MAMMOTH TUFF

Register at BikeReg.

Registration for the 2025 event will open Feb 11, 2025,

the Tuesday after Rock Cobbler weekend.

Registration closes Sept 10, 2025 @ 6:00 PM PST

You cannot sign up after this time and you cannot sign up in person.

*NO UCI or USA Cycling License is necessary to register, unless registering as an Elite*

MAMMOTH BUFF

Register at RunSignup.

You can sign up in person at the Village for the BUFF.