Trees

• Regulated tree: Any tree on public or private property that is 8 inches or larger in diameter at four feet high is considered a regulated tree. All street trees, buffer trees, parking lot trees and significant trees are regulated.
• Street tree: A tree located in the public right-of-way between the curb, or edge of roadway, and the property line. Trees located within a public right-of-way where no roadway exists are not considered street trees.
• Significant trees: Trees adopted by the City, with the approval of the property owner, as trees of significance related to a historic event, uniqueness of shape or species, location, age, or functionality.
• Buffer tree: A buffer tree helps provide screening between different land uses such as businesses and single-family homes. The City requires buffers in certain circumstances.
• Tree topping: The severe cutting back of limbs or main stem to stubs larger than three inches in diameter within the tree’s crown to such a degree as to remove the normal top and disfigure the tree. This is a violation and is considered similarly to tree removal. 

Uncontrolled cutting or destruction of trees within the city decreases the community's livability. It is in the public interest to preserve significant trees, to control the cutting of trees, and to protect trees from damage. Trees in Gresham are regulated differently depending on their location, purpose, size, and significance.

Before removing any tree on your property, and to determine whether you need a removal permit, we recommend contacting the Planner on Duty at 503-618-2780 or POD@GreshamOregon.gov. You can call anytime you have a question about trees in your yard.

When is a permit not required?

Any tree less than six inches in diameter measured at 4.5 feet in height may be removed without a permit. Outside sensitive areas trees 6-8 inches in diameter may also be removed without a permit. Relocation of a healthy tree is encouraged.

Trees in sensitive areas

In the floodplain, hillside and geologic risk and natural resource overlays, trees more than six inches in diameter perform special functions, so they have special protections. Contact the Planner on Duty at POD@GreshamOregon.gov for specific regulations. Most need to be retained if they are healthy and replaced if they need to be removed. You can check whether any of these areas are present on your property by typing your address into Gresham Map.

Regulated trees

Trees over eight inches in diameter measured at 4.5 feet are regulated trees. Except on properties in the Hillside, Habitat Conservation Area, or Flood Plain areas or as otherwise specified in the City's tree regulations:

• Up to three regulated trees on an undeveloped or low density residential property 35,000 square feet or less may be removed within a 12-month period.
• Six regulated trees on an undeveloped or low density residential a property over 35,000 square feet may be removed within a 12-month period.

You must obtain a tree removal exemption prior to removal of any regulated trees on your property. 

When is a permit required?

Tree locations and permits required

• Trees located around the perimeter of a site that were required through a development permit as buffer trees: Type I tree removal.
• Regulated trees located in the flood plain, hillside constraint district, or habitat conservation area:  Type II tree removal permit and development permit. An exception is granted for up to three regulated ornamental trees, which require a Type I tree removal permit.
• Trees located within a commercial, industrial, or multi-family landscaping area or a parking lot: Type I tree removal; additionally, these trees must be replaced at a ratio of one-to-one
• Removal of more than three or six regulated trees (as described above under regulated trees):  Type II tree removal permit
• Removal of a significant tree: Type III hearings official decision based on criteria in Section 9.1000 of the  Development Code.
• Removal of a street tree: Type I tree removal

If you have any questions about tree removal contact the Planner on Duty at 503-618-2780 or POD@GreshamOregon.gov for additional information.

Fees and timelines

• Permit: Type I tree removal permit: no fee
  Timeline: Up to one week
• Permit: Type II tree removal permit: see the City fee schedule        
  Timeline: Up to three three months
• Permit: Type III hearings procedure: no fee 
  Timeline: Up to four months

How to keep your trees healthy

Tree trimming guidelines

General tree health

Tree pruning basics

• No permit is required to prune a tree on private property, unless it is a designated significant tree.
• Property owners are responsible for maintenance of street trees located in the public right-of-way next to their properties.
  • Street trees must pruned in accordance with the City's tree-trimming standards.
  • All overhanging branches must be at least eight feet above the sidewalk and 12 feet above the street.
• If more than 20 percent of the tree canopy is removed, or if root-pruning is involved, additional requirements may apply.
• If the pruning constitutes tree topping (cutting the normal top off the tree and removing its leading stem), a type I street tree removal permit is required. Tree topping often leads to the tree re-growing in ways that make it unstable or tree death.

More information about pruning

• Pruning mature trees
• Poda de árboles adultos
• Choosing a qualified arborist
• Por qué contratar a un arbolista?

