Calgary Tree Bylaws: What Every Homeowner Should Know

Calgary takes its urban forest seriously. The city maintains over 7 million trees across public and private land, and several bylaws exist to protect them. As a homeowner, understanding these rules helps you avoid fines, protect your investment, and be a good neighbour. Here is a plain-language summary of what matters most.

The Street Bylaw and Boulevard Trees

The strip of land between your property line and the street, including the area between the sidewalk and the curb, belongs to the City of Calgary. Trees planted in this area are city property, even though you mow the grass and shovel the sidewalk next to them. Under the Street Bylaw 20M88, you cannot prune, remove, or damage boulevard trees without authorization from the City.

This means you cannot trim branches that are in the way of your vehicle, remove roots that are lifting your driveway, or take down a boulevard tree that is blocking your view. If a city tree is causing a legitimate issue, you can submit a service request through 311. An urban forester will assess the situation and take appropriate action if warranted.

If you accidentally damage a city tree during construction, landscaping, or other work, you could be held liable for the tree's appraised value, which can be substantial for a large, mature specimen.

The Parks and Pathways Bylaw

Trees in parks, green spaces, environmental reserves, and along pathways are protected under Bylaw 20M2003. This applies to community green spaces, escarpment areas, and natural areas that border many Calgary neighbourhoods. You cannot remove vegetation, damage trees, or clear brush in these areas without City approval.

This is particularly relevant for homeowners with properties backing onto parks or natural areas. Even if branches from these trees overhang your yard, you need to be careful about how you prune them. Cutting back to the property line is generally acceptable, but harming the tree's health or removing major limbs requires City involvement.

Dutch Elm Disease Prevention

Alberta is one of the few places in North America where Dutch Elm Disease has been largely contained, thanks to aggressive prevention programs. Calgary's Community Standards Bylaw supports provincial regulations that restrict elm pruning to October 1 through March 31. During the April through September ban period, fresh pruning cuts can attract the elm bark beetles that carry the DED fungus.

This applies to all elm trees, on private and public property alike. If you hire a tree company that prunes your elm in July, both you and the company could face enforcement action. The only exception is emergency situations where an elm poses an immediate safety hazard.

If you suspect a tree of having Dutch Elm Disease, look for yellowing and wilting on individual branches, often called flagging, especially in summer. Report suspected cases to 311. The City will send an inspector to test the tree and, if positive, remove it promptly to prevent spread.

Development and Construction Rules

When a development permit is required for construction on your property, the City's planning department assesses the impact on existing trees. Significant trees, generally defined as those with a trunk diameter over a certain threshold, may require protection measures during construction.

Tree protection typically involves installing rigid fencing around the tree's root zone before any construction activity begins. The root protection zone extends well beyond the trunk, usually out to the drip line. No digging, grading, material storage, or vehicle traffic is allowed within this zone.

If trees must be removed for the project, the development permit may require replacement plantings at a specified ratio. This ensures that Calgary's overall tree canopy is maintained even as development occurs.

Your Responsibilities as a Homeowner

While the City does not generally regulate what you do with trees on your own private property, a few responsibilities come with homeownership:

• Maintain trees so they do not create hazards for neighbours, pedestrians, or vehicles on public roadways.
• Keep branches trimmed to provide adequate clearance over sidewalks, typically 2.5 metres, and roadways, typically 4.5 metres.
• Do not prune any elm tree between April 1 and September 30.
• Do not damage, prune, or remove city-owned trees, even if they border or overhang your property.

When in doubt about any tree-related bylaw or responsibility, calling 311 or consulting with a certified arborist is always the smart move. The rules exist to protect Calgary's urban forest, which benefits every resident.