moves is the same job.