The Chatfield Classic will consist of a 1-mile swim and a 2-mile swim. Swimmers will be asked to line up at their pre-assigned and numbered flag prior to the race. Swimmers will start at 5-second intervals for both races sequentialy. The 1-mile swimmers will start first, followed by the 2 mile swimmers.

Participants who have not swam at the Chatfield gravel pond in the past should be aware that there is a gravel bar in the middle of the lake. The gravel bar can create some shallow and slightly technical swimming, and also adds some race character.

Participants may sign up for either the 1-mile swim, or the 2-mile swim. The start will be sequential "time-trial" format with swimmers leaving at 5-second intervals.

All Mountain Swim Series events will be sanctioned and insured by the World Open Water Swimming Association (WOWSA). All events will be supported by safety watercraft, lifeguards, and paramedics/EMTs.