Clogged Gutters in Fall: A Portland Leaf-Season Calendar
The first fir needles of the season came down in last week's wind, the bigleaf maples in Laurelhurst are just turning, and the sweetgums along the east-side streets will not let go until the first frost. Portland does not have one leaf drop. It has a series of them, spread across three months, and the timing of your gutter cleaning should match the trees over your roof rather than a date on a calendar.
The Portland drop calendar
Douglas fir — all year, peaks now and after every windstorm. Fir does not drop its needles in one go. It sheds old growth continuously, with a heavy pulse in late summer and early fall, and every gale from November on knocks down more. Needles do not clog a gutter so much as felt it: a flat brown mat on the bottom that water seeps through slowly. Under a big fir, the gutters are never truly clean.
Western red cedar — September to November. Cedar sheds whole sprays of flat foliage that turn orange and come down in the fall wind. They mat like wet paper and slide into outlets in a sheet.
Bigleaf maple — mid-October to mid-November. Leaves the size of a dinner plate. These are the ones that fill a gutter in a weekend. They also break down fast, which is good for the compost and bad for the gutter, because by December they are a sludge.
Sweetgum, red oak, pin oak — November to December. The street trees the city planted through the east side. Oak leaves are leathery and hang on until a hard frost; sweetgum drops leaves in November and its spiky seed balls all winter. Both go late, which is why a mid-October cleaning under oaks is a waste of money.
Birch, cherry, plum, dogwood — October, then again in spring. Small leaves in fall, then a blossom drop in March and April that is its own cleaning trigger.
When to clean
The rule is simple: clean after your heaviest tree has finished, not before. Under maple that is mid-November. Under oak and sweetgum it is early December. Under fir it is whenever the last cleaning was more than four months ago, plus once after the first big windstorm.
For most Portland homes that works out to:
- Late November to early December — the main fall cleaning, after maple and most oak, before the heaviest rain of the year in December and January
- Late April to May — after blossoms, cottonwood fluff and the spring needle pulse
- A third visit in August or September if the house sits under Douglas fir
Cleaning in September because the calendar says "fall" gets you a full gutter again by Thanksgiving. If you can only afford one visit, make it the December one. Gutter cleaning in Portland runs $130–$320 by home size, and the fall visit is the one most likely to turn up a repair.
What a full gutter does in a Portland winter
A gutter packed with maple leaves in December does not just overflow. It holds water from then until May. That water:
- Soaks the fascia behind the gutter every day it rains
- Adds weight — a full 5-inch gutter carries about 1.5 gallons per foot, 12 pounds a foot — that pulls old spike hangers out
- Freezes solid during a Gorge east-wind cold snap and splits downspouts
- Grows moss by February, which then holds sediment and needles through the summer
That is the chain that turns a skipped $180 cleaning into a $400 re-hang and a $600 fascia job.
Where guards fit
Under bigleaf maple, oak and sweetgum, a basic aluminum screen guard ($5–$9 a foot) stops the leaves and pays for itself in two or three skipped cleanings. Under Douglas fir and cedar, only fine stainless micro-mesh ($10–$20 a foot) actually sheds needles; screens let them straight through and reverse-curve hoods hold them on the nose. Under a mix of fir and maple — which describes most of the west side and Lake Oswego — micro-mesh is the only one worth the money.
Guards do not remove the need to look. Micro-mesh under fir needs a leaf-blower pass or a hose-off along the roofline once a year to clear the felt off the top. The gutter guards page has the honest version of what each type does under each tree.
The quick checklist for this week
- Identify the trees within 30 feet of the roof.
- Circle the month the biggest one finishes dropping.
- Book the cleaning for the two weeks after that.
- Between now and then, check that every downspout runs clear — pull the bottom elbow and look.
- Flip down the downspout extensions before the November rain.
If you get up there yourself, go by hand, into a bucket, and stay off wet moss on the roof. If you would rather not, the cleaning visit includes the ladder inspection that catches the sagging run or the soft fascia before the winter does.
Signs of clogged gutters you can see from the ground
You do not need a ladder to know when it is time. Clogged gutters give themselves away:
- Water spilling over the front lip in an ordinary drizzle
- A downspout that stays silent while the rain is falling
- Plants or seedlings growing out of the trough
- A run that sags or pulls away from the fascia under the weight
- Dark streaks down the fascia or siding below the gutter
- Leaves or needles visible above the lip from the street
If you see two or more of these, the trough is likely full, and the downspout below it may be packed too.
Clearing a packed downspout
A clogged downspout is often the real problem behind a full gutter. To clear one:
- Pull the bottom elbow off, or loosen its screws.
- Look up the downspout with a flashlight to find the plug.
- Push a garden hose up from the bottom with the water on gently, or tap the side of the downspout to loosen the plug.
- If that fails, work from the top with a plumber's snake, never a stiff rod that could puncture the seam.
- Run water from the top until it flows clear, then refit the elbow.
If the same downspout clogs every fall, the outlet above it is probably the small original size. Upsizing it is the lasting fix.
Mistakes in leaf season
Cleaning too soon. A September visit under maple and oak is a full gutter again by December.
Cleaning once and forgetting the fir. Needles keep coming after every windstorm, all winter.
Leaving the debris on the roof. Leaves raked onto the shingles wash straight back into the trough.
Composting fir needles in a pile against the house. They hold water against the siding.
Ignoring the neighbor's tree. A big maple next door counts as one of your trees if it hangs over your roof.
Planning by neighborhood
Tree cover changes the plan more than anything else. East-side streets lined with oak and sweetgum need a later fall cleaning than west-side lots under fir. Older neighborhoods with big maples see the heaviest single drop in late October. Newer subdivisions with young street trees can often manage with one cleaning a year until the trees grow. Look at what is actually over your roof, and set the calendar from that.
Is it worth paying for an extra visit?
Compare the cost of one more cleaning with what a clog can cause. A typical single-story cleaning runs $130–$220. A sagging run pulled loose by a full trough is $150–$320 to re-hang, and soft fascia behind it is $10–$24 a foot. Water dumped at the foundation all winter can cost far more. Under a heavy tree, the extra visit is usually the cheaper choice. Under a light one, one well-timed cleaning is plenty.
Whatever you decide, write the plan down: which trees, which weeks, and who is doing the work. Next fall you will not have to work it out again.
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