Frost or Fog 10-Mile, 1/4 Marathon & 5K

Experience one of Chico’s most beloved winter runs with the Frost or Fog 10-Mile, Quarter Marathon, and 5K. Explore the stunning and varied terrain of Upper Bidwell Park, where you'll encounter gravel paths, trails, and roads in a captivating and challenging course. For those unable to join in person, the event also offers the flexibility to participate from any location of your choosing.