Huron 100

The Huron 100 Endurance Run returns to Grass Lake in Michigan on June 6th, 2026, inviting endurance runners from across the country to embark on an unforgettable journey through some of Michigan's most stunning landscapes. This year marks the third running of this epic point-to-point adventure along the Huron River Watershed, spanning six state recreation areas and two metroparks, with a challenging mix of trails, bike paths, dirt roads, and paved surfaces that will test even the most seasoned ultramarathon runners.
Grass Lake in June is bathed in early summer light, casting long shadows over winding forest trails and across serene lakes. The air carries hints of pine from nearby woods and the occasional breeze ruffles through leaves just as they are starting to unfurl for the season. This atmosphere sets a perfect stage for the Huron 100 runners who will traverse this diverse terrain, marked by rugged natural beauty that is both demanding and rewarding.
Since its inception in 2024, the Huron 100 has grown into an integral part of the endurance running community's calendar. The event not only challenges participants but also raises funds for local environmental conservation efforts through partnerships with area parks and recreation departments. In addition to the full 100-mile challenge, a more accessible yet equally rewarding option is available in the form of the Waterloo-Pinckney 50 miler, which offers runners an odyssey across the Waterloo-Pinckney region's trails.
The Huron 100 course winds through lush greenery and over rustic bridges, with each aid station providing essential support to help you push forward. The race begins at Portage Lake in Waterloo State Recreation Area early on a sunny morning, allowing participants ample time for preparation before catching the shuttle that will transport them to the start line. As runners make their way across 80% of trail and through various terrains, they encounter aid stations every few miles where volunteers offer hydration, snacks, and words of encouragement.
Weather conditions in June around Grass Lake are typically mild but can vary with occasional showers bringing a refreshing break from warm temperatures. Runners should expect an average temperature range between 15°C to 26°C during the day, with higher humidity levels requiring proper hydration strategies. Trails will likely remain dry and hard underfoot despite possible morning dew or light rainfall.

The Huron 100 Endurance Run offers two challenging distance options: a grueling 100-mile route that covers approximately 160 kilometers of rugged terrain, as well as the more manageable but still formidable 50-mile option. Both routes feature significant elevation changes and long hours on your feet.
To ensure you're ready for race day, registration is now open through early bird pricing until March 2026 via https://ultrasignup.com/register.aspx?did=129465. Early registrants can secure their spots at reduced fees: $375 for the 100-mile run and $225 for the 50-mile option, including a service fee.
Participants should plan to arrive on June 6th with all necessary gear in tow and register between 4 AM and 8 PM prior to race day. Bib pickup will occur at Waterloo State Recreation Area’s Portage Lake boat launch parking lot located at 11500 Seymour Rd, Grass Lake, MI 49240. Be sure to bring photo identification for verification purposes.
All runners must be over the age of 18 by June 6th, and it's recommended that newcomers familiarize themselves with the course layout ahead of time either through official maps or personal scouting runs in preparation zones like Waterloo State Recreation Area itself.
The Huron 100 Endurance Run on Grass Lake, Michigan, is more than just a race; it’s an opportunity to connect deeply with nature and challenge oneself within a supportive community setting. Whether you’re tackling the full 100 miles or venturing into new territory for the WP 50 miler, this event promises an unforgettable experience come June 6th, 2026.