Don't do it .
They are very likely to be taken by local cats and other predators, or starve , if by some miracle they survive summer and fall , they will definitely die from exposure as soon as the first really cold weather hits.
Not to mention the fact that it's illegal to release animals that are NOT INDIGENOUS into the wild even if there is a poor prospect of them surviving their first winter in the wild.
IMO is a EXCEEDINGLY cruel thing to even consider doing this. I'm horrified that someone would even consider doing what you are proposing to bearded dragons (even if NOT TAME) in a location like Colorado.
There is no way you can justify this cruelty .
This might work in their natural range (in Australia) but NOT anywhere ELSE , OR in the USA. PERIOD.
It's blatantly obvious you know squat about the climate and habitat in their natural range here in Australia.
If you have dragons that you no longer want
rehome them
or give to the local pet shop to sell them ,
or contact the local reptile rescue group or local Herp Club ,
or ask the local vet to euphanise them humanly.
^ I interpret this as a hypothetical discussion about adaptation in different climates rather than an actual plan to release dragons into the wild.