C.R.S. § 1-13.5-305

A write-in vote for any local government office is counted only if an affidavit of intent to be a write-in candidate is filed with the designated election official by the person whose name is written in not later than sixty-four days before the day of the election. The affidavit of intent must indicate that the signer desires the office and is qualified to assume the duties of that office if elected.