Rock CF Thumb Coast Marathon

06/22/2026

Most people sign up because they want to run a Marathon, Half Marathon, or 5K. They like the date, the prospective weather, the course.

One of the reasons we're excited about this race is what those miles support.

The Rock CF Thumb Coast Marathon was created in partnership with the Rock CF Foundation, an organization dedicated to improving the quality of life for people living with cystic fibrosis.

Emily Schaller founded Rock CF nearly 20 years ago after being diagnosed with CF herself. Since then, the organization has grown into a community that supports people living with cystic fibrosis through programs, scholarships, research initiatives, and advocacy.

At the same time, Emily, Trevor, and the Trivium Racing team are runners. We care deeply about putting on a race that's organized, welcoming, and worth training for.

Those two things go hand in hand.

You get a great day of running along Lake Huron, and together we help support a mission that's making a difference for people living with cystic fibrosis.

Learn more about the Rock CF Foundation at the link in the comments ⚡️

November 8, 2026

Rock CF Thumb Coast Marathon, Half Marathon & 5K
Sunday, November 8, 2026

06/18/2026

The 2026 Rock CF Thumb Coast Marathon participant sweatshirt is here.

Every Marathon, Half Marathon, and 5K participant receives one.

Last year we heard things like:

"I am obsessed with my sweatshirt."

November 8, 2026

More details at the link in the comments.

Rock CF Foundation + Trivium Racing

*The 2025 shirt is pictured on the right in sand.

06/10/2026

If you've got a time goal in the Marathon or Half this fall, we've got your back.

Beast Pacing is providing pacers again for both distances. They follow some important pacing rules:
- They finish within a minute of their pacing time, and never over.
- They do not bank time.
- They run with an even effort.

Pacers will be wearing a custom pace shirt and will be carrying pace signs. Find your pace goal sign when lining up for the start and stay with the pacer to meet your time goal. You do not need to register ahead of time.

We have a list of pace groups on the website. We're updating it each month as we get closer to race day. We'll drop the link in the comments.

06/03/2026

Global Running Day ends at midnight.

If Rock CF Thumb Coast Marathon, Half, & 5K has been on your radar, today's the day.

Use code **2026GRD15** before 11:59 pm to save on:

• Rock CF Thumb Coast Marathon, Half Marathon & 5K (November 8)
• Dearborn Decades 5K (August 9)
• Growler Gallop Atwater 10 Mile & 5K (September 27)

We'll put the registration link in the comments.

See you on Michigan's Thumb Coast this November.

06/03/2026

Happy Global Running Day! 🏃‍♂️🏃‍♀️ Today only, use code 2026GRD15 to save 15% on your Rock CF Thumb Coast Marathon, Half Marathon, & 5K.

Discount expires at 11:59pm on June 3rd. Join us on November 8th: https://runsignup.com/rockcfthumbcoast

RunSignup provides a simple way to register for races. You can create and manage your race for free.

05/27/2026

We’re looking for passionate, dependable volunteers to help make race day unforgettable for our 2026 Thumb Marathon runners.

We especially need help on the course at aid stations and from course marshalls.

If you’ve ever benefitted from the smile, support, or kindness of a volunteer during a race, now’s your chance to return the favor. Whether you're a runner taking the fall off, a supportive friend or family member, or just someone who loves being part of the energy—we’d love to have you on our team.

All volunteers may choose either:
- A donation to a group
- A free future Trivium Racing or Rock CF race entry (Half Marathon distance or shorter)

And all volunteers get this sweet pom hat!

You can register to volunteer at the link below. Thank you!

05/20/2026

One of the questions we get a lot with a point-to-point race is how the shuttle system works.

Most people park near the finish in Port Austin race morning, then take a shuttle to their start line. You can add the shuttle during registration or later, if you change your mind.

That means when you finish, your car is already there waiting for you.

If you ride the shuttle, and you didn't pick up your bib on Saturday, you can pick up your race packet at shuttle check-in at the finish line. We'll give you a gear check bag that will take your race swag (sweatshirt, etc.) back to the finish line for you. When you finish the race, you'll pick up your gear check bag at the finish line.

Marathon runners start in Caseville. Half Marathon runners start at Sleeper State Park. 5K runners start and finish in Port Austin, so no shuttle needed.

Rock CF Thumb Coast Marathon, Half Marathon & 5K
November 8, 2026

More details at the link in the comments.

05/14/2026

You see a wide range of goals on the road to Port Austin.

Someone trying to break 4 hours. Someone running their first Half. Someone moving up from shorter races to see what the Marathon feels like. Someone trying to qualify for Boston.

And then someone who just wants a well-run race on roads where they can settle in and run.

People chasing something big. And people just looking for a race that feels good to be part of.

Rock CF Thumb Coast Marathon, Half Marathon & 5K
November 8, 2026

More details at the link in the comments.

05/14/2026

Racing in the Rock CF Thumb Coast Marathon, Half, and 5K supports the amazing work of the Rock CF Foundation. Learn more at the link in the comments.

05/08/2026

If you just raced this spring, you might already be thinking about what's coming next. Trying to decide if you're doing another Half. Going for a PR. Going up in distance to the Marathon.

Six months out is a good spot to get a race on your calendar.

Enough time to recover, build back up, and take a real shot at something.

We're six months out from the Rock CF Thumb Coast Marathon, Half, & 5K.

November 8, 2026
Rock CF Thumb Coast Marathon, Half Marathon & 5K
Caseville and Sleeper State Park to Port Austin

More details at the link in the comments.