Category: Rain

In Tacoma, twice a year is the minimum: once in late spring after the seed and blossom drop, and once in fall before the rain settles in. If your roof sits under Douglas fir, cedar, or big-leaf maple, three times a year is closer to right, because conifers shed steadily instead of all at once. The fall cleaning is the one that matters most. Tacoma gets about 76 percent of its annual rain between October and March, so a September cleaning lands ahead of the season and a November one is already inside it.

What the Rain Data Actually Says

Most gutter advice says “twice a year” and stops there. But when to clean gutters in Tacoma is a question our rainfall answers pretty precisely, using NOAA’s 1991 to 2020 climate normals.

Tacoma averages 40.8 inches of precipitation a year, but it does not arrive evenly. July averages 0.6 inches. August is 0.8. Then the line bends hard: September 1.6, October 4.1, November 6.5, December 6.0.

Add up October through March and you get 31.0 inches, which is about 76 percent of the year’s total falling in six months. The other six months split the remaining quarter. That is the whole argument for timing your cleaning instead of picking a random Saturday.

The Deadline Nobody Tells You About

Look at the jump from September to October. Rainfall goes from 1.6 inches to 4.1 inches, and October alone averages 15 days with precipitation. That is not a gradual shift into fall, it is a switch flipping.

Here is the corroborating detail, and it comes from the City of Tacoma rather than a weather chart. The city moves its street sweepers onto the leaf-season schedule “starting the third week in October,” abandoning the fixed residential routes because of the volume of leaves coming down.

Think about what that means for your roof. If the city considers leaf volume a citywide problem by the third week of October, your gutters have been collecting that same debris for weeks already, and the heaviest rain of the year is a few days out. A cleaning booked for September is preventive. One booked for late October is remedial. Same service, very different outcome.

The Tacoma Gutter Calendar

Gutter Cleaning Frequency, Honestly

The right number depends less on the calendar than on what is growing over your house.

Twice a year is right for most Tacoma homes with an open lot or only distant trees. Clean in May after the spring drop finishes, and again in September before the rain.

Three times is the realistic number if you have Douglas fir, cedar, or pine directly overhead. Conifers do not have a tidy leaf-drop season, they shed needles all year, and needles are worse than leaves because they pack into a dense mat in the bottom of the trough instead of sitting loosely on top. Add a midwinter check to the May and September visits.

Four times, or gutter guards, is worth considering if you have heavy mixed cover, a roof valley that funnels debris into one spot, or a two-story roofline that makes DIY checks genuinely unsafe. At that point you are paying for cleanings often enough that a guard system starts to pencil out.

One thing worth saying plainly: more frequent cleaning does not fix a gutter that is pitched wrong or short on downspouts. If yours overflow within weeks of a cleaning, the problem is the system, not the schedule.

Why the Timing Matters More Here

A clogged gutter in a dry climate is a nuisance. A clogged gutter in Tacoma in November is a system pushing 6.5 inches of water somewhere it should not go, over 19 separate days.

Overflow runs down the fascia and rots the wood the gutter is hanging on. It sheets against siding and windows. It pools at the foundation during the exact months the soil is already saturated and has nowhere to put more water. None of it happens suddenly, which is why it goes unnoticed until something expensive shows up. For a fuller look at what actually ends up in a Tacoma gutter and how fast, see our guide to local debris.

Book Before the Rain, Not During It

Here is the practical reality of this trade in the Pacific Northwest: everyone calls at the same time. The phone starts ringing the week of the first real storm, which is usually mid to late October, and by then the calendar is already tight. The homeowners who get the convenient appointment are the ones who booked in August or September, before anything was visibly wrong.

If you are reading this in summer, that is the good news. You have room to choose your date. Our gutter cleaning service covers the gutters and the downspouts by hand, with an inspection that flags loose hangers and early rot while the ladder is already up. If you would rather not think about it twice a year, the maintenance program puts you on a schedule so the timing takes care of itself.

