Grand Rapids Half Marathon
Race Day Weather
Cool start — fast day potential, big temp swing, moderate wind
A cool 43°F at the start line is ideal for fast times — expect to warm up quickly once you're moving. Temps will climb significantly to 60°F by later miles, so expect fading conditions as the race progresses. Moderate winds around 16mph may affect pacing on open sections of the course.
Pace Calculator
Enter a finish time to see what race day does to it.
Get forecast alerts for Grand Rapids Half Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Get your personalized Grand Rapids Half Marathon race plan
A mile-by-mile breakdown of where your time goes, weather-adjusted splits, fueling timeline with aid stations, packing checklist, carb tracker, spectator guide, all built around your goal and race-day conditions.
Race Info
The Grand Rapids Half Marathon runs 13.1 miles on the Sunday of race weekend, starting and finishing at the David D. Hunting YMCA beside the Grand River. The route follows the opening miles of the marathon course through downtown, then continues along Wealthy Street and the Butterworth Park trails by the river before turning back toward the YMCA. The course is mostly flat.
