Cambridge Half Marathon + 5K
Cambridge Half Marathon + 5K logo

Cambridge Half Marathon + 5K

Cambridge, Massachusetts, United States View on map
Oct 31, 2026 – Nov 01, 2026 (America/New_York local time)
Running

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.

Oct 31, 2026 5K 10:00 AM
$45.00
Open

Cambridge 5K Charity Runner

Participants have 1-hour net time to complete the 5K.

Oct 31, 2026 5K 10:00 AM
$45.00
Open

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.

Oct 31, 2026 5K 10:00 AM
$210.00
Open

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.

Oct 31, 2026 5K 10:00 AM
$210.00
Open

Cambridge Half Marathon

Participants have three hours net time to complete the half marathon.

Oct 31, 2026 Half-Marathon 7:00 AM
$135.00
Open

Cambridge Half Marathon Charity Runner

Participants have three hours net time to complete the half marathon.

Oct 31, 2026 Half-Marathon 7:00 AM
$135.00
Open

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.

Temp (°C)
Minimum temperature (race-week average) 5.3° / Maximum temperature (race-week average) 14.5°
Feels Like (°C)
Minimum feels like — heat index / wind chill (race-week average) 1.9° / Maximum feels like — heat index / wind chill (race-week average) 14.1°
Peak wind (km/h)
Strongest wind of the day (race-week average)
20.3
Precip (mm)
Precipitation over the day (race-week average)
1.7mm
Humidity
Mean relative humidity (race-week average)
72.1%
Sunrise
Sunrise at the start line on October 31, 2026 (EDT)
Sunset
Sunset at the start line on October 31, 2026 (EDT)
Daylight
Hours between sunrise and sunset on race day
10h 22m

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.

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Other races near Cambridge

Different organizers, within 40 miles, in the next three months

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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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