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Join us this summer season for the 11th year of the popular Summit Trail Running Series. The Series consists of 6 trail running races in and around the Breckenridge area. Each race features a short and long course, and all races are open to runners of all abilities and ages. Pre-registration fee is $17 for runners 19 and over, day-of registration fee is $22 for runners 19 and over. Runners 18 and under race for free (registration and parent/guardian signed waiver is required). RACE #5 - Mountain Thunder Trail. There are no aid stations on the course; this Series will be cup-free.