35. Leiden Marathon

The 35th edition of the Leiden Marathon will take place on May 10, 2026 (running final), complemented by hiking events on May 9, 2026. Since its founding in 1991, the Leiden Marathon has become a staple in Dutch running sports ([aims-worldrunning.org](https://aims-worldrunning.org/races/10028.html?utm_source=openai)). Characteristic is the mix of historical old town backdrop and the vast "Green Heart" – a flat, scenic course through polders, windmills, and picturesque villages ([worldsmarathons.com](https://worldsmarathons.com/es/marathon/leiden-marathon?utm_source=openai)). In 2025, over 22,000 people participated, including about 2,300 marathon runners and 2,500 hikers ([worldsmarathons.com](https://worldsmarathons.com/es/marathon/leiden-marathon?utm_source=openai)). The event is not only athletically attractive but also strongly rooted in the region: On May 9, the hiking day will feature routes of 42 km, 21 km, and 10 km, with aid stations every 5 km on the marathon route ([marathon.nl](https://marathon.nl/en/walking-with-van-bemmelen-outdoor/?utm_source=openai)). On race day, May 10, the program includes a marathon, half marathon, 10 km, 5 km (Nightrun), as well as a kids' run of 2.1 km ([marathon.nl](https://marathon.nl/?utm_source=openai)). The flat profiles of the courses offer good chances for personal bests. Although no exact elevation gain is provided, the terrain suggests a largely flat profile without significant inclines, typical for the Dutch polder landscape ([worldsmarathons.com](https://worldsmarathons.com/es/marathon/leiden-marathon?utm_source=openai)).

Marathon (42,195 km), Halbmarathon (21,097 km), 10 km, 5 km (Nightrun), Kidsrun (2,1 km)