Lawn maintenance standards in Montreal: what every homeowner needs to know

If you own property in Montreal, you're legally responsible for how your lawn looks. That might sound surprising, but the city's maintenance standards for private property are specific, enforceable, and they vary from one borough to another. This is a breakdown of what the rules actually say and what you need to do to stay compliant.

Grass height limits by borough

Montreal doesn't have a single grass height rule. Each borough sets its own maximum, and the differences are significant. According to the City of Montreal's maintenance standards page, the limits break down like this:

15 cm maximum:

• Cote-des-Neiges-Notre-Dame-de-Grace
• Lachine
• Le Plateau-Mont-Royal
• Le Sud-Ouest
• Mercier-Hochelaga-Maisonneuve
• Rosemont-La Petite-Patrie
• Saint-Leonard
• Villeray-Saint-Michel-Parc-Extension

20 cm maximum:

• Anjou
• Montreal-Nord
• Saint-Laurent
• Verdun

25 cm maximum:

• Ahuntsic-Cartierville

30 cm maximum:

• L'Ile-Bizard-Sainte-Genevieve
• Pierrefonds-Roxboro
• Outremont

No specific maximum (must still mow regularly):

• Ville-Marie

If you live in Le Plateau and let your grass grow to 20 cm, you're already out of compliance. In Pierrefonds-Roxboro, you'd still have 10 cm of room. Knowing your borough's threshold matters.

Exemptions for gardens and ornamental plants

If you garden, you get some breathing room. According to the same city maintenance page, herbs grown for harvest and ornamental herbaceous plants that have been intentionally sown or planted are typically excluded from these height restrictions. So if you've planted wildflowers, tall grasses for landscaping, or a herb garden, those won't count against you as long as they're clearly intentional.

Weed control is your responsibility

The city doesn't just care about grass height. Property owners in Montreal are prohibited from allowing noxious or undesirable weeds to grow unchecked. Ragweed is a particular concern across the island due to its impact on public health and allergy sufferers. If your property has a ragweed problem, the borough can take notice.

Under the maintenance regulations, keeping your yard free of harmful weeds isn't optional. It's an obligation tied to property ownership.

You're responsible for the city strip too

Many homeowners don't realize this, but you're also responsible for maintaining the public strip of land between the sidewalk (or curb) and your private property line. Whether it's in front of or beside your building, that strip is your maintenance obligation. If the grass is overgrown or weeds are taking over in that zone, the borough can hold you accountable.

What's prohibited on your property

Montreal's maintenance standards go beyond grass. According to the City of Montreal, it's prohibited to store any of the following on your property:

• Garbage and debris
• Construction materials and metal structures
• Vehicle carcasses
• Pruning waste and scrap metal
• Dead animals and foliage
• Manure, brush, and needles
• Hazardous waste

Your ground must also be leveled properly to prevent water accumulation. Properties can't be left as bare clay or dirt. You're expected to maintain lawns, gardens, or some form of landscaping.

Tree branches can't obstruct public areas

If tree branches from your property extend over sidewalks, streets, or other public areas, you're expected to trim them. Branches that obstruct public property can lead to enforcement action. This applies to both front-yard and side-yard trees that overhang public space.

How enforcement works

When someone reports a property maintenance issue, the process starts with a call to 311 (or 514-872-0311 from outside Montreal). The line is open Monday through Friday from 8:30 a.m. to 8:30 p.m. and weekends and holidays from 9 a.m. to 5 p.m.

After a complaint, borough inspectors assess the property. The typical enforcement path starts with a notice, followed by a deadline to correct the issue. If the problem isn't resolved, the city can step in with a contractor and bill the property owner for the work. Fines for property maintenance violations can be issued, though exact amounts vary by borough and the nature of the infraction.

Practical tips for staying compliant

Know your borough's rules. The difference between a 15 cm limit and a 30 cm limit is substantial. Check the city's maintenance standards page and select your borough.

Set a mowing schedule. During peak growing season (late May through September), weekly mowing keeps most lawns safely under the limit.

Don't forget the city strip. The boulevard between the sidewalk and street is your responsibility too. Include it in your regular routine.

Control weeds early. Ragweed and other noxious weeds spread fast in summer. Pull them before they go to seed, or overseed your lawn to crowd them out.

If you have a pollinator garden, herb patch, or ornamental grasses that grow tall, keep them clearly defined. Inspectors need to see that tall plantings are deliberate, not neglect.

Need help keeping your lawn compliant?

Staying on top of Montreal's maintenance standards is easier with a reliable landscaping schedule. If you need help with regular mowing, weed control, or general property maintenance, give us a call at 514-900-3867. We know the rules borough by borough and can keep your property in good standing all season.