When to Clean Your Gutters — and How Often

Gutter cleaning is one of those tasks that’s easy to put off — until something goes wrong. A clogged gutter in the wrong season can lead to overflowing water, damaged fascia, flooded basements, and ice dams that tear the system right off your roofline.

The good news is that staying ahead of it doesn’t take much. Two cleanings a year, timed right, will handle the vast majority of homes in Ontario.

The Two Cleanings Every Home Needs

Most homes need their gutters cleaned twice a year. The timing matters as much as the frequency — cleaning too early means you’re back up there again a month later, and cleaning too late means the damage may already be done.

Late Spring Clean

When: After seeds and blossoms have fallen — typically May to early June in Ontario.

Why: Tree seeds, helicopter seeds, and spring blossoms accumulate fast and compact into a paste that blocks downspouts.

Late Fall Clean

When: After the last leaves have dropped — typically late November in Ontario, before freeze-up.

Why: Heading into winter with full gutters almost guarantees ice dams, overflow, and fascia damage before spring.

The Late Spring Clean — Why Timing Is Everything

A lot of homeowners think about gutters in the fall when leaves are dropping and forget about spring entirely. That’s a mistake — spring can actually be harder on your gutters than fall.

Ontario springs bring a heavy load of tree seeds, maple helicopters, cottonwood fluff, and tree blossoms. Unlike dry leaves, this material compacts and forms a dense, wet paste in the bottom of your gutters that is far more effective at blocking downspouts than loose leaves.

• Wait until the trees in your area have fully finished dropping seeds and blossoms — typically late May to early June depending on your neighbourhood.
• Cleaning too early in April or early May means another load is coming and you’ll need to do it again.
• A blocked downspout from spring debris means every summer rainstorm overflows at the corners and drips along your foundation.

Not sure if your spring clean is due? Run a garden hose into the top of each downspout. If water backs up instead of flowing freely, it’s time. A clear downspout in a clean gutter drains almost instantly.

The Late Fall Clean — The Most Important One

If you only do one cleaning a year, make it the fall — and time it right. The goal is to clean after the last leaves have come down, but before the ground freezes and temperatures drop consistently below zero.

In most parts of Ontario, that window is late November. It’s a narrower window than spring, so don’t let it slip.

• Heading into winter with full gutters almost guarantees ice dams — water trapped under debris freezes and expands, forcing its way under shingles and tearing at joints.
• Heavy, wet, frozen debris adds significant weight to your gutters, pulling fasteners out of the fascia and causing sags.
• Overflow from blocked gutters in a winter rainstorm freezes on walkways and driveways — a safety hazard that’s entirely preventable.
• A clean gutter going into winter drains freely, sheds ice naturally, and puts far less stress on the whole system.

Don’t clean too early in fall. Cleaning in October when the trees still have half their leaves means doing it twice. Wait until most leaves have fallen in your area — typically after the first hard frost has knocked the last ones loose.

When You May Need to Clean More Often

Twice a year is the baseline for most homes. But some properties need more frequent attention:

• Heavy tree coverage — homes surrounded by large deciduous trees or pines may need a third cleaning in midsummer as well.
• Pine trees — pine needles fall year-round and are particularly good at packing tight in downspouts.
• After a major storm — a windstorm that drops a lot of branches and debris is worth a follow-up check, especially in spring or fall.
• If you’ve had overflows before — a home that has shown overflow problems in the past likely has undersized gutters or more debris load than average, and benefits from an extra inspection.

Signs Your Gutters Are Overdue for a Clean

If you’re not sure whether it’s time, your gutters will usually tell you:

• Water overflowing over the edge of the gutter during rain — not from a downspout.
• Plants growing out of the gutters — seeds and soil have had long enough to take root.
• Sagging sections — debris has built up enough weight to pull the gutter down.
• Staining or streaking on the siding below the gutter line.
• It’s been more than a year since the last cleaning.