Cambridge Half Marathon + 5K
About this race
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 13.1-mile USATF certified course that starts and finishes at CambridgeSide. It is a fast and flat course along Memorial Drive featuring views of the Charles River, MIT, John W. Weeks Footbridge, Harvard University Stadium, and more.
Pick your distance
Running
Cambridge 5K
Participants have 1-hour net time to complete the 5K.
Cambridge 5K Charity Runner
Participants have 1-hour net time to complete the 5K.
Cambridge Half Marathon + 5K Challenge
Participants have 1-hour net time to complete the 5K & have three hours net time to complete the half marathon.
Cambridge Half Marathon + 5K Challenge Charity Runner
Participants have 1-hour net time to complete the 5K & have three hours net time to complete the half marathon.
Cambridge Half Marathon
Participants have three hours net time to complete the half marathon.
Cambridge Half Marathon Charity Runner
Participants have three hours net time to complete the half marathon.
Typical race-day weather
Based on 6 years of Open-Meteo archive data for this event's race dates in Cambridge, plus the 3 days either side.
The sun rises at 7:16 AM and sets at 5:39 PM local time (EDT) in Cambridge on October 31, 2026 — 10h 22m of daylight.
Course
No course map published yet.
The organizer hasn't released a route for this event, and we don't publish guesses. If you're the organizer, send us a GPX file and we'll draw the profile.
Reviews
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Other races near Cambridge
Different organizers, within 40 miles, in the next three months
Boston 10K for Women
Move for MDS: Boston
Esplanade 5K Run & Walk
Beat the Bay State Team Challenge
🏃 Plan Your Next Race in Cambridge
Find upcoming events by distance:
- Cambridge 5K Races 9 races
- Cambridge Half Marathons 2 races
- Cambridge Running Calendar 2026 13 races
Where this page comes from. Race details were last updated on . We re-check listings regularly and again in the week before race day.
- Entries, prices, waves and inclusions — the event's official registration page
- Temperature and humidity — Copernicus ERA5 reanalysis via Open-Meteo (CC BY 4.0)
- Elevation and terrain relief — Copernicus DEM GLO-90, ESA (CC BY 4.0)
- Comparisons and counts — Race Discovery calendar, 13 Cambridge events
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