Running News Daily

On February 20, 2026, American ultrarunner Ashley Paulson delivered one of the fastest performances in the history of ultradistance running, setting a new women’s 100-mile world record at the Jackpot 100 Mile in Henderson, Nevada.

Paulson stopped the clock at 12:19:34, breaking the previous mark of 12:37:04 set by Ireland’s Caitriona Jennings at the 2025 Tunnel Hill 100 Mile. Her performance shaved more than 17 minutes off the record and came during the USATF 100 Mile National Championships, held just outside Las Vegas.

The race unfolded on a 1.19-mile loop around the pond at Cornerstone Park. Cool morning temperatures and calm early conditions created a fast environment, though winds increased later in the day as runners continued circling the course.

To break the record, Paulson needed to average roughly 7:34 per mile for 100 miles. She went out aggressively, covering the early miles near the 7-minute pace and building a significant cushion on record schedule. By the halfway point she had established a comfortable margin, allowing for a gradual slowdown later in the race while remaining ahead of record pace.

Over the final miles the gap narrowed slightly, but Paulson maintained control and crossed the finish line with history secured.

The performance adds another major accomplishment to a résumé that already includes the women’s course record at the Badwater 135, one of the most demanding ultramarathons in the world. Paulson is also familiar with the Jackpot event, having won the race previously.

The course in Henderson is certified, meaning the mark is eligible for official recognition once ratified by the International Association of Ultrarunners.

Paulson entered the race openly targeting the record, and her decisive effort delivered exactly that — a new global standard for the women’s 100-mile distance.