My son has a youth cow tag for GMU 3 and we are headed there next week. He is 15 and this is out first Colorado trip any tips?Colorado’s units 3-301 have a December 1-31 cow elk hunt. If we have a snowy winter you should be able to tag a cow in unit 3, a major herd winters there. There is a lot of public BLM land in that unit. It is cold as heck that time of year.