Cambridge Half Marathon + 5K
Updated
Saturday, October 31, 2026, first start 10:00 AM, in Cambridge (100 CambridgeSide Place). Distances: 5K. Entry from $45; the 5K goes from $45 to $50 after October 25.
- Date
- Saturday, October 31, 2026 to Sunday, November 1, 2026
- Start time
- 10:00 AM (earliest wave)
- Location
- 100 CambridgeSide Place, Cambridge, MA 02141
- Area
- Boston & Cambridge, Boston
- Distances
- 5K
- Course
- Road or path
- Price
- $45 plus the platform's processing fee
- Next price increase
- Sunday, October 25, 2026: 5K $45 → $50
- Registration
- Open. Opened December 30, online signup closes Saturday, October 31, 2026
How to register
Registration is on RunSignup. Pick your distance, add any extras, and you'll get a confirmation email with your bib details. Sign up by October 25 to pay $45 instead of $50.
Course and race notes
The Cambridge 5K is the kickoff to race weekend! It's a 3.1-mile course that starts and finishes at CambridgeSide. It's a quick out and back along the Charles River that will have you in awe of the Boston skyline. The Cambridge Half Marathon is a 13.
From the race's own listing. Check the race website for the course map and parking.
Source: RunSignup public race API, refreshed 2026-10-17. Details can change; the registration page is the final word.