Just depends on location(s), in your case just CO, and your personal preference, you need to decide what you're comfortable with.
I have friends that will sit in a tent all day when it rains, which to be honest doesn't happen often in CO/UT/WY/MT/ID. Some know there's rain in the forecast and will sit under a tree when it squalls. Again this is personal preference. Other guys know they're in the PNW/BC and understand rain is just part of the day along with pushing through brush.
I'm a pretty aggressive person, hunt in any rain or snow, will bust through anything, and apply all over the west. I like good rain gear and carry the Stormfront system from Sitka because I tend to use it on every hunt and forget about the weather. A lot of folks call this overkill, I just like the insurance knowing I honestly don't have to worry about the terrain or weather on any hunt I do.
If I knew I was hunting in Utah every year, same rough dates, nowhere else, and had my set area, I'd probably be down to some pretty lightweight sub 11oz stuff or maybe nothing because frankly, that's all you need.
A few folks talking about morning dew as well, honestly, First Lite Traverse, Kuiu Scree, or Sitka Ascent gaiters do an awesome job with this and it's what I do. The heavier weight ones I use in snow or if I know there's going to be some really bad deadfall.