CWD testing for deer (bucks and does) is mandatory and free for all rifle season hunters who have harvested in specific hunt codes in the following GMUs: 1, 2, 3, 4, 5, 6, 10, 14, 16, 17, 21, 30, 31, 32, 40, 41, 42, 43, 44, 47, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 161, 171, 201, 214, 301, 421, 441, 444, 471, and 951.
The hunt codes selected for mandatory testing are shaded green in the 2023 Colorado Big Game Brochure, starting on page 22.