#Social Celebrate Arbor Day! Arbor Day was started in the state of Nebraska in 1854 by Julius Sterling Morton. Nationally Arbor Day is celebrated on the last Friday in April. Share this:Tweet Joy Henry Joy Henry is a journalist in the Capital News Service Social Journalism bureau. She has worked as a Floor Director for “Wake Up Washington” on WUSA*9, and as an intern in the web department at WJLA.com.