Arbor Day was the idea of J. Sterling Morton. In 1872, Morton helped start a new holiday in Nebraska dedicated to tree planting. It is estimated that more than one million trees were planted on the first Arbor Day.
Morton's idea quickly spread. Today, Arbor Day is celebrated in all 50 states and in many other countries. Actual dates of the event differ for each area depending on planting times. Idaho celebrates Arbor Day the last Friday of April each year, the same date as National Arbor Day.
Test your knowledge of Idaho's tree. See how many questions you know the answers to in TREE TRIVIA!