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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Coming home to roost
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International Day for Biosphere Reserves
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Nazaré Lighthouse
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What are these creatures?
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Rays on parade
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Brown-throated three-toed sloth in cecropia tree, Costa Rica
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Books for children of all ages
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Here, fishy!
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National Park Service anniversary
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A wonder in winter
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From the mind of Frank Gehry
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An inland ocean
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The party’s just starting
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Autumnal equinox
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It’s surströmming time
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Dashing through the snow
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Penguin Awareness Day
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Congratulations, 2019 Nobel Prize laureates!
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Bearded reedlings in Flevoland
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World Lion Day
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Playa del Silencio, Spain
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Gateway Arch in St. Louis, Missouri
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Point Reyes National Seashore
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International Day of Human Space Flight
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The otherworldly red river
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Indigenous Peoples Day
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World Children s Day
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Going head-to-head with winter
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Northern cardinal in winterberry bush
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Juniper Springs, Florida
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