MammothMarch Upstate New York

The MammothMarch Upstate New York returns to Letchworth State Park on August 8, 2026, offering a challenging and rewarding 20-mile hike through one of the most scenic areas in the Eastern United States. This event is more than just a race; it's an immersive experience set within the grandeur of what has been repeatedly voted as “Best Park in the United States.” Letchworth State Park, known colloquially as the "Grand Canyon of the East," provides runners with breathtaking views and lush forest trails that wind through towering gorges and alongside the Genesee River. The park's natural beauty is a testament to why this event has become so beloved by hikers from across the country.
On race day, the air will be crisp and invigorating as you traverse the single-circuit loop, which leads along the river, offering spectacular waterfall and gorge views at every turn. The landscape feels alive with the energy of an enthusiastic community that gathers to support this annual event. The terrain is a mix of forest paths and rocky trails, creating both scenic beauty and physical challenges for participants.
As you step off the starting line in Castile, New York, you'll be greeted by the warm August sunshine, which will feel comfortable at 19.5°C on average, with humidity levels around 76.8%, making it an ideal day to explore Letchworth's rugged beauty. The course features a steady incline and decline as it follows the river, offering several aid stations along the way for hydration and nutrition. Runners can expect some wind speeds of up to 10.5 km/h, which might make the run feel slightly cooler than the average temperature.