Boulderthon reports sell-out of its marathon distance race

Boulderthon reports sell-out of its marathon distance race

Boulderthon, presented by PUMA, has reported a sell-out of its marathon distance race ahead of the 2025 event, taking place on September 28, 2025. Runners will be taking part in the new marathon route that features a net elevation gain cut by about 40%, going from 982 feet to 603 feet. The event organisers are reporting record numbers across the board, with the total field expected to once again surpass previous years with an estimated 15,000 pa…