- Arbor Day Foundation
 - Tree planting and environmental stewardship nonprofit membership organisation. Programmes include Tree City USA, Conservation Trees, Arbor Day Farm, conferences, and youth education. - Arbor Day Foundation: Enterprise Rent-A-Car 50 Million Tree Pledge
- Explains the collaboration between Enterprise Rent-A-Car and The Arbor Day Foundation to plant 50 million trees over the next 50 years.
- DLTK's: About Arbor Day
- Offers Arbor Day information and activities including colouring pages and poems.
- Nebraska City
- Home of Arbor Day. A bustling tourist centre, widely recognised for its apple orchards, outlet shopping, and historic attractions.
- TreeHelp.com: Arbor Day
- Offers a brief history of Arbor Day as well as a list of state Arbor Day observation dates.
- Wikipedia: Arbor Day
- User-created article on Arbor Day with history, quotes, memorial parks, and related links.
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