Schedule online and pick your window while there are still windows to pick.

Frequently Asked Questions

When Should You Clean Gutters in Tacoma?

Clean twice a year: once in May after the spring seed and blossom drop finishes, and once in September before the wet season starts. September is the more important of the two, because Tacoma gets roughly 76 percent of its annual rain between October and March. Homes under conifers should add a midwinter cleaning.

How Often Should You Clean Your Gutters?

Twice a year is the minimum for most Tacoma homes. Three times is more realistic under Douglas fir, cedar, or pine, because conifers shed needles year round and needles pack into the bottom of the trough. Heavy mixed tree cover or a debris-collecting roof valley can justify four visits a year or a guard system.

What Is the Best Time to Clean Gutters in the Pacific Northwest?

Late summer through September. The dry season means debris is loose and easy to clear, access is safe, and the work lands before October, when Tacoma’s rainfall jumps from 1.6 inches to 4.1 inches. Waiting until the rain starts means cleaning a wet, heavy mat during the season instead of ahead of it.

Is October Too Late for Fall Gutter Cleaning in Tacoma?

Not too late to be worth doing, but you are behind the curve. The City of Tacoma shifts its street sweepers to the leaf-season schedule the third week of October because of leaf volume, and gutter schedules fill up the same week. A cleaning in October still helps; September is the window you actually want.

Tacoma gets about 40.8 inches of rain a year, and most homes here handle it fine on standard 5-inch K-style gutters. The houses that genuinely need 6-inch have something specific going on: a large roof plane, a steep pitch, too few downspouts, or Douglas fir dropping needles into the trough all winter. Rainfall alone rarely decides it in Pierce County. Here is how the sizing works, and how to tell which house you have.

Start With the Local Math

Tacoma averages 40.8 inches of precipitation a year, a little wetter than Seattle’s 39.3, based on NOAA’s 1991 to 2020 climate normals. November is the wettest month at 6.5 inches.

Look closer at that November figure, though. Those 6.5 inches arrive across roughly 19 rainy days, about a third of an inch a day. Our rain is persistent, not violent. The City of Tacoma’s own surface water manual says the same thing: the 2-year design storm is 2.0 inches over 24 hours, and even a 100-year event is 4.1 inches over 24 hours.

That matters more than any other number here, because gutter capacity is a question of inches per hour, not inches per year. A Gulf Coast thunderstorm drops two inches in an hour; here, two inches takes a day. Which is why 5-inch is honestly enough for a lot of Tacoma homes, provided it is clean, correctly pitched, and has enough downspouts.

Roof Area Is the Real Variable

Gutters are sized to the roof area draining into them, not to the square footage of the house. A 5-inch K-style gutter holds roughly 1.2 gallons per linear foot; a 6-inch holds about 2.0 gallons, close to 65 percent more. At the one-inch-per-hour intensity these charts assume, a 5-inch run is rated for about 5,500 square feet of roof and a 6-inch for about 7,960.

Those numbers look generous until you divide the roof up, because what counts is the area feeding each run. One long gutter catching a wide roof plane with one downspout at the far end is a different job than the same footage split across four runs. It is why two houses of identical size can need different gutters.

Pitch Multiplies the Load

A steeper roof behaves like a bigger roof. The standard adjustment factors:

• Flat to 3/12 pitch: no adjustment
• 4/12 to 5/12: add 5 percent
• 6/12 to 8/12: add 10 percent
• 9/12 to 11/12: add 20 percent
• 12/12 and steeper: add 30 percent

The charts miss a second effect. On a steep roof, water leaves the edge with real momentum and can shoot straight over a narrow trough. That is not an overflow problem, it is an aim problem, and cleaning will never fix it. A 6-inch trough catches what a 5-inch throws past.

Why a Perfectly Clean 5-Inch Gutter Still Overflows

This is the part homeowners find maddening: cleaned in September, spilling over the front edge in November anyway. Usually one of three things is happening.

