- Grand Forks Marathon 10K Walk/Run Location: Start at Alerus Center, downtown loop Date: April 25, 2026 Time: 8 AM start Cost: (early bird) URL: [gfmarathon.com]() Part of the annual marathon weekend; family-friendly 10K option on paved trails.³ - RiverWalk 5K Fun Run Location: Sorlie Bridge to Jaycee Park Date: May 3, 2026 Time: 9 AM–11 AM Cost: URL: [und.edu/riverwalk5k]() UND-hosted fundraiser for trails; flat course along Red River.⁴