Grand Island Trail Marathon
Race Day Weather
Warm day, steady wind shifts
Runners will face temperatures rising from 61°F at the start to 82°F by the finish, with humidity averaging 67% and a dew point of 59°F. A headwind at 13 mph will provide a challenge throughout the race. Runners should adjust their pace conservatively and ensure proper hydration to maintain performance.
Pace Calculator
Get forecast alerts for Grand Island Trail Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The Grand Island Trail Marathon takes place on Grand Island, a roughly 13,500-acre island in Lake Superior reachable only by ferry from Munising, Michigan. The race offers 50K, marathon, and half marathon distances along the island's perimeter trail, passing 300-foot Jacobsville sandstone cliffs and shoreline views of Pictured Rocks National Lakeshore. The marathon course measures about 27 miles, longer than the standard 26.2-mile distance. Entries are capped at 500 runners combined across all three distances.
