For those that are Google challenged:
12-27-102. Legislative declaration - residents
(1) It is declared by the general assembly that it is lawful for a resident of this state, otherwise qualified, to purchase or receive delivery of a rifle or shotgun in a state contiguous to this state, subject to the following restrictions and requirements:

(a) The sale must fully comply with the legal conditions of sale in both such contiguous states;

(b) The purchaser and the licensee must have complied, prior to the sale or delivery for sale of the rifle or shotgun, with all of the requirements of section 922 (c) of the federal "Gun Control Act of 1968", applicable to interstate transactions other than at the licensee's business premises.

Notice is says a resident may purchase a long gun in states contiguous to CO. It doesn't say a CO resident CAN'T purchase in a state that's NOT contiguous to CO.

Just an FYI....WY is contiguous to CO.