Rock CF Thumb Coast Marathon
Rock CF Thumb Coast Marathon runs point to point along Lake Huron, coupling a fast rural-road profile with a cold, exposed November shoreline.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 21, 2026.
Quick facts
- Point-to-point Lake Huron route from Caseville to Port Austin.
- Race proceeds support Rock CF's cystic fibrosis mission.
- Mostly flat rural roads with little wind protection.
- Current Thumb Coast event is not located on Grosse Ile.
About the Rock CF Thumb Coast Marathon
Rock CF uses this Michigan Thumb race to fund cystic fibrosis research and patient support. The marathon starts in Caseville and finishes in Port Austin, correcting the older Grosse Ile location associated with the organization.
Course
The paved point-to-point course follows the Thumb Coast from Caseville to Port Austin. Modest elevation supports steady pacing, but long straight road sections provide little shelter from lake wind.
Race-day weather
Early November on Lake Huron can be cold, wet, and gusty. A favorable wind can help the point-to-point route, while a headwind can dominate the entire race.
Past Rock CF Thumb Coast Marathon dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Sunday, November 8, 2026 | Upcoming | — |
| 2025 | — | Completed | Open results |
Rock CF Thumb Coast Marathon FAQ
When is the Rock CF Thumb Coast Marathon?
The 2026 Rock CF Thumb Coast Marathon is on Sunday, November 8, 2026.
How do I register for the Rock CF Thumb Coast Marathon?
You can register for the Rock CF Thumb Coast Marathon at runsignup.com.
Can I use the Rock CF Thumb Coast Marathon for Boston qualifying?
Marathon Scout marks the Rock CF Thumb Coast Marathon as a Boston qualifier. Check the current Boston qualifying times and confirm current certification with the race before registering.
Featured collections
Send Marathon Scout an official race update
Send us confirmed dates, registration links, results, live tracking, or course changes. Every update is reviewed before it goes live.