The Mammoth 2026 - 100K / 50K / 25K / 10K / 5K and Mighty Mammoth 1K Fun Run

Get pumped for an unforgettable adventure at The Mammoth Race! Kick off the fall season by immersing yourself in the beauty of a thousand-acre eco-haven at the Fall Migration in Hope Ranch. Whether you're in it to set a personal best or just for some fun with the family, we have a distance for you—choose from our variety of races including 100K to 1K distances!

Feel the rush as you traverse scenic routes, spot wildlife, and challenge your limits on well-marked trails. Revel in post-race festivities with music, food, and a vibrant community of fellow runners. Don't miss out on classic swag like finisher shirts, medals, and exclusive buckles for our 100K ultra marathoners! And remember, this event is as green as it gets: B.Y.O.B (Bring Your Own Bottle) to stay hydrated and help keep our trails pristine. Let's make memories that will last a lifetime—lace-up for The Mammoth Race!