Randi Zuckerberg is best known as the older sister of Meta’s Mark Zuckerberg and one of Facebook’s earliest employees. But over the weekend, she added a different kind of title to her name: FKT holder on one of Mexico’s most grueling trails.
Zuckerberg completed the Baja Sur Traverse — a point-to-point route running from Todos Santos on the Pacific coast to Cabo Pulmo on the Sea of Cortez — in 24 hours, 53 minutes, and 11 seconds, setting a new Fastest Known Time (FKT) on the route. The run covers 82 miles and 13,000 feet of elevation gain across some of the Baja California Sur peninsula’s most remote terrain.
What the Numbers Actually Mean
For context: most runners consider a stretch that gains 250 feet per mile to be seriously hilly. Between miles 17 and 34 of this route, Zuckerberg climbed 6,000 feet — including three consecutive miles at a 30% grade. That’s 2,000 feet of gain per mile, sustained for three miles, in the middle of an 82-mile effort.
She ran 40 of those miles at night. She took one five-minute nap on the trail. She hit sunrise at mile 70.
Ultra running coach Joe Corcione — who runs the coaching operation Everyday Ultra out of Phoenix — paced her for more than 60 miles of the route.
Coming Back From Injury
What makes the achievement stand out even further is the context. This was Zuckerberg’s first ultra-distance effort after returning from an injury — a detail she shared on Instagram when she announced the FKT.
“FKTs are truly the perfect blend of my worlds — entrepreneur, athlete, and mom,” she said. “You plan, problem-solve, push yourself to the limit, adapt when things go sideways, keep moving when you’re tired, and always manage to find a ton of joy in the journey.”
Her brother Mark Zuckerberg congratulated her publicly on Threads.
A Legitimate Ultra Career
Zuckerberg, a Harvard graduate who spent years as Director of Market Development at Facebook before going on to host a weekly SiriusXM show, has been building a serious ultra-running resume. In 2025, she finished the Cocodona 250 — a 250-mile race through Arizona — in 113 hours, 29 minutes, and 45 seconds.
During the Baja Sur FKT, she wore the Mount to Coast T1, a trail shoe she is an ambassador for. The shoe features a LightCELL midsole, Vibram outsole, and a fast-drying upper — all relevant considerations for a 25-hour run that moves through night, heat, and varied terrain.
FKTs don’t come with prize money or podium finishes. They’re self-organized, self-supported efforts where the only competition is the clock and everyone who has ever attempted the same route before you. Setting one on a route as demanding as the Baja Sur Traverse — on a return from injury, no less — is the kind of result that gets attention in the ultra running community for good reason.
