Arbor Day 2025 Theme. Download the 2024 arbor day flyer for more information. National arbor day is always celebrated on the last friday in april, but many states observe arbor day on different dates throughout the year based on best tree planting times in.

National arbor day is always celebrated on the last friday in april, but many states observe arbor day on different dates throughout the year based on best tree planting times in. It is a day designed to promote the planting and.