Semi Marathon du New Jersey Fall

New Jersey Fall Half Marathon is held in Manalapan, New Jersey, in Monmouth County, on November 22, 2026, with three road distances: a half marathon (13.1 miles), a 10K (6.2 miles), and a 5K (3.1 miles). The half is the most demanding format of the day. The course alternates between built-up areas and a public park in the heart of central New Jersey.

For runners wrapping up their fall season, the half marathon here works well as a final goal race or as a supported long run at a controlled effort. A 10- to 12-week build with a weekly long run reaching 10 to 12 miles is enough to enjoy the distance. The 10K is a good middle option for anyone who has been training but does not want the volume of a half, and the 5K makes it easy to bring family along. Expect crisp late-November conditions, so warm up thoroughly before the start.