Wyo. Stat. Ann. § 22-23-1001

An incorporated city or town having a commission form of government may propose a municipal ordinance by an initiative petition signed by ten percent (10%) of the qualified electors registered in the city or town and filed with the municipal clerk. The petition shall contain the proposed ordinance, the signatures and residence addresses of electors signing the petition, and the date of signing the petition. A petition proposing an ordinance must be submitted to the municipal clerk within ten (10) months of the date of the first signature supporting the petition.