On April 10, 1899, Montana officially established Arbor Day, a day dedicated to planting trees and promoting environmental stewardship. Governor Robert Smith, at the request of the Montana Legislature, signed the act into law, recognizing the importance of forestry and conservation for the state's future.

This initiative reflected a growing national awareness of environmental issues and the need to protect natural resources. For Montana, a state rich in timber and natural beauty, the establishment of Arbor Day was a significant step towards fostering a culture of conservation.

The annual observance encouraged citizens, schools, and communities to participate in tree-planting activities, contributing to the reforestation and beautification of the state. This event underscores Montana's early commitment to environmental preservation and its recognition of the long-term benefits of sustainable practices.