This study focused on the reactions of mountain lions to logging and other human activities in two separate study areas. One area included the Kaibab Plateau in northcentral Arizona, and the other near Escalante in southcentral Utah. Mountain lions were radio-collared and tracked to determine their locations. Locations were classified as (1) in an active timber sale, (2) less than or equal to 1 km of the zone, (3) in an inactive timber sale, (4) less than or equal to 1 km of an inactive timber sale, or (5) not in or near any timber sale. Results from both studies indicate that resident mountain lions are rarely found in or near (1 km) sites logged within the past 6 years. Younger (2 or 3 year old) mountain lions were found in logged areas more often than older lions, but 4 of 5 young mountain lions that visited logged areas did not maintain residence there. Mountain lions in undisturbed areas also tended to be most active around sunset and sunrise. Mountain lions near human presence however, tended to be more active after sunset and during night hours.