Welcome to CO deeryd. Sadly, finding trash in the fields and reading the "trash rants" in here is about 20 times more common than taking a shot at a pheasant in CO. But, we spread the word, pick it up and lead by example when we take others to the field with us. Pheasant hunting is getting better here though, with better cover, better land to hunt and a gradual increase in numbers.
Finding good land to hunt is in fact the "hunt" itself when it comes to Colorado Pheasant Hunting. Because if you find good land with good cover and a nearby food source, you've got birds, I'll guarantee that. But they are few and far between and when you do find the pot o gold, mark it on your maps and take care if it like it was your own.
Public land/WIA here is absolutely nothing like ND or SD, so lower your expectations. If you've been out on WIA parcels already, you'd see that maybe 1 out of 10 are huntable with some cover and out of those 1 out of 5 will produce a bird. For example if you're looking at the Phillips County WIA Map, I have two fields marked on that map that I would return to and hunt again next year. Drive by the rest just to see if there is a slight chance they've improved. I've been keeping maps back to 2005. WIA gets hit pretty hard here and farmers are more and more reluctant to "donate" quality land to the WIA program.
Hunting private land in CO takes some serious effort, work, research, small talk and socializing. While some farmers will give you permission to hunt if you go knock on their door, I would say 80% won't and sometimes it's a firm no. While the season goes on and we get deeper into winter, those numbers change as farmers are slowing down and not as busy. One thing I like to do out of season - In mid April, I head out to Yuma and Holyoke for a weekend to scout and visit some of those "annual" WIA spots. I'll spend an hour walking them and picking up trash in parking areas. I've met a lot of farmers this way who have driven up, said thanks and then shoot the breeze with them for a bit and then you've got some private land to hunt next year. Eating and socializing at the local restaurants always produces some birds too.
My advice, although broad because hunters can't be specific, is to head east in CO. Yuma is about as far west as I'll go and rarely am I south of Burlington.
PM me your email address and I'll send some of my maps with annual hot spots.