Run the 21666
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Run The 21666 : Stevensville, MD
Run The 21666 takes place on Sunday, December 7, 2025, at Terrapin Nature Park in Stevensville, MD (191 Log Canoe Circle, ZIP 21666). The event is organized by KIRG and is set up as an endurance challenge tied to the number 21666: that number is the park ZIP code and also the time limit for the event in seconds (just over six hours). The listed event has no entry fee for 2025.
Course and format
Participants run repeated laps of a loop around Terrapin Nature Park that is listed as about 2.8 miles per lap. Only full laps count; a tally sheet at the start/finish will record each participant's completed laps. The course description notes roughly 16 feet of elevation gain per lap and includes sections of sand. For this edition the event is restricted to KIRG members, and participants are asked to bring fluids or food to contribute to a shared aid station. Registration for the listed event closes on December 6, 2025. Visit the organization's website for the most recent information.
