Media Maratón de Buenos Aires (21K)
The Lowdown
The Media Maratón de Buenos Aires, popularly known as the 21K de Buenos Aires, is one of the largest and most prestigious half marathons in Latin America. First held in 1989 and organized by the Asociación Ñandú (Carreras y Maratones Ñandú), it has carried a World Athletics Label since the 2021 edition and draws a record field of runners from more than 30 countries. The fast, mostly flat 21.097 km circuit starts and finishes at Avenida Figueroa Alcorta and Dorrego in the Palermo neighborhood and winds through the city center, passing iconic landmarks including the Planetario Galileo Galilei, the Rosedal de Palermo, the Teatro Colón, the Obelisco and the Casa Rosada. Wave starts at 8:00 a.m. and a cool late-August (Southern Hemisphere winter) climate make it one of the fastest and most sought-after PR courses in the region.
Race Day
Weather Forecast
Elevation
Terrain Profile
Relatively flat course
Participants
Field Size
World-class event
Crowd Rating
Spectator Support
Legendary crowd support
Av. Figueroa Alcorta y Dorrego (start/finish, Palermo)
Planetario Galileo Galilei
Rosedal de Palermo
Teatro Colón
Obelisco
Casa Rosada
Other distances available during the event weekend:
Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina
AR
Average rate for 3-star accommodations near the start line
Eligibility
- Runners must be at least 18 years old on race day
Required Documents
- Medical certificate clearing the runner for the 21K distance
- Valid photo identification (DNI or passport)
Entry Methods
- Online registration via ticketear.com.ar
Cancellation & Refund Policy
Review the official terms (bases y reglamento) on the organizer's site before registering; registrations are generally non-refundable and non-transferable.
World Athletics Label race since the 2021 edition (World Athletics / former IAAF certified course of 21.0975 km).
Organized by the Asociación Ñandú (Carreras y Maratones Ñandú); first held in 1989.
2025 edition set a participation record of more than 27,000 runners from 32 countries; the 2026 field is marketed at roughly 30,000.
Registration platform: ticketear.com.ar. The 21K is a separate event from the full Maratón Internacional de Buenos Aires (42K).
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Community
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