マラソンフェスティバル in 国営昭和記念公園 EARLY SUMMER 2026

Marathon Festival in Showa Memorial Park Early Summer is a June running event inside the large national park in Tachikawa, Tokyo. It offers a half marathon, 10 km, 5 km, and a 1 km parent-child pair race, with the half marathon and 10 km certified by the Japan Association of Athletics Federations. Runners use a certified 5 km loop inside the park, which also hosts the Hakone Ekiden qualifying races. The field ranges from registered athletes chasing official times to general runners, high school entrants in the 10 km, junior high runners in the 5 km, and families in the short pair race. Half marathon pacemakers cover targets from 1:30 to 2:10, aid stations serve Medalist products, and half finishers can check their place in the Runnet age-group ranking.