Rock CF Rivers Half Marathon

Lace up your shoes for the 15th Annual Rock CF Rivers Half Marathon on Sunday, March 22, 2026, in scenic Grosse Ile, Michigan. This beloved event offers distances for every runner, including a Half Marathon (13.1M), a new 15K, and a 5K, all designed to unite a vibrant community in the fight against cystic fibrosis. Typical race day conditions for this time of year feature pleasant highs around 50°F and lows near 31°F, with a modest 11% chance of precipitation, creating ideal running weather to outrun CF.

The Half Marathon and 15K courses kick off from Grosse Ile Middle School, while the 5K begins at the Grosse Ile Airport, with all races culminating at the Middle School. Runners can anticipate a USATF-certified, mostly flat and fast course, winding along paved roadways that hug the picturesque Detroit River, offering stunning waterfront views. While generally smooth, some segments of the course may present rougher patches, adding a minor challenge to an otherwise swift route. Aid stations, energetically managed by Grosse Ile High School teams, are strategically placed throughout the course, offering water, lemon-lime Gatorade, and GU at multiple points to keep you fueled and hydrated.

What truly sets the Rock CF Rivers Half Marathon apart is its profound mission: 100% of all proceeds directly support the Rock CF Foundation, dedicated to improving the lives of those with cystic fibrosis through fitness, advocacy, and action. Founded by Emily Schaller, who lives with CF, this race is a deeply personal and meaningful experience for many, fostering a powerful sense of camaraderie and hope. Runners consistently praise the gorgeous river scenery and the uplifting atmosphere, making it a favorite for both first-timers and seasoned athletes. For those unable to join in person, a virtual race option allows you to participate from anywhere.