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How to Keep Extension Cords Dry Outside: Covers for Every Plug

Rain gets in where two plugs meet, not along the cord. Lift the connection, add a drip loop, then seal it in a weatherproof cover.

By Jamilur Rahman Updated November 5, 2026 · 7 min read

Time
10 min
Cost
Under $20
Difficulty
Easy
Two extension cord plugs joined together on a wet lawn with raindrops on the plastic
In this guide
  1. Quick answer
  2. Free vs. permanent fix
  3. What you'll need
  4. Why it happens
  5. Try this first (free)
  6. When free fixes aren't enough
  7. Buy the fix
  8. What the letters on the cord mean
  9. When to stop and call an electrician
  10. What to skip
  11. FAQ
  12. Related problems

Quick answer

Water gets into an outdoor extension cord at the connection, where one plug meets the next, not along the cord itself. Use a cord rated for outdoor use, plug into a GFCI outlet, lift the connection off the wet ground and give the cord a drip loop. Then seal the plugs in a weatherproof connection cover so rain and sprinklers cannot reach the metal. That also answers the safety question: an outdoor cord is fine for temporary jobs as long as the connection stays dry.

Free fix vs. permanent fix

Free fix · 10 minutes

Raise it, loop it, shelter it

  • Use only a cord marked for outdoor use, with a W in the letter code
  • Plug into a GFCI-protected outlet
  • Set the connection on a brick or an upturned plastic crate
  • Hang the cord in a low loop so water drips off before the plug

How long it lasts: One dry spell. A raised connection with a drip loop handles light rain, but wind-driven rain, sprinklers and wet grass can still reach the plugs.

Most readers choose Permanent fix
Weatherproof extension cord connection cover (illustration)
Illustration

A weatherproof cord connection cover

A cover closes around the two plugs where they meet, with a sealed opening for each cord. Rain and spray cannot reach the metal prongs, which is what shorts the circuit and trips the GFCI. It handles rain, not standing water, so keep the connection raised as well.

What to get: Weatherproof extension cord connection cover

How long it lasts: Years. It stays on through every rain until the plastic cracks.

Check price on Amazon

As an Amazon Associate I earn from qualifying purchases.

What you'll need

  • Outdoor-rated extension cord

    Check the jacket print for a W, as in SJTW

    You have it

  • Brick, paver or plastic crate

    Lifts the connection out of puddles

    Free
  • Our pick
    Weatherproof cord connection cover (illustration)
    Illustration

    Weatherproof cord connection cover

    Encloses the plug-to-plug connection

    Check price
  • Portable outdoor GFCI adapter (illustration)
    Illustration

    Portable outdoor GFCI adapter

    Only if your outdoor outlet has no test and reset buttons

    Check price
  • In-use outdoor outlet cover (illustration)
    Illustration

    In-use outdoor outlet cover

    For a wall outlet you plug into again and again

    Check price

Why it happens

1

Water at the plug connection

The weak spot is the gap where two plugs meet. Rain runs down the cord into it, and sprinkler spray blows in sideways. Water on live metal can short the circuit and trip the GFCI.

2

An indoor-only cord outside

Indoor cords have jackets that crack in sun and cold and let water in. If the label does not carry a W, it does not belong outdoors, even for a weekend.

3

Connections lying on wet ground

A plug sitting in a puddle or soaked grass is in the worst spot. Even an outdoor-rated plug is not made to sit in water.

4

No drip loop

A cord that runs straight down into a plug funnels rain right to the connection. A low loop gives the water somewhere to drip off first.

5

Leaving the cord out for weeks

Extension cords are built for temporary use. Weeks of sun, rain and foot traffic wear the jacket and the plug faces. For long-term power outside, an installed outdoor outlet is the right answer.

Try this first (free)

Do these in order, starting with the simplest.

  1. Read the cord label

    Tool used: Outdoor-rated extension cord

    Look at the print on the jacket. A W in the letter code, such as SJTW, means it is rated for outdoor use. If it says indoor use only, take it inside and swap it for an outdoor cord.

  2. Plug into a GFCI outlet

    Tool used: Portable outdoor GFCI adapter

    Outdoor outlets should be GFCI protected. Press the test button, which should click the outlet off, then press reset. No buttons? Use a portable GFCI adapter between the cord and the outlet.

    Portable outdoor GFCI adapter (illustration)
    Illustration

    Tool for this step

    Portable outdoor GFCI adapter · Only if your outdoor outlet has no test and reset buttons

    Check price on Amazon

  3. Lift the connection off the ground

    Tool used: Brick, paver or plastic crate

    Set the joined plugs on a brick, paver or upturned crate, away from puddles, sprinkler heads and the spot under a downspout.

  4. Hang a drip loop

    Let the cord dip in a low U just before the connection so water drips off the bottom of the loop. Keep the plugs pointing sideways or down, never up into the rain.

  5. Seal the connection in a cover

    Tool used: Weatherproof cord connection cover

    Push the plugs fully together, set them in the cover and close it with the cords running out through the openings. Check that the lid latches all the way.

