Learning how to clean gutter downspouts is a separate job from clearing the gutter trough: the trough is the horizontal channel along the roof edge, while the downspout is the vertical pipe that carries water to the ground. A downspout clogs where you cannot see it, usually at the top elbow or the bottom outlet, so the fix is to find where the blockage sits and then match the method to it. Most homeowners can clear a downspout from a ladder in under an hour with a hose, a trowel, and a drain auger.
This guide is written by The Roofing Brief Team. Last reviewed: August 2026. Numbers below are reported ranges and vary by region, home height, and how badly the pipe is packed.
How do you know a gutter downspout is clogged?
A clogged downspout shows itself when water pours over the gutter edge during rain but the trough itself looks clean. The blockage is inside the vertical pipe. The fastest confirmation is to run a hose into the gutter near the downspout opening and watch whether water exits the bottom at full flow or trickles, backs up, or leaks from the seams.
- Overflow at one spot: water sheets over the gutter directly above a downspout during rain.
- Weak or no bottom flow: the outlet at ground level dribbles or stays dry after you pour water in the top.
- Bulging or rattling pipe: a packed section can bow outward, and a dry clog rattles when tapped.
- Standing water and stains: pooling at the foundation or vertical streaks down the pipe.
- Ice in winter: a trapped plug freezes and splits seams at the elbows.
To locate the clog, tap your knuckles down the pipe from top to bottom. A hollow, ringing sound means the pipe is clear at that point; a dull, solid thud marks where the debris is packed. Most clogs sit at the top elbow where the pipe turns down from the gutter, or at the bottom elbow just above the ground.
Tools for cleaning gutter downspouts
You can clear most downspouts with hand tools and a garden hose. A drain auger and a wet/dry vacuum handle the stubborn clogs that a hose alone will not move. Match the tool to where the clog sits and how tightly it is packed, rather than reaching for a pressure washer first.
| Tool | What it does | Best for |
|---|---|---|
| Garden hose | Flushes loose debris downward with water pressure | Soft, partial clogs; the first thing to try |
| Gutter scoop or trowel | Pulls debris from the top opening and bottom outlet by hand | Debris you can reach at either end |
| Drain auger or plumber’s snake | Feeds a flexible rod down the pipe to break and hook the clog | Packed clogs the hose cannot clear |
| Wet/dry vacuum | Sucks a clog up from the bottom outlet | Wet, heavy sludge near the base |
| Leaf blower | Blows a dry clog down and out the bottom | Dry leaf packs, before any water is added |
| Ladder with stabilizer and gloves | Safe access to the top opening | Every downspout above reach |
A drain auger, sometimes sold as a gutter snake, is the single tool that clears the most downspouts. See our guide on how to snake a downspout for choosing and feeding an auger. A pressure washer works but carries real risk of denting thin aluminum and blowing apart seams, covered in our note on power washing gutters and downspouts.
How to clean gutter downspouts step by step
Clean a downspout from the top down: clear the opening, flush with water, then attack any remaining clog from the end nearest the blockage. Work with a second person spotting the ladder, wear gloves and eye protection, and never lean past the ladder rails. The steps below move from the easiest fix to the most involved.
- Set up safe access. Place the ladder on firm, level ground with a stabilizer resting against the fascia or roof, not the gutter. Have a helper hold the base. Keep your hips between the rails at all times.
- Clear the top opening. At the point where the gutter feeds into the downspout, remove leaves and grit by hand or with a gutter scoop. Clearing this opening alone fixes many overflow problems because most debris jams at the top elbow.
- Run the tap test. Knock down the pipe from top to bottom and mark the dull, solid section. That is where the clog sits and where you will focus.
- Flush from the top. Feed a garden hose into the top opening and have your helper turn the water on full. If the water runs freely out the bottom, the pipe is clear and you are done.
- Clear the bottom outlet. If water backs up, move to the base. Remove debris from the bottom opening with the scoop, or pull the sludge out with a wet/dry vacuum set to the outlet.
- Disassemble the bottom elbow if needed. Many clogs pack into the curved elbow at ground level. Loosen the screws or rivets, pull the elbow off, knock the plug out, and rinse the section before reattaching it.
- Auger a packed clog. For a clog stuck mid-pipe, feed a drain auger in from the end closest to the blockage per the tap test. Push and twist gently to break it up, then flush again from the top.
- Confirm full flow and check the drainage. Run the hose one more time and watch the bottom. Water should exit at full volume and drain away from the foundation, not pool against it.
