Ash treatment schedule

Given the seriousness of the emerald ash borer threat, the Office of the City Forester has developed a plan to treat qualified trees in the public right-of-way over the next few years.

If you have an ash tree in a public right-of-way adjacent to your property, click here to be taken to MyTreeKeeper, then follow the steps below to find out when that tree is scheduled to be treated:

  1. Enter your address in the search bar in the upper left-hand portion of the screen
  2. Click the Picture1“Filters” button in the upper right-hand portion of the map. The “Filters” menu will open to the right of the “Filters” button.
  3. Click the Screen Shot 2016-06-28 at 4.20.12 PM button to illuminate right-of-way ash trees that treated in 2016. (NOTE: Right-of-way ash trees treated in 2016 will be illuminated in yellow. If you click on one of these yellow cones, the information listed alongside “Treatment Schedule” will read “cycle 1.”)
  4. Click the Screen Shot 2016-06-28 at 4.19.14 PM button to illuminate right-of-way ash trees that are candidates to be treated in 2017. (NOTE: Right-of-way ash trees that are candidates for treatment in 2017 will be illuminated in yellow. If you click on one of these yellow cones, the information listed alongside “Treatment Schedule” will read “cycle 2.”)
  5. Click the Screen Shot 2016-06-28 at 4.19.27 PM button to illuminate right-of-way ash trees that are candidates to be treated in 2018. (NOTE: Right-of-way ash trees that are candidates for treatment in 2018 will be illuminated in yellow. If you click on one of these yellow cones, the information listed alongside “Treatment Schedule” will read “cycle 3.”)

If your tree is scheduled for treatment this year, you can expect a qualified crew of tree care professionals to perform a trunk injection treatment free of charge. A postcard containing more information and special instructions will be sent to you prior to the tree being treated. In the meantime, we ask that you water the tree regularly. After your tree is treated, it will be marked with an identification tag.

NOTES:

  • If you’re not sure if you have an ash tree in a public right-of-way adjacent to your property, click here
  • Because of the massive amount of data collected by the Office of the City Forester and included in this map, there may be some delays while MyTreeKeeper loads. Thanks in advance for your patience.
  • MyTreeKeeper is best used on a desktop. It may not function on some mobile devices.

FREQUENTLY ASKED QUESTIONS:

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.

What if I have other ash trees on my property?

Residents are responsible for any ash trees on their personal property. Contact a licensed tree care professional to discuss a plan for your ash tree. Visit BeASmartAsh.org/get-a-tree-professional for a list of licensed contractors.

Why wasn’t my neighbor’s tree selected for treatment?

Due to budget and labor constraints, we are unable to treat every ash tree in the public right-of-way this year. However, we plan to treat more right-of-way trees in the next few years and may include your neighbor’s tree at that time.

How effective are treatments?

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

If my tree is not scheduled for treatment this year, can I do it myself?

Yes, but we strongly suggest you contact a licensed tree care professional to treat your tree. Your tree care professional is required to request a permit from the Office of the City Forester. For a list of licensed tree care professionals, visit BeASmartAsh.org/get-a-tree-professional/.

I already treated the tree. Is the City going to treat again?

No! Please tell us if the tree has been treated so that we don’t double treat. Shoot us an email at forestry@denvergov.org.

Can I refuse treatment?

Yes. If you prefer we not treat your tree, please visit BeASmartAsh/optout immediately. Please note: If the health of the tree declines and the tree becomes unsafe, you will be required to remove it.

What are the risks of refusing treatment?

If the tree becomes infested with EAB and is not treated, it will most likely die within 2-4 years. Once the tree dies, it poses a safety risk and depending on the size and location of the tree, safe removal by a tree professional can be costly.