Captain of the Castle
Captain of the Castle is a running race on August 20, 2026 in Boston, MA.
- Date
- August 20, 2026 (23 days to go)
- Sport
- Running
From the Organizer
Welcome to the Captain of the Castle, an unsanctioned relay race in the heart of Boston, presented by Endorphins Running and New Balance.
As the sun sets over Boston, runners will speed around one of the most storied loops in the city: the perimeter of the Castle Island harbor loop. Four runners, one mile each, to determine who will be the Captain of the Castle.
This is a night to bring the running communities of Boston together. Grab your crew of four and register as a relay team, or sign up solo and we'll place you on a mixed-club team.
There will be many ways to win, see if your team can snag a top prize:
- Captain of the Castle- Fastest Overall Team
- Fastest Women/Non-Binary Team
- Most Team Spirit
- Fastest Mixed-Club Team (4 runners from 4 different run crews)
- Closest to Predicted Time
Afterwards, we'll celebrate the evening at TBD, sharing drinks and stories to cap off an incredible running experience.
FULL DETAILS:
Date: Thursday, August 20th
Race Kickoff: 7pm
Check-in Begins: 6pm
Route: Out and Back - with a loop around Head Island
Meeting Location: Castle Island Beach, South Boston
Parking: At Sullivan's
Waves: TBD (expect 10-15 relay teams per heat)
Afterparty: To Be Announced
NOTE:
**This is an unsanctioned relay race and therefore there will be no road closures. The runner is responsible at all times for their safety, as well as the safety of the other pedestrians and cyclists. In signing up for this race, the runner agrees to be smart and cautious, yielding for others as necessary, in order to create a safe and fun environment for everyone**
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
80°
Typical Low
65°
Chance of Rain
29%
Based on US Climate Normals data from Boston Logan Intl Ap, 2 mi from the venue.
Host City
About Boston, MA
Population
663,972
as of 2023
City Elevation
12 ft
Nearest Airport
BOS
Boston Logan International Airport · 2 mi
Time Zone
Eastern Time
From Endurance Grid
A big city race. Expect multiple lodging options and plenty to do the day before.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Captain of the Castle, put it on the calendar, and turn “someday” into a start date.
23
Days to train
- Race
- Captain of the Castle
- Date
- August 20, 2026
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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.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
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Plan your trip
Make it a Racecation
Coming from out of town? There's more to Boston than race day. We'll help you line up nearby lodging, flights, a rental car, and things to do so you can make the most of your racecation.
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Captain of the Castle
Aug 20, 2026