I have spent two seasons in Colorado 3rd rifle hunting. Both times, I am set up to truck camp with either mild to medium day hikes, nothing to strenuous, or stationary, glass from camp. The first year, overnight lows were between minus 12 and about plus 10 Fahrenheit. Daytime highs rarely above freezing with snow starting at 24” at 9000 feet. It was cold and you couldn’t wear enough layers to stay warm in the mornings if it was windy at all. Last year was probably a more typical year with overnight lows from around 15 to 20 and daytime highs between 30 and 50. The morning I shot my bull was about 18 degrees with a pretty steady wind at 15 mph, it was cold.
Bottoms:
Kiln
Catalyst foundry - the full length zippers make these great for hiking because you can dump so much heat
Puffy pants for morning glassing - black ovis
Tops:
Wick
Kuiu strong fleece 190
Kuiu super down vest
Rab synthetic mid layer puffy-#similar to Kenai
Catalyst soft shell jacket
Puffy jacket for morning glassing - black Ovis again
Gloves:
150 weight merino
First light Alpine cold weather - I am switching to the black Ovis down mittens for next year, hands were freezing on the glass, bought the mittens in black, the color seems to make them warmer
Medium weight darn tough socks with heated insoles(love truck camping). The heated insoles are clutch when standing in snow all day, feet stay toasty warm.
Really depends on your camping set up, I would have to pair back or swap out some things if I was back pack hunting. E first season I was out, there were times I put rain gear on over top to lock in warmth and lock out wind.
Good luck.