ROO Race Series
Jun 25, 2027Clancy, MTBackyard Ultra, 50K +2
25K, 7 weeks before race day, 147 mi away, registration open
At a glance
- Date
- Aug 14, 2027
- Location
- Island Park, Idaho
- Distances
- 50K, 25K, 10K, 1K
- Aid stations
- 2
- Registration
- Open until Aug 12, 2027, via ultrasignup.com
Listed from UltraSignup. Checked Oct 19, 2026.
Plan this race for free
2 aid stations are already loaded. Add cutoffs, pacing and the timeline your crew follows. Crew invites and race-day updates come with a Race Pass.
Build my planAbout this race
Buffalo Run Adventures puts on trail races that are unique in location and atmosphere, maintaining the unique culture of trail and ultrarunning while keeping events top notch yet low key and familiar.
Key dates
Registration opens
Oct 15, 2026
Early registration ends
Oct 31, 2026
Registration closes
Aug 12, 2027
Race day
Aug 14, 2027
Pricing
50K/Venti
Early registration, then $130 from Nov 1, 2026
$125
25K/Grande
Early registration, then $100 from Nov 1, 2026
$95
10k/Tall
Early registration, then $60 from Nov 1, 2026
$55
1k/Short
Early registration, then $20 from Nov 1, 2026
$15
Email me updates about Harriman Ultra Trail Runs
Registration openings and major changes, like a new date or a cancellation.
Aid stations
2| Station | Distance | Crew | Drop bags | Cutoff | Supplies |
|---|---|---|---|---|---|
On-course aid station The 10K visits once, the 25K twice, and the 50K four times. There is no official cutoff; completing the chosen distance by 4:00 PM is appreciated. | -- | -- | cookieschipssodacandy+3 | ||
Start/finish station Located at the East lawn of The Boy's House, which is also a drop bag location. There is no official cutoff; completing the chosen distance by 4:00 PM is appreciated. | -- | -- | cookieschipssodacandy+3 |
Entry transfers
Can't race, or need an entry? Post it here so nobody has to ask if it's still available.
Tune-up races
River of No Return Endurance Runs
Jun 19, 2027Challis, ID108K, 55K +1
19.9 mi, 8 weeks before race day, 137 mi away
Straight-line distance
Similar races
Fall Creek Beast
Oct 31Swan Valley, ID50K, Half Marathon
Also 50K, 61 mi from Harriman Ultra Trail Runs, registration open
ROO Race Series
Jun 25, 2027Clancy, MTBackyard Ultra, 50K +2
Also 50K, 147 mi from Harriman Ultra Trail Runs, registration open
Spitfire Ultra Trail Challenge
Apr 17, 2027Menan, ID55K, 30K +2
Also 50K, 46 mi from Harriman Ultra Trail Runs
The Drift 28 & 13
Mar 14, 2027Pinedale, WY28 mi, 13 mi
Also 50K, 105 mi from Harriman Ultra Trail Runs
Straight-line distance
More 50K Races in Idaho
All races in IdahoFall Creek Beast
Oct 31Swan Valley, ID50K, Half Marathon
Spitfire Ultra Trail Challenge
Apr 17, 2027Menan, ID55K, 30K +2
River of No Return Endurance Runs
Jun 19, 2027Challis, ID108K, 55K +1
Races Near Jackson
All races near JacksonHaunted Half Marathon and 5k by Run the Undergrad
Oct 24Rexburg, IDHalf Marathon, 5K
Montana Meltdown
Sep 25, 2027Bozeman, MT24 hr, 12 hr +1
The Drift 100
Mar 12, 2027Pinedale, WY100 mi
The Drift 28 & 13
Mar 14, 2027Pinedale, WY28 mi, 13 mi
Inkom Last Man Standing 1.1
Aug 13, 2027Inkom, IDBackyard Ultra
Over the Top Trail Race
May 8, 2027Pocatello, ID30K, Half Marathon +2
Wyoming Range 100-Mile Endurance Run
Aug 6, 2027Box Y Ranch, WY100 mi
Copper Kings 100
Jun 25, 2027Butte, MT100 mi
Standhope Ultra Challenge
Jul 24, 2027Ketchum, ID100 mi, 60K +1
August Races Nearby
All August racesHURL Elkhorn
Aug 7, 2027Helena, MT50 mi, 50K +1
Race planning
Plan Harriman Ultra Trail Runs with Crewable
Build your aid station plan, organize your crew, and dial in your nutrition strategy. Everything you need to finish strong.
Build my planAre you the race director for Harriman Ultra Trail Runs?
Claim this race to manage registration, volunteers, and race day.