Started with Weld County. Weld is north of Denver. They are very Pro-2A and to add insult to injury the Dems in the CO legislature passed a law that all energy must meet certain minimums for getting power from so called "renewable" sources. Most of the rural parts of CO cannot afford the costs associated with that unrealistic and unnecessary demand. They've had enough so the county commission is reviewing the legal steps to secede from the state. The process is legal, but very unlikely. Once they approve the ballot measure it will go to the voters for vote. If that passes, it will have to be approved by the state legislature. That's where it will die because the State legislature will not give up the tax income from the rural areas. Essentially the rural areas of Colorado are net tax payers while Denver is a net tax taker. Without the rural areas, Denver doesn't have enough money to feed the sink hole.
If for some amazing reason it passes the State, it would still have to go through the US congress. So it's not likely.
And honestly, if the North goes through with all this, the rest of rural CO will be jumping on the wagon. The only counties that wouldn't would be Boulder and Denver.