BTS100 Bromo Tengger Semeru Ultra Run 2027 (Postponed from 2026)

IMPORTANT OFFICIAL POSTPONEMENT: BTS100 2026 will not take place on 7–8 November 2026. The organiser announced on 19 October 2026 that the event has been postponed to 6–7 November 2027, owing to fires affecting several sections of the trail and surrounding areas of Bromo Tengger Semeru National Park. Runner safety, emergency access and the need for ecosystem recovery were cited as reasons.

Options for already registered runners

• Request a refund: The application window is 20–27 October 2026. Email fonesport@gmail.com with the subject REFUND BTS100 2026. The organiser states that 100% of the registration fee is refundable; entrants who have already collected their race pack incur a Rp150,000 deduction for the bib and jersey.
• Transfer entry to BTS100 2027: Participants can carry their registrations over to 6–7 November 2027. The organiser states no bib transfer and no refunds for runners who elect to carry forward to 2027. Detailed confirmation procedures are to follow.

2027 race information

The organiser has confirmed the new weekend but has not confirmed the 2027 start timetable, course access, race categories, route profiles, package fees, kit requirements or registration arrangements. Do not rely on old 2026 race times or course maps as if they are valid for 2027. The previously announced 2026 event offered mountain trail races over 8K, 18K, 35K, 70K, 100K and 170K from the Artotel Cabin Bromo venue; these are historical 2026 details only and remain subject to confirmation for 2027.

Official announcement: https://instagram.com/p/Deq6dE5mies/ . Keep checking the official BTS100/F-One Sport channels for updated race instructions.