Emerald Ash Borer (EAB) Confirmed in City and County of Denver - What to Know & Next Steps

Written By Michael Atkins

The emerald ash borer (EAB), an invasive pest that has devastated ash tree populations across the U.S. and Canada, has been confirmed in the City and County of Denver as of June 19, 2025. This insect poses a significant threat to our urban canopy, as 1 in every 6 trees in Denver is an ash tree. 

But there is good news! There are steps you can take to protect your ash trees and help slow the spread.

Identify Ash Trees

Look for compound leaves with 5-9 leaflets, opposite branching, and diamond-patterned bark. You can visit BeASmartAsh.org for more resources

Inspect your Trees

Signs of EAB include:

  • D-shaped exit holes in bark

  • S-shaped tunnels under peeling park

  • Thinning branches and a dying canopy

  • Increased woodpecker activity

Take Action

Have a licensed tree case professional inspect your trees, and discuss a treatment or prevention plan.

Help protect Hilltop’s beautiful canopy and get your trees checked today!

Michael Atkins
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