Arbor Day 2024 Portland Events. Portland celebrates arbor day in october. Due to our changing climate, portland’s hot dry summers have made it more difficult for trees planted in april to succeed.

Since 1976, the arbor day foundation’s tree city usa program has recognized and supported the cities and leaders who create places to play, room to breathe, and beauty on every block. The city of portland has therefore decided to celebrate arbor day in october, and you’re invited to help plant trees!