It marked the fourth year in a row that the course record fell, all since Woodstock organizers added a $500 incentive for breaking a record Scott Strand held for years.
Cheptoek, who beat Emmanuel Bor by one second a year ago, won by 22 seconds Saturday.
Lydia Kosgei was the top female in 17:06, a full minute slower than Risper Gesabwa’s 2012 record. The women’s record had fallen three years in a row.
This year’s Woodstock was the 33rd and the final time the race is scheduled to hold the designation as the Road Runners Club of America’s 5K championship. Woodstock held that designation four of the past five years, including the past three.
A total 1,378 runners registered for Saturday's Woodstock 5K and Kidstock mile fun run, and 1,241 participated. The 2012 field of 1,554 set the record.
Sports Columnist Joe Medley: 256-235-3576. On Twitter @jmedley_star.