When Is Arbor Day 2025 Usa. National arbor day is on april 26, 2025. In the united states, national arbor day is celebrated on the last friday in april.

National arbor day is always celebrated on the last friday in april, but many states observe arbor day on different dates based on the best tree planting times for their area. Arbor day for the year 2025 is celebrated/ observed on friday, april 26th.