City of Thornton's 13th Annual Cottonwood Classic 5K for runners, race walkers and fitness walkers.  The race course will start and finish on Washington Center Parkway, on the east side of the Thorncreek Shopping Center.

Registration begins April 23 at the Margaret W. Carpenter Recreation Center.  
Mail-in registrations must be received by May 12; 
walk-in registration deadline is Thursday, May 15.  
Registration will also be available the day of the race, beginning at 7 a.m. (fee increases by $5.)

Preregistration Fees:
$23/ 13 & over, $16/ 12  & under & 60+ 

Day-of-the-Event Fees:
$28/13 & over, $21/12 & under & 60+