The clock at Scott Park stopped at 17:58:03. With that reading, Bo Shelby became the first runner to cover the Bighorn Trail Run 100 Miles in under 18 hours, a mark no one had reached in the race's 25-year history. Top honors in the men's race went to Bo Shelby, who became the first person in the race's 25-year history to finish the race in under 18 hours, crossing the line in a new course-record time of 17:58:03.
How the record fell
The event, held in Dayton, Wyoming, sent 269 runners off on Friday morning to complete a challenging out-and-back mountain course within 35 hours and earn their Bighorn 100 buckles. The route climbs from Tongue Canyon Road at 4,275 feet to the turnaround at Jaws Trailhead, mile 48, near 8,800 feet, then returns the long way down the canyon to the finish at Scott Park. It is a course that punishes the ambitious. For a quarter of a century it had held its ground under 18 hours.
Shelby ran to break it. So did the man behind him. Ben Quatromoni also shattered the previous course record and now owns the second-fastest Bighorn 100 time ever, taking second place in 18:10:31. The two of them rewrote the record book on the same night, twelve minutes apart, which speaks to the pace at the front and to the pressure Shelby carried across the closing miles. John Dragon was the third male finisher in 19:48:48 , a further hour and a half back. The gap tells the story: this was a race decided at the top, between two men chasing a barrier rather than each other.
The final stretch offered no relief. From the high turnaround the trail drops through Sally's Footbridge and Dry Fork Ridge before the long descent to the valley floor. Holding sub-18 pace over the last marathon, after fifteen hours already run, is the discipline that separates a fast time from a historic one. Shelby held it.
A step in the trajectory
The result sets Shelby among the fastest names in the discipline. To break a record that had survived every strong field the Bighorn Mountains had thrown at it since the race began is not a matter of a single good day. It is the product of pacing judged to the mile and a body prepared for the descents that break most runners late. On a weekend that featured 58 North American ultramarathons on the UltraRunning Magazine race calendar , his was the performance that reset a standard.
For years the Bighorn 100 had a wall. Bo Shelby walked through it, and left the door open behind him.
