Seoul Citizens' Marathon for children with cancer

About the Event

The 23rd Seoul Citizens Marathon for Pediatric Cancer Patients (also known as "Helping Pediatric Cancer Patients with Acuon") is a significant charity athletic event scheduled for Sunday, May 10, 2026, in Seoul, South Korea. Operating under the slogan "Let's run for our neighbors one day a year," this event is organized by the Organizing Committee for the Marathon to Help Pediatric Cancer Patients. Since its inception in 2002, the initiative has raised over 800 million won to support children receiving treatment at major institutions like Samsung Seoul Hospital and Severance Hospital. All proceeds from the registration fees are dedicated to assisting pediatric cancer patients in socioeconomically disadvantaged circumstances.

Event Category	Distance	Registration Fee	Souvenir
Half Marathon	21.1 km	₩55,000	Functional T-shirt
10km Run	10 km	₩50,000	Functional T-shirt
5km Run	5 km	₩40,000	Functional T-shirt
3km Walk	3 km	₩35,000	Functional T-shirt

Seoul is the capital and largest metropolis of South Korea, with a city-proper population of approximately 9.4 million residents. As a global tech and cultural hub, the city boasts a highly homogeneous demographic, with 95% of the population being ethnically Korean. However, the foreign resident population has grown to over 240,000, including significant groups from China (approx. 66%), Vietnam (approx. 8%), and the United States (approx. 4%). The median household income in Seoul is approximately ₩5.1 million per month (roughly $3,800 USD). Geographically, the race is held at Mulbit Plaza in Yeouido Hangang Park, located on a large island in the Han River. The terrain is exceptionally flat and paved, following the riverbank trails which are a staple of Seoul's urban recreational infrastructure, characterized by a humid continental climate with mild spring temperatures during the month of May.

The event is limited to the first 5,000 applicants on a first-come, first-served basis, with the application period beginning in January 2026. Participants receive a comprehensive race package including a bib number, guide booklet, finisher medal, and a certificate of completion. The race starts at 08:00 AM near Yeouinaru Station, providing an accessible location for both local citizens and international visitors. For registration inquiries or to participate in the "1m 1 won" donation event, interested parties can contact the committee at (02)2647-4488 or visit the official website.

Races Offered

10km

May 10, 2026

straighten

Distance — 10K

terrain

Type — Running

timer

08:00

sell

$34.00

5km

May 10, 2026

straighten

Distance — 5K

terrain

Type — Running

timer

08:00

sell

$27.00

Half Marathon

May 10, 2026

straighten

Distance — 21.1K

terrain

Type — Running

timer

08:00

sell

$37.50

3km Walk

May 10, 2026

straighten

Distance — 3K

terrain

Type — Running

timer

08:30

sell

$23.75

Weather Overview

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

Temp (°C)

Feels Like (°C)

thermostat 12.3° / 22.2°

wb_sunny 11.0° / 20.2°

Wind (km/h)

Humidity (%)

air 8.9 /

water_drop 71.4%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 12.3° / 22.2°

wb_sunny 11.0° / 20.2°

air 8.9 km/h

water_drop 71.4%

About Seoul

Learn more about the host city, Seoul.

Seoul (서울) is the capital of South Korea. With a population of over 9 million, Seoul is by far South Korea's largest city and one of East Asia's financial and cultural centers. A fascinating blend of ancient traditions and cutting-edge digital technology, home to endless street food vendors and vast nightlife districts, an extraordinarily high-pressure educational system and serene Buddhist temples, a dynamic trend-setting youth culture and often crushing conformism, extraordinary architecture and endless monotonous rows of grey apartment buildings, Seoul is a city filled with stark contrasts, contradictions, and paradoxes. People in Seoul can enjoy various artistic activities such as plays, musicals, and concerts.