you can shoot'em up on private property if they are causing damage, we took out 40+ today at the ranch, below is a copy and paste from the colorado laws page, it is allowed per crs# 33-6-107(9)Originally Posted by foxtrot
(9) For the purposes of this section, any person, or members ANY MEMBER of his SUCH PERSON'S family, or his agents ANY EMPLOYEE OF THE PERSON may HUNT, TRAP, OR take black-billed magpies, common crows, starlings, English or house sparrows, common pigeons, coyotes, bobcats, red foxes, raccoons, jackrabbits, badgers, marmots, prairie dogs, pocket gophers, Richardson's ground squirrels, rock squirrels, thirteen-lined ground squirrels, porcupines, crayfish, tiger salamanders, muskrats, beavers, EXOTIC WILDLIFE, and common snapping turtles on lands owned or leased by him THE PERSON without securing licenses to do so, BUT ONLY when such wildlife is causing damage TO CROPS, REAL OR PERSONAL PROPERTY, OR LIVESTOCK. Any person may take KILL skunks or rattlesnakes when necessary to protect life or property. THE PELTS OR HIDES OF any such wildlife MAMMALS taken under this subsection (9) may be TRANSFERRED, POSSESSED, TRADED, BARTERED, OR sold by purchasing ANY PERSON WHO HOLDS an appropriate small game or furbearer license
here is a link to the dow season page there is no season on private land they are fair game jan.1 to dec. 31
http://wildlife.state.co.us/Hunting/...tesandFees.htm