Wyo. Stat. § 1-21-1303

(a) In any action brought by a landlord against a tenant to recover rent for breach of lease, the tenant shall have an affirmative defense and not be liable for rent for the period after which a tenant vacates the premises owned by the landlord and covered by the lease, if by a preponderance of the evidence, the court finds that:

(i) At the time the tenant vacated the premises, the tenant or a member of the tenant's household was under a credible imminent threat of domestic abuse or sexual violence at the premises, as demonstrated by medical, court or police evidence of domestic abuse or sexual violence; and

(ii) The tenant gave seven (7) days written notice to the landlord prior to vacating the premises stating that the reason for vacating the premises was because of a credible imminent threat of domestic abuse or sexual violence against the tenant or a member of the tenant's household.

(b) In any action brought by a landlord against a tenant to recover rent for breach of lease, the tenant shall have an affirmative defense and not be liable for rent for the period after which a tenant vacates the premises owned by the landlord and covered by the lease, if by a preponderance of the evidence, the court finds that:

(i) The tenant or a member of the tenant's household was a victim of domestic abuse or sexual violence on the premises that are owned or controlled by the landlord and the tenant has vacated the premises as a result of the sexual violence;

(ii) The tenant gave seven (7) days written notice to the landlord prior to vacating the premises stating that the reason for vacating the premises was because of the domestic abuse or sexual violence against the tenant or a member of the tenant's household, the date of the sexual violence, and that the tenant provided medical, court or police evidence of domestic abuse or sexual violence to the landlord supporting the claim of domestic abuse or sexual violence; and

(iii) The domestic abuse or sexual violence occurred not more than sixty (60) days prior to the date of giving the written notice to the landlord, or if circumstances are such that the tenant could not reasonably give notice within that time period because of reasons related to the domestic abuse or sexual violence, including, but not limited to, hospitalization or seeking assistance for shelter or counseling, then as soon thereafter as practicable.

(c) A landlord may not terminate a tenancy based solely on the tenant's or applicant's or a household member's status as a victim of domestic abuse or sexual violence. This subsection does not prohibit adverse housing decisions based upon other lawful factors within the landlord's knowledge.

(d) Nothing in this act shall be construed to be a defense against:

(i) An action for recovery of rent for the period of time before the tenant vacated the landlord's premises and gave notice to the landlord as required in this section; or

(ii) Forcible entry and detainer for failure to pay rent before the tenant gave notice to the landlord as required in this section and vacated the premises.