Cambridge Half Marathon

OCT-NOV
31-1
2026
This two-day event in Cambridge features a flat, USATF-certified half marathon and a scenic 5K along the Charles River. Both races start and finish at CambridgeSide. The event also includes a fundraising component for numerous charity partners.
31-1 Oct-Nov 2026
13 miles 5 kilometers

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Event Overview

The Cambridge Half Marathon + 5K is a two-day running event in Cambridge, Massachusetts. The races are held at 100 CambridgeSide Place.

Events and Distances

Multiple events are offered:

  • Cambridge Half Marathon: A 13.1-mile race.
  • Cambridge 5K: A 3.1-mile race.
  • Cambridge Half Marathon + 5K Challenge: A combined event for participants who run both distances. There are also charity runner options for each event.

Course Details

Both races start and finish at CambridgeSide.

The Cambridge 5K course is an out-and-back route along the Charles River with views of the Boston skyline.

The Cambridge Half Marathon course is USATF certified and runs along Memorial Drive. The route is described as fast and flat. Views include the Charles River, MIT, the John W. Weeks Footbridge, and Harvard University Stadium.

Charity

The event has a charity fundraising component. It has supported over 66 official charity partners. Since 2017, the event has raised over $1.7 million in total donations. Visit the organization's website for the most recent information.

13 mi
Cambridge Half Marathon
5 km
Cambridge 5k