National Arbor Day 2023– Every year, National Arbor Day is celebrated on April 28th. however, National Arbor Day falls on the last Friday in April, certain states celebrate their own Arbor Day on other days depending on their own respective planting seasons. State Arbor Day celebrations are:
- Alabama Arbor Day: Last full week of February
- Alaska Arbor Day: Third Monday in May
- Arizona Arbor Day: Last Friday in April
- Arkansas Arbor Day: Third Monday in March
- California Arbor Day: March 7-14
- Colorado Arbor Day: Third Friday in April
- Connecticut Arbor Day: Last Friday in April
- Delaware Arbor Day: Last Friday in April
- Florida Arbor Day: Third Friday in January
- Georgia Arbor Day: Third Friday in February
- Hawaii Arbor Day: First Friday in November
- Idaho Arbor Day: Last Friday in April
- Illinois Arbor Day: Last Friday in April
- Indiana Arbor Day: Last Friday in April
- Iowa Arbor Day: Last Friday in April
- Kansas Arbor Day: Last Friday in April
- Kentucky Arbor Day: First Friday in April
- Louisiana Arbor Day: Third Friday in January
- Maine Arbor Day: Third full week of May
- Maryland Arbor Day: First Wednesday in April
- Massachusetts Arbor Day: Last Friday in April
- Michigan Arbor Day: Last Friday in April
- Minnesota Arbor Day: Last Friday in April
- Mississippi Arbor Day: Second Friday in February
- Missouri Arbor Day: First Friday in April
- Montana Arbor Day: Last Friday in April
- Nebraska Arbor Day: Last Friday in April
- Nevada Arbor Day: Last Friday in April
- New Hampshire Arbor Day: Last Friday in April
- New Jersey Arbor Day: Last Friday in April
- New Mexico Arbor Day: Second Friday in March
- New York Arbor Day: Last Friday in April
- North Carolina Arbor Day: First Friday following March 15
- North Dakota Arbor Day: First Friday in May
- Ohio Arbor Day: Last Friday in April
- Oklahoma Arbor Day: Last full week of March
- Oregon Arbor Day: First full week of April
- Pennsylvania Arbor Day: Last Friday in April
- Rhode Island Arbor Day: Last Friday in April
- South Carolina Arbor Day: First Friday in December
- South Dakota Arbor Day: Last Friday in April
- Texas Arbor Day: First Friday in November
- Tennessee Arbor Day: First Friday in March
- Utah Arbor Day: Last Friday in April
- Vermont Arbor Day: First Friday in May
- Virginia Arbor Day: Last Friday in April
- Washington Arbor Day: Second Wednesday in April
- Washington, D.C., Arbor Day: Last Friday in April
- West Virginia Arbor Day: Second Friday in April
- Wisconsin Arbor Day: Last Friday in April
- Wyoming: Last Monday in April