Registration Update!!

2027 Race Date Confirmed: Saturday, August 14th

Early registration opens on October 15, 2026!
$5 OFF Registration thru October 31st, 2026!
Plan your race season early and treat yourself to an amazing Eastern Idaho trail run showcasing Harriman State Park.

Start Times:
50k 7a
25k 8a
10k 9a
1k 10:30a

Lunch for all registered runners is included. Please purchase extra meals for friends and family. They are welcome to enjoy The Boys House lawn and lunch.

New for 2027! Help out a fellow runner with registration fees. We have an option for you to donate towards a kitty for registration assistance. Adjust quantity to give more. We thought this could be a helpful way to share the love.

Email us through Ultrasignup with questions!

Course

The courses for all three distances are in a word, beautiful. Wildlife may abound, as you run through forest and meadows, on gravel, two-tracks and pine needle covered single track with stunning views of the Teton Mountains as well as the local valley.

The course is 25K in length. 50K runners are blessed to run 2 loops. Our new 10K distance, follows the Silver Lake Trail after accessing the aid station via two-tracks. The1k Kid's Run follows the gravel path loop through historic Railroad Ranch.
The START/FINISH line for all distances is the East lawn of The Boy's House.
Course reroutes for 2026 make the on-course aid station easier to access for volunteers and runners alike. A course direction change should help runners manage the open meadow sections and lessen the sun/ heat impact.

Updated GPX files for 2027 will be shared. If you have a GPS Watch, USE IT! The course is somewhat of a clover leaf and can be challenging for some. Also, familiarize yourself with the parks own maps & intersections. We promise directional arrows and mileage on signs to keep you on track.

Aid Stations

Nothing has been spared in bringing you the finest in aid station fare. There is one on-course aid station that you will access multiple times during your journey, plus a station at the start/finish line. The food selection is standard aid fare, including cookies, chips, soda, candy, pickles, water, sports drink, etc. Aid station personnel will be at your beck and call. The 10k runners will visit this aid station one time, the 25K runners will visit twice, and the 50K runners will have the privilege of visiting four times. CUPLESS race. Bring your own drinking vessel!

Lodging

Please note that there are no camping facilities inside the park. Yurts and park buildings are available to rent. Visit the parks website for details. https://parksandrecreation.idaho.gov/state-park/harriman-state-park/

There are several forest service campgrounds in the area plus dispersed camping is available. Check out www.recreation.gov for the best campgrounds around Ashton & Island Park, ID or the Caribou-Targhee National Forest website.

Additionally, hotels/motels and nightly rentals can be found from West Yellowstone, MT to Island Park, ID to Ashton, ID from 5 to 45 min from the park.

Check In

Plan for late Friday afternoon into evening at Last Chance Gas Station & early Saturday morning at The Boys House.

Race Festivities

We have reserved the “Boy’s House” for your post-race dining and relaxation. This building overlooks the river, and the east lawn serves as the Start/Finish area.
Once you have completed your journey, join your fellow travelers overlooking the Henry’s Fork River for a meal and beverages. Cheer on runners as they finish, bring a fly rod and fish the river, or hang out.
The Boy's house is a drop bag location. Bringing a chair in the morning is recommended!

To minimize trash and waste, bring your own table service i.e.cups, plates, bowls and utensils for lunch! Pack it in & pack it out.

Rules/Advice

As well-mannered trail runners, it is expected that you will follow the standard protocols regarding trail racing. This will include not disposing of your trash on the ground, not cheating or cutting the course, being very polite to the aid station personnel, other runners, other visitors, and park personnel. You may encounter mountain bikers and horseback riders. Horses have the right of way. If you veer off course, you will need to return to where you left the course and then resume your race. If you just elect to come back to the start, you will be credited with a DNF.

NO DOGS allowed in Harriman State Park, except in the parking areas. Please leave your 4-legged friends at home. They are NOT allowed to run with you.

ADVICE: Mid-August temps the last few years have reached the high-80's. Underestimating the sun & heat leads to dehydration and cramping. Many participants struggle on lap 2 of the 50k from not consuming enough water and electrolytes. The Henry's Fork is accessible for a quick dunk by the bridge.
We do not have an official cut-off time, however completing your chosen distance by 4pm is appreciated!

Course Marking

Course markings will consist of directional arrows, ribbons, signage and "no-go" ribbon.

Refunds and Rollovers

Here is the policy
We will refund your entry fee PROVIDED the race is full and there is someone on the wait list to take your spot.
This refund is available up to approximately 30 days prior to the race.
If the race is not full, then there is no refund. Within 30 days there is no refund available.
How do you get a refund? Just send us a note through the website contact page.
Rollovers
There are no rollovers.
The entry fee you pay is for this year’s race and covers this year’s supplies, fees, insurance, etc.
The best thing to do is to get a refund if the race fills.
Transfers
We DO NOT allow race entries to be sold or transferred to anyone. This is a liability issue.
If you are out running the race and get hurt and can’t communicate with us, we have no idea who you are, who to contact, etc.
Plus it has the potential to really screw up results.
The best thing to do is to get your refund if the race is full and have your friend sign up for the race.

Event's current local time: 2:26 PM MT