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Forestry Division, Public Works & Natural Resources

Forestry maintains and cares for trees on public property, including parks, arterials, greenways, ditches, retention sites and around public buildings. Maintenance includes planting new trees, trimming existing trees, spraying trees, testing trees for disease and removing dead and/or diseased trees. This service also responds to citizen questions and concerns, and conducts public education programs.

Frequently Asked Questions

Hot Topics

adult-emerald-ash-borerEmerald Ash Borer

Emerald Ash Borer (EAB) is a non-native, wood-boring bettle that can attach all ash (Fraxinus) tree species. This insect was first discovered in Michigan in 2002, and since then it has spread to 22 states, with Colorado being the most recent. The ash tree is very commonly planted tree in many communities. EAB has killed tens of millions of ash trees in the United States. Once the EAB population builds in numbers, ash mortality is near 100%.

The City of Boulder first discovered and confirmed the presence of Emerald Ash Borer in September, 2013. Boulder Urban Forestry is presently conducting a delimitation survey to determine the extent to which EAB has spread within the City of Boulder. Results from this survey should be available soon.

On November 12, 2013 the Colorado Department of Agriculture established a quarantine zone around Boulder County, the City of Erie, and the Republic Landfill (north Jefferson County) off of Highway 93.

Longmont area ash tree population is estimated at approximately 43,000 trees. The City of Longmont has conducted an initial ash inspection survey and as of December 2013, EAB has not been found in Longmont.

Colorado Department of Agriculture and Colorado State Cooperative Extension recommend that preventative treatments should begin when Emerald Ash Borer presence has been confirmed within a five (5) mile radius. Therefore, EAB treatment for ash trees in Longmont is not recommended at this time.

More information on symptoms, treatment and reporting is available at:


broken-tree-due-to-snowWhat to do about trees damaged by snowstorms

Tree care and maintenance is the responsibility of the owner of the tree. A tree located on private property is the responsibility of that property owner. Trees located on public property such as Parks, around municipal buildings and in the street right-of-ways are the responsibility of the City of Longmont.

If you are in need of assistance addressing tree concerns on your property, please use an arborist provided on this list Licensed Tree Contractors. These tree contractors are licensed and have the necessary insurance to perform work in the city of Longmont. The City does not endorse any of the contractors on this list, but provides this contact information as a service to residents.

Please understand that an Arborist is a specialist in the care of individual trees. Arborists are knowledgeable about the needs of trees and are trained and equipped to provide proper tree care. Pruning or removing trees, especially large trees, can be dangerous work. Tree work should only be done by those trained and equipped to work safely in trees.

For questions or additional information, please call Forestry Services at 303-651-8446.


winter tree watering guidelinesWinter Tree Watering Guidelines

Long, warm, dry weather conditions in the winter can injure or cause death to plant root systems!

General Information

Forestry and the Environment

(from the 2008 Tree Canopy study)

Longmont’s current urban forest was found to store 62,873 tons of carbon, sequester 489.5 tons per year, and when including stormwater & water quality benefits, constitutes a combined value of over $8,400,000.00 in savings to the city."

"The City of Longmont has a current tree canopy of 1461 acres or about 8.7% of the citywide area of 16,704 acres. The impervious surfaces total close to 40% of the city (7766 acres), which includes impervious surfaces that are drained to a sewer and compacted dirt or gravel surfaces.

The current tree canopy cover CITYgreen report for Longmont reflects a value of $246,825 in air quality pollutant removal savings and a total carbon storage capacity of around 62,873 tons.

With an increase in total tree canopy to 25% coverage or an additional 2715 acres, the storage capacity increases to 179,696 tons with an additional 1399 tons sequestered annually based on tree growth. Moreover, the city realizes a significant cost savings due to the improved canopy ($705,441), an increase of $458,616. The payback includes tens of thousands of pounds of widespread air pollutant removal, greater than before health benefits, lesser costs associated with poor health, and an aesthetically more pleasing cityscape, just to name a few. Trees impact stormwater runoff in a number of ways. With an increased tree canopy from 9% to 25%, the city could potentially realize over $20M (twenty million dollars) in runoff savings and would require almost 10 million cubic feet less in water retention facilities capability.

2008 Tree Canopy Study - (2.3 MB)

Forestry Staff

Ken Wicklund Forestry Supervisor 303-651-8449

Ernie Wintergerst

Andy Koepel

Forestry Technician

Forestry Technician

303-774-4385, ext. 1

303-774-4385, ext. 2