Not sure of what is legal in Colorado, but here in Az. coyotes are open year around and can be hunted with any weapon, and no firearm restrictions exist. I use a remote controlled elctronic caller and set it out at about 150 - 200 yds. from my elevated postion. I use a distressd jack rabbit or cotton tail call. It is more fun than you can imagine without having to invest a truck load of money. Back in the old days I used a mouth call (distressed rabbit) and would sit in an elevated place so as to see them on approach using a semi auto 22 LR loaded with HP's. Sometimes they would hold up at 200 - 300 yds., but because I was using a scoped 22 lr (no recoil) rifle I would just walk the rounds in until I found my mark, that's fun no matter who you are!
Now days I enjoy the electronic caller and a high powered rifle with HP's. There ain't nothin more fun than watching a yote litterally explode, in my opinion. A cheap shooting stick is handy if you plan on taking long shots. But a call and rifle are really all that's needed to have gobbs of fun, and gain experience shooting at live animals, sometimes on the run.
A couple tips! Set up in an elevated position, keep the wind in your face in position to the call, and sit against something, rather than hiding in a bush or sky lining yourselves. Yotes are very smart and will often try to circle the caller to identify the meal visually and by scent before coming all the way in.. I've had a few times in which yotes and fox came in behind me, and when I realized it I was within several feet of them. One time my buddy and I had been calling and had just dropped 1, and when we stood up to leave, we turned around to find one standing litterally at our feet looking at us, bewildered I guess. Same thing happened to us with 2 foxes that didn't have any idea what we were. I actually felt kind of bad about those foxes cause they just stood there staring at us.
You can by a remote controlled call for about $30. The last one I bought was about that much and has like 5 different calls on it. Or just pick up a mouth call, Circe make a good one for about $10. we can't use bait out here but if it's legal in Colorado i would pop a rabbit and use that along with the call. Don't handle the rabbit with your hands or your scent may prevent them from coming in close. Scent is about the most important factor in my opinion, which is one reason I like to sit in an elevated position and keep the wind direction as much to my advantage as is possible.
Before I knew anything about calls I would sit in an elevated postion and watch for yotes doing their early morning hunting, but thats more of a time and chance method and can go either way for ya.
GS