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Arbor Day


April 26, 2019
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Trees provide the very necessities of life itself. They clean our air, protect our drinking water, create healthy communities, and feed the human soul. But these life necessities are threatened around the globe.

Our own Olmsted Woods is the last vestige of an extensive Oak and Beech forest on Mount St. Alban – now the site of Washington National Cathedral and the three Cathedral Schools. All Hallows Guild restored the five-acre Olmsted Woods over a 10-year period, completed in 2008 at a cost of nearly three million dollars. Our Olmsted Woods volunteers meet regularly on Wednesday mornings to maintain the health of the woods and remove invasive plants. You are welcome to join them by filling our our Volunteer Form.

The first Arbor Day celebrated in the United States was April 10, 1872 in Nebraska City, Nebraska. By the 1920s, each state in had passed public laws that stipulated a certain day to be Arbor Day or Arbor and Bird Day observance. National Arbor Day is celebrated every year on the last Friday in April.

The customary observance is to plant a tree. On the first Arbor Day, April 10, 1872, an estimated one million trees were planted.

Visit the Arbor Day Foundation website to learn more.



All Hallows Guild was founded in 1916 to provide for the care and beautification of the grounds of Washington National Cathedral. The Guild works closely with the horticultural staff to preserve this historic landscape and raises funds for renovation and renewal of the gardens.


  • (202) 537-2937
  • ahg@allhallowsguild.org
  • 3101 Wisconsin Ave NW
    Washington, DC 20016


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