Arbor Day celebrates the quiet power of trees—the way they steady ecosystems, shelter wildlife, cool cities, and shape the environments we rely on every day. Observed in the United States on the last Friday in April, the day encourages communities here—and in many other countries, where dates vary according to growing season—to plant, protect, and care for forests of every kind, from neighborhood canopies to iconic wildlands.
Arbor Day
Today in History
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Wind Cave National Park celebrates 120 years
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Aspens in the White River National Forest, Colorado
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Hello, spring!
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There once was a lighthouse from...
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Spring comes to the Diablo foothills
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Eben Ice Caves, Upper Peninsula, Michigan
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Sea Slug Day
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There’s a dog in there somewhere
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World Frog Day
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Endangered Species Day
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Sea Otter Awareness Week
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Alaska moose
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Saint Andrews Day
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International Jazz Day
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Fight for your lefts
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Füzér Castle in the Zemplén Mountains, Hungary
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Go Fly a Kite Day
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Blue linckia sea stars in Papua New Guinea
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First Cliff Walk
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Palmyra Atoll National Wildlife Refuge
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Birds of a feather flocking together
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National Cherry Blossom Festival, Washington, DC
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World Olive Tree Day
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Summer solstice
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Christmas star lanterns, Germany
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Ready. Set. Snow.
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Leopard at Etosha National Park, Namibia
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Wild turkeys in repose
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The natural ice wall of Misotsuchi, Chichibu, Japan
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Taughannock Falls State Park
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