Emerald ash borer now detected in more than 20 Front Range cities
October 21, 2025
First detected in Boulder in 2013, this invasive, tree-killing beetle threatens thousands of Colorado’s ash trees.
EAB Resources
Publications
- EAB Quick Guide (6 MB PDF)
- Insecticide Options for Protecting Ash Trees from Emerald Ash Borer (7.5 MB PDF)
- Diagnosing Emerald Ash Borer and Other Ash Tree Damage: A Diagnostic Field Guide (5.6 MB PDF)
- Insecticides Used to Control Emerald Ash Borer on Residential Shade Trees
Partner Websites
- Don’t Move Firewood
- Find an Arborist to Inspect your Ash Tree
- Emerald Ash Borer Information Network from Michigan State University & USDA Forest Service
CSFS Links
CSFS News About EAB
Emerald Ash Borer Confirmed on Colorado’s Western Slope for First Time
July 6, 2023
In June 2023, experts from Colorado State University confirmed the presence of emerald ash borer (EAB) in two new towns in Colorado: Carbondale and Littleton.
Emerald Ash Borer Confirmed in Thornton, CO
June 28, 2022
Experts from Colorado State University Extension confirmed the presence of emerald ash borer (EAB) in the City of Thornton in June 2022. This is the first confirmation of EAB in a Colorado city east of I-25.