Cambridge 5K
CambridgeSide, Cambridge, MA
Admission: 49.83
The Cambridge 5K is the kickoff to race weekend and will take place on Saturday, October 31, 2026. It's a 3.1 mile course that starts and ends at CambridgeSide. It's a quick out and back along the Charles River that will have you in awe of the Boston skyline. Race starts at 10am.