Buenos Aires Half Marathon

Course & Elevation

The Buenos Aires Half Marathon, also known as the Medio Maratón de Buenos Aires or the 21K de Buenos Aires, is the Argentine capital's annual 21.0975 km road race, held on a Sunday in late August and organised by Asociación Ñandú. The first edition was run on 28 July 1989, with 247 runners in the main race, on the initiative of the former Olympic athlete Domingo Amaison. Start and finish are on Avenida Figueroa Alcorta at Dorrego in Palermo, and in 2026 the race started at 08:00. The route runs from the Bosques de Palermo into the city centre, passing Plaza de Mayo, Paseo Colón and Avenida 9 de Julio, then returns north through Recoleta and along Avenida del Libertador to the finish. The race has World Athletics Label status and serves as a curtain-raiser to the Buenos Aires Marathon in September. The organisers call it the fastest half marathon circuit in the Americas. More than 31,000 runners took part in 2026, a record for the race. On 23 August 2026 Ethiopia's Yomif Kejelcha won in 56:51, a time reported as a world record and awaiting ratification, and his compatriot Fotyen Tesfay won the women's race in 1:03:57; both are course records. The next edition is scheduled for 22 August 2027.