Friday, July 22, 2016

Ash Trees

As you may know, Denver Parks & Recreation’s Office of the City Forester recently launched the Be A Smart Ash campaign ( to educate and inspire Denver residents to take action against the Emerald Ash Borer (EAB), an insect not native to Colorado that has the potential to destroy Metro Denver’s 1.45 million ash trees – or 1 in 6 trees in the City and County of Denver.

As part of the effort to combat EAB, the Office of the City Forester has developed a systematic plan to treat qualified trees in the public right-of-way over the next few years – including trees in your neighborhood. Residents whose right-of-way ash trees have been selected by the Office of the City Forester for free treatment by a crew of licensed tree professionals this year will be notified by mail beginning early next week. You’ll soon see these crews at work and treated trees will be marked with identification tags.

We hope you’ll agree that trees are critically important for our overall quality of life. Among other things, they produce oxygen, reduce smog, cool our neighborhoods and homes and increase our property values.

How You Can Help

To join our effort to save Denver’s ash trees, we hope you will reach out to your neighborhood residents and encourage them to:

  1. Learn more about EAB
  2. Identify their own and their neighbors’ ash trees
  3. Make a plan of action

Additionally, in case it’s helpful to you, we’ve drafted suggested copy for you to share via newsletters, social media, or in whatever way works best for you to help inspire and engage your residents, as well as the campaign logo.  We’ve also provided some answers to FAQs that we anticipate specifically related to the free treatment of ash trees to help prepare you for conversations with your audience. Of course, we welcome you to reach out for support at, or 720-913-0651.


Robert Davis

City Forester


How did you choose which ash trees to treat?

Healthy ash trees that are 12 inches and larger in diameter at 4.5 feet off the ground were put on a list for potential treatment. From this list, a number of trees were randomly selected in each neighborhood to be treated in either 2016, 2017 or 2018. Every ash tree scheduled to be treated in 2016 was examined by a city arboreal inspector to determine if it was a good candidate for treatment. 


There is more than one ash tree on the public right-of-way. Are they all being treated?

To see which right-of-way ash trees are being treated and those that are candidates for future treatment, visit

 How effective are treatments?

When properly administered by a tree professional, treatment is over 90% effective.