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Emerald Ash Borer Alert

On June 18, 2020, Emerald Ash Borer was confirmed to be in Arvada.

Emerald Ash Borer ( EAB ) is an invasive insect that has killed more than 50 million Ash trees in 30 states since the initial discovery in Michigan in 2002. This insect is considered to be one of the most destructive, invasive species the United States has faced.

The City has been preparing for the eventual infestation of EAB well ahead of its official arrival. During the last several years, forestry staff have completed an inventory of the size, location and health of all 1,500 ash trees on City of Arvada public property, and the City has identified resources to proactively respond to the potential EAB infestation of ash trees in City parks and on other public land. Learn about the City's EAB Management plan.

Questions and Resources


  • What does the Emerald Ash Borer Look like?
    The insect is metallic and green. It is 1/2'"long and 1/8" wide. Learn more.

  • Where has the beetle been found?
    The beetle was first identified in Michigan in 2002. Since then it has spread to Canada and 30 states. In September 2013 it was found in the city of Boulder, Longmont and most recently was found in Broomfield and Westminster.

  • Has the beetle been found in Arvada?
    Yes. In June 2020 the beetle was confirmed to be in Arvada.

  • Is there anything I can do to protect my ash trees?
    It depends on the health of the trees. Healthy ash trees can be treated chemically by a tree care specialist for protection against the EAB. Trees in poor health should be removed and replaced. For additional information about treatment options, visit

  • What trees are at risk?
    All species of Ash trees 

General Information

For more information on EAB please visit‚Äč


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