Historically there has only been one successful way of carving out your own land to call your own - winning a war.
Yup.
Although, I can envision a scenario where a county deputizes all citizens... militia - well-regulated, of course
... and then sets up checkpoints at all routes into the counties to establish security, detaining for peaceful deportation any state authorities who interfere or breach the checkpoint unauthorized... and then authorizes all citizens within its borders to discontinue paying state taxes.
The key in winning against a greater power without war is to force the greater power into a choice between using its power fully, or backing down. (personally, I think that is EXACTLY where Glenn Beck is coming from, but doesn't feel he has the ability to say openly, but I digress.) Put Colorado into a position where in order to keep these rural counties from seceding, the state would have to mobilize the national guard/state police, and then start killing people for the crime of not paying taxes and wishing to be free of political oppression.
I realize that puts these counties in the position of possibly being the first massacre in the 2nd American Civil War. But it could also result in North Colorado.