Bow hunting season for deer and elk started in Colorado on Saturday and goes until the 23rd of September, when the rifle seasons start. Bag limits vary from unit to unit, but there’s usually no limit on cow elk and deer. You need a tag for all animals taken, and if you’re from out of state that can get expensive. It’s $400 per deer, almost $700 for elk, $2,200 for moose, etc. Residents play far less for tags, $31 for deer, $46 for elk, $251 for moose, etc.