Arbor Day In 2024. Join us on april 26th from 11 am to 1 pm for a day of greenery and growth as we celebrate arbor day! Arbor day is an annual celebration of tree growing and a national holiday in the us.
In brazil, arbor day (dia da arvore) is celebrated on september 21. Due to our changing climate, portland’s hot dry summers have made it more difficult for trees planted in.