Cambridge Half Marathon + 5K
- Date
- October 31 – November 1, 2026
- Distance
- Cambridge Half Marathon · Cambridge Half Marathon Charity Runner · Cambridge 5K & more
From the Organizer
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.
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
58°
Typical Low
38°
Based on US Climate Normals data from Jamaica Plain, 5 mi from the venue.
Host City
About Cambridge, MA
Population
117,794
as of 2023
Elevation
34 ft
Nearest Airport
BOS
Boston Logan International Airport · 5 mi
Time Zone
Eastern Time
From Endurance Grid
A mid-size host city. Enough lodging and amenities to keep race weekend easy, without big-city sprawl.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Cambridge Half Marathon + 5K, put it on the calendar, and turn “someday” into a start date.
145
Days to train
- Race
- Cambridge Half Marathon + 5K
- Date
- October 31 – November 1, 2026
Coming Up
More Running races near Cambridge, MA
Charlestown Boys & Girls Club's Battle of Bunker Hill 5K Road Race
5K
2 miles away
Summer Classic 5K
5K
Less than a mile away
CRM Invitational: Volunteer Registration
2 miles away
St. Mary’s 5K
5K
3 miles away
From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
The half marathon is the distance where you find out what you're actually made of. Long enough to demand real preparation. Short enough that it doesn't consume your life to train for it. Most people who run their first half describe it as the race that changed their relationship with what they're capable of. Once you cross this finish line, the bar moves. That's not a warning — that's the point.
Race day energy varies by event size, but the finish line feeling is the same regardless. Big races keep the noise going the whole way. Smaller races give you stretches where it's just you and the miles — and that solitude becomes its own kind of fuel.
The half marathon rewards people who show up for the boring training miles.
How long to train: 10–14 weeks. If you're already running consistently, 10 weeks of structured buildup is enough. If you're building from a casual base, give yourself 14.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the Cambridge Half Marathon + 5K?
- Cambridge Half Marathon + 5K is a running race held in Cambridge, Massachusetts on October 31, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Cambridge Half Marathon + 5K?
- Saturday, October 31, 2026 in Cambridge, Massachusetts at 100 CambridgeSide Place, Cambridge, MA. Check the event page for exact start times and wave schedules.
- How do I register for the Cambridge Half Marathon + 5K?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Cambridge Half Marathon + 5K
Oct 31, 2026