The 21K Buenos Aires, officially known as the Buenos Aires Half Marathon, is an annual half-marathon event—21.0975 km—that takes place in Buenos Aires, Argentina. Organized by Asociación Ñandú, it has earned a prominent place in both regional and global running circuits.
Event Details: 2025 Edition
Date: Sunday, 24 August 2025.
Start–Finish: Avenida Figueroa Alcorta & Dorrego.
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Start Time: Around 7:30 AM or 8:00 AM, depending on sources.
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Registration:
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Argentinians: ≈ ARS 77,000
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Foreigners: ≈ USD
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Expo & Kit Pickup:
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Location: Parque Sarmiento (Av. Triunvirato entrance)
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Times: Thurs 21 Aug 10–18 h, Fri 22 Aug 12–20 h, Sat 23 Aug 10–18
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Why It Stands Out
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Fastest Half Marathon in the Americas: The course broke the 1-hour barrier in 2018
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World Athletics Label Race: Certified and recognized on the international racing calendar
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Region’s Largest Half Marathon: One of the most attended and competitive races in Latin America—often drawing over 25,000 runners from many countries
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Elite Field & Prestige: Frequently includes national championships and attracts top-tier international athletes.
21K Buenos Aires
Highlights from the 2024 Edition
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Participation: Over 25,000 registered runners
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Male Podium:
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1st: Gerba Beyata Dibaba (ETH) – 1:00:24
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2nd: Cosmas Mwangi Boi (KEN) – 1:00:25
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3rd: Richard Yator Kimunyan (KEN) – 1:00:43–44
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Top Argentinian: Ignacio Erario—1:01:11, also set a national record for 15 km (43:15)
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1st: Ruth Chepngetich (KEN) – 1:05:58, a new course record
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2nd: Alemaddis Eyayu Sisay (ETH) – 1:07:04
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3rd: Joyce Chepkemoi Tele (KEN) – 1:07:35 International Depth: Athletes from ~35 countries showcased top performances across all categories
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Organization & Atmosphere: “Wave starts” (starting in groups) ensured order, enhanced by music, neighborhood support, and scenic routes that highlight Buenos Aires’ iconic architecture