Could someone please help with Bird ID? I believe this is a

It could be a magnificent hummingbird. Upon zooming in on your photo the throat appears to be black, not red. Usually with magnificent hummingbirds their throats have a blue shine to them but at rest it appears black.

black chinned

black chinned looks right

>>2399011
OP's bird looks to be a Black-chinned Hummingbird.

>>2399024
Magnificent Hummingbirds are almost twice that size, with purple iridescent feathers on the crown and black breasts. They don't have white under the throat like in Ruby-throated and Black-chinned Hummingbirds--the whole body is colorful.

It would be even more unusual for a Magnificent to be in Colorado than a Ruby-throated--in the US they're limited to narrow high elevation canyons with small streams and broadleaf trees (like oaks and sycamores) in the mountains southeast Arizona, southern New Mexico, and far west Texas.

It's a black necked greenbuzzer