I think they are too warm for Colorado or maybe for any backpack hunt - but I think north-south makes a bit of difference (south seems a little sunnier to me but that is probably just in my head). I was near gunnison, Temps were high of 40 low of 20 and snow on the ground every day. 6 days, 6 miles in. I wore Sitka timberline and only needed to wear my 130 wt merino long johns one morning sit, I also had the Kuiu superdown pants and I would recommend those for the extra chilly days. I would have preferred my lighter Kuiu attack pants with hip vents for hiking, but I really like the waterproof knees and seat on the timberlines. For an only pair situation, the hiking would be beyond brutal imo in the chinooks (I have a chinook jacket, tried the pants on but returned them for the reasons above - they don’t really fit well into any scenario for me - I much prefer to layer my pants rather than feel the sweat roll down my legs.
Good luck out there! I’ll be out second season this year!