April 28th, 2025
| Company: | National Arbor Day Foundation |
| Web site: | http://www.arborday.org |
National Arbor Day was proclaimed as the last Friday in April by President Richard Nixon in 1970. A number of state Arbor Days are observed at other times to coincide with the best tree-planting weather, from January and February in the south to May in the far north. The observance began in 1872, when Nebraska settlers and homesteaders were urged to plant trees on the largely treeless plains. National Arbor day frequently is associated with many environmental groups' efforts and is on par with Earth Day in its importance.
