Wyo. Stat. § 27-6-110: Children; hours of labor.

(a) No child under sixteen (16) years of age shall be employed, permitted or suffered to work at any gainful occupation except farm or domestic service, for more than eight (8) hours in any twelve (12) hour period, or before the hour of five (5:00) o'clock a.m. or after the hour of ten (10:00) o'clock p.m. on nights followed by a school day, or after the hour of twelve (12:00) midnight on days which are not followed by a school day.

(b) Provided however that children between the ages of fourteen (14) and sixteen (16) years who are not enrolled in school may be employed at any gainful occupation for an eight (8) hour period between the hours of five (5:00) a.m. and twelve (12:00) midnight of any one (1) day.