• Annie's Arbor Day - Provides information about the holiday's history and includes Bible verses about trees.
• Arbor Day - The history of the observance with information about international "tree" celebrations. Find out when each U.S. state celebrates Arbor Day.
• Arbor Day - Features timetable of the holiday's development. From Ohio Division of Forestry.
• Arbor Day - Day of Trees - Tells about Arbor Day in Australia.
• The Arbor Day Foundation - Provides resources for the nationally-celebrated observance that encourages tree planting and tree care.
• Arbor Day Information - Features trivia quiz, scavenger hunt suggestions, historical information, and tips for tree planters.
• Celebrating Arbor Day at The Holiday Zone - Offers brief history, art and craft activities, songs, action rhymes, word puzzles, coloring pages, printable worksheets, word wall, and poems.
• J. Sterling Morton Creates Arbor Day - Online exhibit from Nebraska State Historical Society includes an excerpt from Morton's diary written two days before the first observance.
• Teachers' Guide to Arbor Month - Printable PDF guides for kindergarten through middle school teachers from the Minnesota Department of Natural Resources.
• Today in History: April 10 - The Library of Congress presents a brief history of the first Arbor Day.

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