The trough is losing cross-section to debris. Under Douglas fir and big-leaf maple, needles and seed pods pack into a dense mat. A 5-inch gutter with an inch of packed needles has lost a large share of its capacity, and it did not take long. A 6-inch gutter under the same tree still has usable depth. In Tacoma, debris tolerance is the most common real reason to size up, not rainfall.

The water is concentrated at one point. Roof valleys funnel a large area into a narrow stream that hits the gutter in one spot. That spot overflows while the rest of the run sits half empty.

Or the outlets cannot keep up, which brings us to the part that gets ignored.

Downspout Size: 2×3 vs. 3×4

A gutter is a holding channel. Downspouts are the drain. Get the drain wrong and the size of the channel stops mattering.

A 2×3 inch downspout handles roughly 600 square feet of roof. A 3×4 handles about 1,200, roughly double. One downspout per 40 feet of run is the common minimum, and under heavy tree cover every 30 feet is the better target. Valleys and inside corners usually justify one of their own.

Here is the pairing that matters: 6-inch gutters on 2×3 downspouts create a bottleneck. The trough fills faster than the outlets can empty it and you have paid for capacity you cannot use. Six-inch belongs on 3×4. That is why the two upgrades are quoted together.

A Gutter Sizing Guide for Tacoma Homes

Treat this as a starting point, not a verdict. Tree cover, valley placement, and fascia condition can all move a house a row in either direction.

When 5-Inch Is Still the Right Answer

Plenty of Tacoma homes do not need the upgrade, and we would rather tell you that than sell it. A one-story or modest two-story with roof planes under about 1,200 square feet, a moderate pitch, enough downspouts, and no conifer overhead will do fine on 5-inch seamless aluminum for decades.

And 6-inch will not fix the wrong problem. If gutters overflow because the pitch is off, the hangers loosened, or there are three downspouts where there should be six, a wider trough just gives the water a bigger place to sit. Correcting slope, adding outlets, rehanging on hidden hangers, or adding gutter guards is often the better use of the same money. Diagnose first.

One Detail Nobody Local Talks About

One piece of metal matters almost as much as gutter size and almost never comes up in a quote: the gutter apron. It is the flashing that carries water off the roof edge into the trough instead of letting it wick backward onto the fascia. Without it, you can get rot behind a gutter that drains perfectly. It deserves its own post, and we will give it one.

How We Size It

We measure the roof planes, note the pitch, count the valleys, look up at what is growing over the house, and then recommend a size. Often that recommendation is 5-inch, and we say so. For the money side, our guide to what new gutters cost in Tacoma covers what the size decision does to the price.

When you are ready, see our gutter installation service or request a free quote.

Frequently Asked Questions

What Size Gutters Do I Need?

Most homes need 5-inch K-style gutters. Step up to 6-inch when a single gutter run drains more than about 2,500 square feet of roof, the pitch is steeper than 6/12, or heavy conifer debris keeps cutting into the trough’s capacity. The roof area feeding each run matters more than the size of the house.

Are 6-Inch Gutters Worth It for Heavy Rain in Tacoma?

Sometimes, but rainfall intensity is rarely the reason here. Tacoma’s 40.8 inches a year arrive at moderate intensity, spread across many days. The stronger local arguments for 6-inch are large or steep roof planes and constant fir and maple debris, which eats into a 5-inch trough’s usable depth much faster.

What Is the Difference Between 2×3 and 3×4 Downspouts?

A 2×3 downspout drains roughly 600 square feet of roof and a 3×4 drains about 1,200, close to double. A 3×4 also clogs less readily on needles and seed pods. Six-inch gutters should always be paired with 3×4 downspouts, otherwise the outlets bottleneck the extra trough capacity.

Are K-Style Gutters a Good Choice in Tacoma, WA?

Yes, and they are the standard here. K-style holds significantly more water than a half-round of the same nominal width, which is why a 5-inch K-style is rated for roughly twice the roof area of a 5-inch half-round. Half-round is mainly chosen on historic homes for appearance.