Arbor day is celebrated the 2nd Wednesday of April in Washington State. To see when Your state celebrates, click HERE. Traditionally, most of the states celebrate the last Wednesday of April. Anyway, this year I am not planting a tree. I usually try to plant a tree, an apple or such (last year it was a Peach), But I am tree'd out. But fear not. I planted two Red Currant Bushes this year, instead of a tree. Also to celebrate, one could make a purchase of trees to be planted in national forests and such, through the arbor day foundation, or check with your local city, county or state to see where volunteer oppurtunities exist. Or just plant one in your own yard.