Match the method to where the clog sits
The right method depends on where the blockage is and whether it is a dry leaf pack or wet sludge. Use the tap test to place the clog, then pick the approach below. Starting with the gentlest method that fits protects thin aluminum and avoids pushing a clog deeper into the run.
| Clog location | Type | Best method |
|---|---|---|
| Top opening / top elbow | Loose leaves | Hand or scoop from the top, then flush |
| Mid-pipe, straight run | Dry leaf pack | Leaf blower down the top, or auger from the top |
| Mid-pipe, straight run | Wet, packed | Drain auger from the nearest end, then flush |
| Bottom elbow / outlet | Sludge or grit | Disassemble the elbow, or wet/dry vacuum from below |
| Below ground, into a buried drain | Any | Stop; do not flush. Clear the underground line separately |
Clean the downspouts, not just the gutter trough
Clearing the gutter trough and cleaning the downspout are two different jobs, and doing only the trough leaves the vertical pipe blocked. Scooping leaves out of the horizontal channel makes the top look clean while water still backs up, because the clog is inside the pipe below the outlet. Always finish a gutter cleaning by running water through each downspout and confirming it exits the bottom.
The trough collects debris across its whole length and is cleaned by scooping and flushing along the channel. The downspout hides its clog in one spot, usually an elbow, and is cleared by locating that spot and working the pipe. If your overflow returns days after cleaning the trough, the downspout is the part still holding the blockage.
When a downspout ties into an underground drain
If the downspout connects to a buried pipe rather than an open splash block, do not blast a hose or auger blindly into it. Forcing water down can push the clog into the underground line, where it is far harder to reach. Confirm where the water is meant to go before you flush, and treat the buried section as a separate repair.
Where the outlet feeds a splash block or extension, the water should carry several feet from the foundation, covered in our guide on where downspout water should go. Where it feeds a buried pipe, see how to clear a clogged underground gutter drain, which uses a different tool and access point than the vertical pipe.
How often should you clean gutter downspouts?
Clean gutter downspouts at least twice a year, in spring and fall, as part of full gutter maintenance, per guidance from providers including Roto-Rooter. Homes with overhanging trees, especially pines and oaks, often need three cleanings a year or a check before each rainy season. Skipping cleanings lets a partial clog harden into a full one that overflows and can rot the fascia behind the gutter.
Hiring a pro to clear downspouts usually adds a modest amount to a gutter cleaning rather than being priced per foot. Reported figures from cost aggregators such as Angi and HomeGuide put the downspout add-on around 50 to 110 dollars per visit, depending on home height and the number of drops. A recurring overflow that returns within weeks of cleaning often points to a buried-drain clog or a sagging gutter, not the pipe itself, discussed in our guide to why gutters overflow.
How to keep downspouts from clogging
The best way to reduce downspout cleaning is to stop debris from reaching the pipe. Gutter guards over the trough catch most leaves before they wash toward the outlet, and downspout strainers at the top opening block the rest. Neither removes the need to clean, but both stretch the interval and cut how packed a clog gets.
- Install gutter guards over the trough to keep leaves out of the water path.
- Add a downspout strainer or wire ball at each top opening to catch what slips past.
- Trim overhanging branches so less falls directly into the gutter.
- Confirm the slope, roughly a quarter inch of fall per 10 feet of gutter, so water carries debris to the downspout instead of sitting.
- Check the outlet drainage so water leaves the base and does not back grit up into the pipe.
Frequently asked questions
How do I unclog a gutter downspout?
Start by clearing debris from the top opening by hand, then run a hose in at full pressure. If water backs up, tap down the pipe to find the clog, then work it from the nearest end with a drain auger or by removing the bottom elbow. Flush again from the top to confirm the pipe runs clear and water exits the bottom.
How often should you clean gutter downspouts?
Clean downspouts at least twice a year, in spring and fall, alongside the gutters. Homes surrounded by trees often need three cleanings a year or a check before each heavy rain season. Regular clearing keeps a small partial clog from hardening into a full blockage that overflows and can damage the fascia and foundation.
Can I use a pressure washer to clean a downspout?
You can, but with caution. A pressure washer clears packed clogs fast, yet the same force can dent thin aluminum, split soldered or sealed seams, and spray debris back at you. Try a garden hose and a drain auger first. If you use a pressure washer, keep the pressure moderate and work from the top down.
Why is my downspout clogged but the gutter looks clean?
Because the clog is inside the vertical pipe, not the trough. Debris washes along the clean-looking channel and jams at the top or bottom elbow of the downspout, where you cannot see it. Water then backs up and overflows above that drop even though the horizontal gutter is clear. Clear the pipe, not just the trough.
How much does it cost to have downspouts professionally cleaned?
Downspout cleaning is usually a small add-on to a gutter cleaning rather than a separate per-foot charge. Reported ranges from cost aggregators put it around 50 to 110 dollars per visit, depending on the home’s height, the number of downspouts, and how packed they are. A buried underground drain clog costs more because it needs different tools and access.
Can you put a plumbing snake down a downspout?
Yes. A plumber’s snake or drain auger is one of the most effective tools for a downspout clog the hose will not move. Feed it in from the end closest to the blockage, then push and twist gently to break the clog apart before flushing with water. Go slowly on aluminum pipe so the auger tip does not punch through a seam.