    Weatherproof cord connection cover (illustration)
    Illustration

    Tool for this step

    Weatherproof cord connection cover · Encloses the plug-to-plug connection

    Check price on Amazon

When free fixes aren't enough

Raising and looping the cord handles light rain, but not sideways rain, sprinklers, dew or a lawn that stays wet. If the cord stays out for a day or more, for holiday lights, a pond pump or a hedge trimmer, the connection needs a cover that closes around it. If the GFCI keeps tripping, a plug feels warm or looks discolored, or the jacket is cracked, unplug it and replace the cord. If you need power outside every week, an electrician can install a weatherproof outlet. An extension cord is a temporary tool.

Buy the fix

Still stuck after the free fixes? These are the products we would look at.

Our picks compared
PickProductFixesWho it's forBuy
Best pick
Weatherproof extension cord connection cover (illustration)
Illustration
Weatherproof extension cord connection cover
rain and spray getting into the plug connection Anyone running a cord outdoors for more than a quick job, such as holiday lights, a pump, power tools or a party. Check price
Upgrade pick
In-use weatherproof outdoor outlet cover (illustration)
Illustration
In-use weatherproof outdoor outlet cover
rain reaching the wall outlet end of the cord Anyone who plugs in at the same outdoor outlet again and again, for lights, a pump or a fountain. Check price
Best pick
Weatherproof extension cord connection cover (illustration)
Illustration

Weatherproof extension cord connection cover

Fixes: rain and spray getting into the plug connection

Look for: Closes around the full plug-to-plug connection with a snug fit; Rubber or gasket seals where the cords leave the cover; Fits your plug size, including thicker 12 or 14 gauge cords; UV-resistant plastic that will not crack in sun and cold.

Who it's for
Anyone running a cord outdoors for more than a quick job, such as holiday lights, a pump, power tools or a party.
Honest downside
The connection will sit where water pools or under a downspout. Covers resist rain and spray, not standing water.
Check price on Amazon
Upgrade pick
In-use weatherproof outdoor outlet cover (illustration)
Illustration

In-use weatherproof outdoor outlet cover

Fixes: rain reaching the wall outlet end of the cord

Look for: A deep hinged cover that closes over the plugged-in cord; Fits your outlet: single or double, vertical or horizontal; A gasket that seals against the wall; UV-resistant housing.

Who it's for
Anyone who plugs in at the same outdoor outlet again and again, for lights, a pump or a fountain.
Honest downside
You are not comfortable working at an outlet. Turn off the breaker first, or have an electrician swap it. Skip it if the outlet is not GFCI protected; fix that first.
Check price on Amazon

As an Amazon Associate I earn from qualifying purchases. We don't show prices because they change, so use the button to see today's price.

How we picked: How we picked: this page is based on extension cord and outdoor electrical safety guidance, cord labeling standards, product instructions for cord covers, and what owners report in reviews. We do not test products by hand.

What the letters on the cord mean

The print on the jacket tells you what the cord can take. A W in the letter code, such as SJTW, means weather-resistant and rated for outdoor use. Codes without a W, such as SJT, are for indoor use. Jacket color is no guide, so read the print.

When to stop and call an electrician

Stop using the cord if a plug is hot, melted or scorched, if the jacket is cracked or cut, or if the GFCI trips again right after you reset it. If you find water in an outlet box, or the outlet itself looks burned, turn off the breaker and call a licensed electrician. Do not use that outlet until it has been checked.

What to skip

Electrical tape and plastic bags

Tape wrapped around plugs and sandwich bags over the connection trap moisture against the metal. Water gets in at the gaps and cannot dry out. Neither makes the connection safe. A cover built for the job beats both.

Frequently asked questions

Is it safe to have extension cords outside?
Yes, for temporary jobs, if the cord is rated for outdoor use, the outlet is GFCI protected, the cord is thick enough for the load and the plug connections stay dry. It is not safe to leave an indoor cord outside, run a cord through standing water or leave one out all year.
Can I leave an extension cord outside overnight?
You can if everything is outdoor-rated, raised and covered, and no heavy rain is forecast. For anything longer than a few days, have an outdoor outlet installed.
What do I do if a plug gets wet?
Do not touch it. Turn the power off at the breaker first, then unplug it and dry both plugs fully. If you see dark marks or the GFCI keeps tripping, replace the cord.
Does a cover make an indoor cord safe outside?
No. The cover protects the connection, not the cord. An indoor cord's jacket can crack in sun and cold, so it still needs to be an outdoor-rated cord.
What cord thickness do I need?
Thinner cords, which have a higher gauge number, run hot under heavy loads. For power tools or a heater, use a 12 or 14 gauge cord and keep it as short as you can. Check the amp rating on the label against your device.

As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure

Weatherproof extension cord connection cover (illustration)
Illustration

Our pick: Weatherproof extension cord connection cover

Check price