I'm in Northern Utah. It's considered high desert, super dry, with elevation
about 4300'. Not as bad as CO but it definitely factors into hatching.
I'm in the Albuquerque area at 5000'
Probably best to buy eggs at or above in elevation, but haven't found any breeders of what I want in CO (which would be higher than here.) So I've bought at about 2500' lower in elevation and so far so good. When I was living at 2500' I found it very easy to hatch sea-level laid eggs, so hoping the math translates the same.
The other alternative to get what I'd like would be chicks...but where's the hatch fun in that?