Yes, for the 5K & 10K walkers and runners. These bibs record your official time and your bib number allows us to confirm that everyone has made it back safely at the end of the event. For that reason, we ask that you wear your bib number and be sure to cross the timing line at both the start and finish of the race.
However, bibs are not mandatory (but encouraged) for bikers. The new bike route will not officially be timed. This is a fun community event.