When Is Arbor Day 2026. This wonderful holiday of communion with nature, national arbor day, is observed on the last friday in april. Chose a month to view an observance and holiday calendar for that month in 2026.

National arbor day is always celebrated on the last friday in april, but many states observe arbor day on different. Arbor day is a public state holiday in nebraska that is celebrated on the final friday of every april.