Rock CF Thumb Coast Marathon 2025

• Scenic course along Lake Huron, starting in Caseville and finishing in Port Austin.
• Supports Rock CF Foundation to aid those with cystic fibrosis.
• Offers full marathon, half marathon, and 5K options, with virtual participation available.
• Organized by Trivium Racing, ensuring a well-managed event.

The Rock CF Thumb Coast Marathon invites runners to explore the scenic beauty of Michigan while supporting a meaningful cause. Situated in Grosse Ile, this marathon blends the charm of a close-knit community with the thrill of a challenging race course. Participants can expect a flat and fast route with picturesque views along the waterways and through lush green landscapes, perfect for those aiming for a personal best or qualifying time. As part of the Rock CF Foundation's mission, the event raises awareness and funds for cystic fibrosis research, ensuring every step contributes to a greater cause. An assortment of race options caters to all levels, with a dedicated fan base cheering you on, adding to the marathon's inclusive and spirited atmosphere.

Expect temperatures between 36-51°F (2-10°C) in early November, with variable winds typical for the season. While humidity is generally lower than in summer, be ready for potential precipitation, as rain or snow may occur. Plan for cooler starts and mild conditions by the afternoon.

The Rock CF Thumb Coast Marathon offers runners a flat, fast route with breathtaking views of Lake Huron, perfect for those chasing personal bests. Starting in historic downtown Caseville, Michigan, the Full Marathon takes participants on a point-to-point journey to the charming downtown area of Port Austin. The Half Marathon kicks off at Sleeper State Park, while the 5K loops around Port Austin, all sharing the same vibrant finish line.

Runners will enjoy the scenic backdrop of Lake Huron throughout the course, adding a picturesque element to the race. The event is steeped in community spirit, supporting the Rock CF Foundation's mission to assist individuals with cystic fibrosis. While the course is largely flat, the November weather may bring cooler temperatures and winds off the lake, adding an extra layer of challenge. Overall, this marathon provides a memorable racing experience with a meaningful purpose.

Grosse Ile, Michigan, offers a charming escape for visitors attending the Rock CF Rivers Half Marathon & 5K. This picturesque island provides a delightful mix of natural beauty and historical intrigue. Begin your exploration at Sunrise Park, where you can kayak or picnic while taking in stunning views of the Detroit River. History enthusiasts will appreciate the Grosse Ile Historical Museum, which showcases the island's rich heritage, and the Grosse Ile Light, a beacon of the area's past.

The island also boasts a vibrant cultural scene, with the Islanders community theater offering engaging performances that highlight local talent. Nature lovers should not miss the Grosse Ile Nature and Land Conservancy, where you can immerse yourself in the island's preserved landscapes through outdoor activities like biking and walking.

When planning your visit, consider the limited public transportation options. Renting a car is advisable to fully explore the island and its surroundings. Accommodations should be booked in advance, especially around event dates, to ensure a comfortable stay. While Grosse Ile is perfect for a peaceful retreat, those interested in the Rock CF Thumb Coast Marathon should head to Port Austin and Caseville in November.