Seasonal

Fall Leaves in Your Gutters: A Tree-by-Tree Timing Guide

By Pittsburgh Gutter Repair · September 17, 2026 · 7 min read

The leaves are just starting to turn on the hillsides as this is written, and in six weeks most of them will be in someone's gutters. Pittsburgh has more tree canopy than almost any large city in the country, and the trees that make the streets — silver maple, Norway maple, pin oak, red oak, sycamore, black locust — each drop on their own schedule. Clean too early and you do it twice. Clean too late and the first freeze turns a wet leaf plug into a block of ice. Here's the calendar.

Who drops when

When to clean

One cleaning, done right, in the second half of November. That's after the maples, after most of the oaks, after the sycamores. If the house is under pin oaks, push it to the last week of November or the first of December; they hold on longer than anything. The goal is to go into the first hard freeze — usually early to mid-December here — with the gutters empty and the downspouts flowing, because a wet leaf plug at the outlet is what becomes the ice plug that splits the elbow and the ice dam that pulls the hangers. A gutter cleaned on October 20 under a Norway maple is full again by November 10.

A second, lighter pass in June for the maple seeds, which sprout in a gutter with alarming enthusiasm. That's a separate topic; the November cleaning is the one that saves you money.

What a fall cleaning should include

Scooped by hand into a bucket, not blown onto the neighbor's roof. Every downspout flushed from the top with a hose and checked for flow at the bottom — the flush matters more than the scoop, because the plug is always at the outlet. And a look at the hangers and the fascia while the ladder is up, because loose hangers in November are the gutter on the lawn in February. A gutter cleaning is usually priced by the size of the house, typically $120–$200 for a single story and $180–$300 for a two-story, and a good one includes the ladder check.

Guards, and which trees justify them

Under two small ornamentals in a Cranberry cul-de-sac, guards are a waste. Under a pair of silver maples on a Dormont street, they pay for themselves in six to eight years against twice-yearly cleaning. The type matters by tree:

• Maples: stainless micro-mesh. The helicopters go through every screen and reverse-curve hood on the market and sprout on the other side.
• Oaks and sycamores: an aluminum screen keeps the big leaves out for $5–$9 a foot. Mesh is better; screen is enough.
• Locust and tree-of-heaven: micro-mesh again. The leaflets are small enough to go through a screen.
• Hemlock and spruce: anything you install will need a brush-off once a year; needles lie flat on mesh. Guards still help, but don't expect zero maintenance.

One warning for this climate: solid reverse-curve hoods ice over and give an ice dam a shelf to build on. They're a poor choice on north-facing eaves here. The gutter guards page has the prices and the comparison.

What a wet mat does

A layer of dry leaves isn't the problem. Wet ones are. After a few rains they pack into a dense mat that holds water like a sponge and weighs far more than it looks. It pulls on the hangers, keeps the bottom of the trough wet for weeks, and feeds the rust on old steel. At the outlet it forms a plug that backs water up the whole run. When the first hard freeze arrives, all of that water turns to ice.

Signs the gutters are full

• Water spilling over the front edge in an ordinary rain
• Debris or seedlings visible above the lip from the ground
• A downspout that stays quiet while it rains
• A run that has started to sag in the middle
• Dark stains on the fascia below

Clearing the roof, too

On low-slope roofs, in valleys and behind chimneys, debris piles up on the roof itself and washes down with every rain. Clearing the trough without clearing the valley above it means it's full again after the next storm. Ask whoever does the cleaning whether valleys and the area behind the chimney are included. Piles of wet debris on the roof also hold moisture against the shingles, which shortens their life.

Where the debris goes

What comes out is mostly leaves, seeds and roof grit. The leaves can go on a compost pile or out with the fall yard-waste collection most municipalities run; check your municipality's schedule. Keep the grit from asphalt shingles out of a vegetable garden.

If you can't get to it in time

If the first freeze is coming and the troughs are still full, clear the downspout outlets at minimum. An open outlet lets meltwater drain even when the run is partly full, and the outlet plug is what does the most damage in winter. Then book the full cleaning for the next mild, dry spell.

A note on blowers and gutter attachments

Leaf blowers with gutter attachments, and wands that reach up from the ground, work on dry, loose debris on a single-story house. They don't do much once the mat is wet and packed, and they can't flush a downspout. Use them as a mid-season touch-up, not a substitute for the late-November cleaning.

Neighbors' trees

You don't need a tree in your own yard to have a full gutter. In the city and the older suburbs, houses sit close together under shared canopy, and a big silver maple two doors down can fill your gutters as surely as your own. Look at what's actually above your roof in October, not just what's on your lot. If an overhanging limb belongs to a neighbor, a friendly conversation about trimming is usually the cheapest gutter guard there is. Note that trimming a tree on someone else's property is their call, so ask first.

Keeping a simple record

Each fall, write down the date you cleaned, how full the troughs were, and which runs were worst. After two or three years, you'll know your own house's calendar better than any table: which side fills first, whether one cleaning is enough, and whether guards would pay for themselves on one run even if they don't make sense on the rest. A phone note with a photo of each side, taken the same week every year, is all the record you need.

Doing it yourself

Single-story house, good ladder, someone holding it: fine. Gloves, bucket hooked on the ladder, and flush each downspout from the top. Stop when the ladder would have to lean on the gutter, when you'd be reaching sideways, or when the ground on the downhill side is a story below the eave — which describes many houses in the city. Wet November leaves are heavier than they look, and the ladder feet slide on wet leaves on a sloped lawn. The storm-season checklist covers what to look at while you're up there, and if you find a corner dripping or a hanger loose, the gutter repair page has what each fix costs.