In the years following that first Arbor Day, Morton's idea spread beyond Nebraska with Kansas, Tennessee, Minnesota and Ohio all proclaiming their own Arbor days. Today, all 50 states celebrate Arbor Day although the dates may vary in keeping with the local climate. At the federal level, in 1970, President Richard Nixon proclaimed the last Friday in April as National Arbor Day.
Arbor Day is also now celebrated in other countries including Australia. Variations are celebrated as 'Greening Week' in Japan, 'The New Year's Days of Trees' in Israel, 'The Tree-loving Week' in Korea, 'The Reforestation Week' in Yugoslavia, 'The Students' Afforestation Day' in Iceland and 'The National Festival of Tree Planting' in India. Julius Sterling Morton would be proud. Sometimes one good idea can make a real difference.