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The Inaugural 21.5K

location_on

Philadelphia, Pennsylvania, United States

calendar_today 31 May, 2026

directions_run Running

About the Event

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.

Races Offered

The 21.5k (~13.3 miles)

May 31, 2026

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Distance — 13.3 Miles

terrain

Type — Running

timer

08:00

sell

$0.00

Weather Overview

These values represent the 3-year monthly averages for May in Philadelphia.

Temp (°C)

Feels Like (°C)

thermostat 12.6° / 23.2°

wb_sunny 10.8° / 21.4°

Wind (km/h)

Humidity (%)

air 11.0 /

water_drop 67.2%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 12.6° / 23.2°

wb_sunny 10.8° / 21.4°

air 11.0 km/h

water_drop 67.2%

About Philadelphia

Learn more about the host city, Philadelphia.

Philadelphia, routinely referred to as Philly, is the birthplace of American democracy. In Independence Hall and in taverns and other locations around the city, the nation's founders planned and launched the American Revolution, which gave birth to the nation. Visitors interested in U.S. history will also discover that it is a city of firsts: the first library (1731), first hospital (1751), first medical school (1765), first national capital (1774), first stock exchange (1790), first zoo (1874), and first business school (1881).