National Arbor Day 2025 Theme. National arbor day is always celebrated on the last friday in april, but many states observe arbor day on different dates. National arbor day is always celebrated on the last friday in april, but many states observe arbor day on.
Arbor day is a holiday in which individuals and groups are encouraged to plant and care for trees. America’s first arbor day took place toward the start of the 1870s — right around the time congress established yellowstone national park.