Property owners are responsible for the care and maintenance of street trees located in the public right-of-way next to their properties.

Street trees

Trees located in the public right-of-way between the curb, or edge of roadway, and the property line are street trees. Because street trees are located in the right-of-way, they are regulated by the City and can’t be cut down or planted without a free Type I tree removal. Additionally, the trees must be replaced using the street tree list.

If you are interested in adding more trees on your block, the City’s street tree list offers lots of choices for trees that don’t grow too high, block sun or views, and that thrive in our climate.

Why are street trees a big deal?

The street trees on your block are so much more than just trees. In addition to making a street look more appealing:

• Cars drive more slowly on streets with trees.
• Street trees cut traffic noise.
• Residents walk more on streets with trees.
• Trees increase property value.
• Trees improve air quality.

Trees and sidewalks

When a street tree lifts the sidewalk in front of your house, the sidewalk must be repaired.

• Have a tree care professional provide an assessment and estimate for root-pruning or removal of a tree.
• Contact the City's Public Works Inspector at 503-618-2105 to evaluate sidewalk damage. After the inspection you will need to visit the Permit Center at City Hall to apply for a right-of-way permit. Contact Permit Services at 503-618-2845 for more information.
• If a street tree causing sidewalk damage requires removal to accommodate sidewalk repairs, you must contact the Planner on Duty at 503-618-2780 or POD@GreshamOregon.gov and submit a Type I street tree removal permit.

• Tree planting and care
• Right tree in the right place

Planting

• When to plant: The best time to plant a tree is when the tree is dormant during the winter months. Trees should be planted between Oct. 1 and April 30 to give them the best change of survival.
• Compact soil: Be sure not to pack the soil too tight when planting the tree. Compact soil makes it difficult for roots to grow outward and downward, which can result in raised sidewalks and an unhealthy tree.
• Mulch: To hold in moisture and discourage the growth of competing weeds, spread mulch around the base of the tree. The mulch should be about four inches deep and kept about six inches from the trunk of the tree. Mulch could include grass clippings, compost, or bark dust.
• Stakes: The tree should be staked for at least the first year after planting. The stakes should be tied loose enough that the tree can sway two inches from side to side.

More about planting new trees

• Planting a new tree
• Plantación de nuevos árboles

Care

• Trees need water: Your new tree will need 5-10 gallons of water once or twice a week for the first three years after planting. Watering your tree slowly and evenly will promote deep root growth; over watering your tree will promote shallow root growth which will result in raised walkways. A five-gallon bucket with small holes in the bottom is an excellent method for watering your plant slowly. 
• Weed around your tree: Other plants around the tree are competing for water. Be sure to remove competing plants several feet around the base of the tree.
• Bark damage: Take care when mowing around the tree, bark damage can weaken the tree and make it susceptible to disease. 
• Remove dead branches and suckers: Remove all dead branches in the tree canopy and suckers located at the base of the tree. This will allow the tree to focus its energy where it is needed and desired. 

More about pruning young trees

• Pruning young trees
• Poda de árboles jóvenes

What are significant trees?

Significant trees are trees adopted by the City, with the approval of the property owner, as trees of significance to Gresham. The significance may be related to a historic event, uniqueness of shape or species, location, age or functionality.

Removal of a significant tree must be approved by a Type III hearings official decision, based on criteria in Section 9.1000 of the Development Code.

• Take a tour through Gresham's significant trees
• Downtown Gresham self-guided tree walk
• View the location of significant trees in Gresham Map (turn on the significant tree layer)

Nominate a tree

The preservation of significant trees enhances Gresham's livability, history and is an opportunity for recognition and education. Nominate a tree by submitting a significant tree nomination form:

Urban Forestry Subcommittee
Attn: Tina Osterink
1333 NW Eastman Parkway
Gresham, OR 97030

You may also drop off the forms at City Hall or email them to Tina.Osterink@GreshamOregon.gov or call 503-618-2392.

Gresham has been designated a Tree City USA by the National Arbor Day Foundation. This honor is the result of work recognizing trees as an important part of Gresham's quality of life. 

International Society of Arborculture

Oregon Department of Forestry - Urban Forests

Oregon State University Extension Service

Urban Forestry Subcommittee

Tree planting and care

Staking deciduous trees

Tree protection detail: chain link fence

Tree protection detail: snow fence