THUNDER BAY THRILLER

Thunder Bay Thriller – Alpena, United States

• Date: August 29, 2026
• Location: Alpena, Michigan
• Distances: 100 miles, 65 miles, 31 miles, 15 miles
• Event Type: Gravel Grinder

The Thunder Bay Thriller offers a multi-surface gravel race in Michigan, with routes winding through the quiet landscapes of the state's northeast. Held in late August, the event provides a beautiful and challenging exploration of the region, from rolling gravel backroads to the forested pathways near Devils Lake. With four distinct distances, it presents a suitable challenge for a wide spectrum of riders, all starting from the Thunder Bay Jr High in Alpena.

Each route has been designed to showcase the varied terrain of the area. The experience combines fast-rolling "hero gravel," sections of more rugged snowmobile two-track, and the winding singletrack of the Norway Ridge Pathway. While the course is well-marked, riders are encouraged to download the provided routes to a GPS device. The mixed surfaces reward thoughtful tyre choice, with organizers suggesting a minimum of 40c for a balance of speed and comfort.

The flagship 100-mile ultra and the classic 65-mile grinder are the day's headline events, attracting a competitive field as part of the Michigan Gravel Race Series. For those seeking a shorter day, the 31-mile and 15-mile options still capture the essence of this gravel race in Michigan. They follow the same scenic paths along Indian Reserve Road and through the Norway Ridge system, providing a full event experience on a condensed loop.

The day begins early, with staggered starts beginning at 7:00 am to give all riders ample time to complete their chosen course. The start and finish area at Thunder Bay Jr High serves as the central hub for the event, though overnight camping is not permitted on-site. However, the Alpena area offers plentiful accommodation, including nearby campgrounds, hotels, and private rentals, making for a comfortable race weekend.

Set in what is known as the Sanctuary of the Great Lakes, Alpena provides a scenic backdrop against Lake Huron. The region's natural character defines the riding atmosphere, offering a sense of escape onto quiet roads and trails. The event is one of many other gravel events in United States that highlight the country's diverse and compelling gravel cycling opportunities.

The Thunder Bay Thriller is more than just a race; it's an opportunity to ride with purpose. All proceeds from the event support the Rock CF Foundation, which works to raise awareness and support for those living with cystic fibrosis. It's a day where the gravel under your tyres contributes to a greater cause, adding a layer of meaning to the physical effort. More details can be found on the official event website.