Half Marathon races near Trenton-Princeton, NJ

Trenton-Princeton Training Ground

Trenton-Princeton, NJ hosts 40 Half Marathon races in 2026 within 80 km of the city centre — upcoming dates, recurring series, and other races nearby, all in one place.

Locals run the Delaware and Raritan Canal Path when they want flat Z2 miles with mileage marks and no drama. Princeton Running Club keeps a deep route list, from the Harrison Street-Towpath Loop at 3.3 miles to the Mercer Park route at 21.0 miles. Fleet Feet Princeton hosts Thursday night group runs at 6:30pm from the shop, with 3 or 5 miles and a walking group. Institute Woods gives summer shade and relatively wide trails. Mountain Lakes and Witherspoon woods bring hilly, twisty singletrack. Revolutionary Mile, Cerebral Palsy Awareness 5K, and Garden of Reflection 5K give the calendar its local bite.

Locals ride the D&R Canal towpath for base miles because it is flat, but certainly gravel. The Delaware and Raritan Canal Path can run 60 or 70 miles if you keep going. Princeton, Trenton, River, & Hills starts in Princeton, rolls through Hamilton and Trenton, heads up the Delaware River to New Hope, and hits the hills between Lambertville and Rocky Hill. The loop is 3 km and gains 491 m. Sourland Cycles sits near the good stuff, with women’s rides Wednesday night and Friday morning, plus beginner-intermediate rides Tuesday and Friday at lunch. Bikes & Beers Hamilton Township is the easy anchor event.

Summer suits runners because Institute Woods is almost entirely shaded, and locals use it for steady miles when the towpath feels exposed. Fall owns the bike vibe around Lake Carnegie, and locals say they definitely miss the fall at Princeton. The D&R Canal towpath stays useful after heavy rain, but muddy spots and puddles can show up. Winter changes both sports toward practical miles, fewer long hangouts, and more routes that start close to town. The Lawrence Hopewell Trail helps when you want mixed paved and unpaved miles around Rosedale Lake. Sourland Mountain Preserve stays a tougher choice with hills, boulders, and vistas.