第99回・赤羽トライアル（5km/10km/15km/HALF/30km/フルの部） 2026

From Akabane Station or Akabane-Iwabuchi Station, this event leads directly to the Arakawa Riverbed course: simple, open, and a "flat course!" in the most runner-friendly sense. The 99th Akabane Trial feels like a low-pressure local test day rather than a large-scale event, with "fun run participants welcome!" and beginners clearly in mind. Expect repeated running on the riverbed, the kind of course where pacing is honest because there are no climbs to hide behind. The atmosphere suits runners who want a relaxed effort, a tune-up, or a first step into organized racing. A nice local quirk: "collect 3 stamp cards for a free race," and the nearby Otamayu bathhouse opens afterward, which is exactly the kind of post-run detail regular runners appreciate.