The Inaugural 21.5K
About this race
Set to take place on May 31, 2026 at 8am, the inaugural 21.5K is a half marathon(+) (13.3 miles) event that celebrates the culture and history of Philly.
Meant to complement the Broad Street Run, held on the first Sunday of May each year, the 21.5K takes place on the final Sunday of May, offering participants a final opportunity to take on a longer distance through the city before the summer heat sets in.
The race begins and finishes in North Philly, creating a route that connects neighborhoods, landmarks, and communities across Philly before returning to where it all started.
Participation is limited to 215 runners and (at least) 35 volunteers, for a goal of 250 total participants — celebrating both Philly (215) and America’s 250th anniversary.
Please note: The INAGURAL 21.5K will take place on an open streets course. Pace groups will help keep the community together, but participants are expected to follow all traffic laws and signals at all times, remain aware of their surroundings, and run safely and responsibly throughout the community.
Pick your distance
Running
The 21.5k (~13.3 miles)
Typical race-day weather
Based on 4 years of historical conditions on this event's race dates in Philadelphia.
Course
Route map and elevation profile
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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🏃 Plan Your Next Race in Philadelphia
Find upcoming events by distance:
- Philadelphia 5K Races 74 races
- 10K Run Events in Philadelphia 7 races
- Philadelphia Half Marathons 6 races
- Marathons in Philadelphia 7 races
- Philadelphia Running Calendar 2026 104 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, 113 Philadelphia events
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