Can Outdoor Christmas Lights Get Wet?

If you live somewhere with wet winters, you've probably wondered whether your outdoor Christmas lights are actually safe in the rain. After all, water and electricity are a bad mix, right?

There's a little more to explain, so let's dive deeper into:

• Whether Christmas lights are safe to use in the rain
• Whether it's OK for plugs to get wet
• How to protect Christmas lights from the weather

Are Outdoor Christmas Lights Safe In The Rain?

Christmas light strings sold in the U.S. are tested under UL 588, the safety standard for seasonal decorative lighting. There are two relevant categories: indoor-only strings, which carry a green holographic UL label, and indoor/outdoor strings, which carry a red holographic UL label. The red label means the lights are approved for both indoor and outdoor use — there isn't a separate "outdoor-only" category. Lights certified by ETL (Intertek) under the same standard are equally valid.

So when people talk about outdoor lights being used indoors, they're really talking about red-labeled strings. They'll work fine inside; they're just often brighter and run hotter than you typically want indoors — especially incandescent strings.

The difference between indoor-only and outdoor-rated strings comes down to waterproofing. Outdoor lights have bulbs and wires sealed against the elements, and that level of sealing is described by the IP rating.

Understanding the IP rating

IP (Ingress Protection) is the rating that tells you how sealed an electrical item is against solid particles and liquid. You'll usually find it printed on the packaging or in the product listing online.

The rating is made up of two numbers — the first is the protection against solid particles like dust (ranging 0–6), and the second is liquids (ranging 0–8, with a separate IPX9K test on top).

You may also see an "X" in place of one of the digits (e.g., IPX4) — that just means the product hasn't been tested for that category, not that it failed.

Here's what each level of water protection means:

One important caveat: the water-ingress ratings are not cumulative beyond IPX6. A product rated IPX7 (immersion) isn't necessarily protected against high-pressure jets, and IPX9K isn't simply "better than" IPX8 — it's a separate industrial test for 80–100 bar, ~80°C jet washdown. For Christmas lights, this rarely matters; just don't assume a higher number always covers every lower one.

What rating do you actually need?

For Christmas lights hung outdoors, an IP rating ending in 4 (typically IP44) is enough — it's protected against splashing water from any direction. Many strings are rated IP65 or IP67, which adds protection against water jets or temporary immersion, useful if you're running lights along the ground or somewhere they might sit in a puddle.

As long as you buy Christmas lights that are rated IP44 or better and carry a red UL or ETL holographic label, they'll be safe in the rain and snow.

LED vs. incandescent in wet weather

Both LED and incandescent strings are sold with outdoor ratings, but LEDs have a real safety edge outdoors. They run much cooler, draw a fraction of the power, and use low-voltage drivers in many cases. Incandescent bulbs get hot, and a hot glass bulb hit by cold rain can occasionally crack — which is exactly the kind of breach that lets water reach the filament. If you're starting fresh, LEDs are the better choice for wet conditions.

Can Christmas Light Plugs Get Wet?

If the lights themselves are waterproof, does that mean the plug is too? Not necessarily. The plug and any connection points are still vulnerable, and an exposed plug sitting in a puddle is the most likely cause of a short, a tripped breaker, or — worst case — a fire.

Follow these steps to keep connections safe:

1. Choose your plug location. Plugging into an indoor outlet and running the cord through a door or window is the simplest option. If you need to plug outdoors, use an outdoor-rated GFCI outlet.
2. If outdoors, install a weatherproof cover. A weatherproof in-use cover (sometimes called a "bubble cover") seals around the plugged-in cord so the outlet stays protected even while in use. Install it on a dry day.
3. Use outdoor-rated extension cords. If you need to extend the reach, use a cord specifically rated for outdoor use (look for an "SJTW" or "SJEOW" jacket marking). Indoor cords have thinner insulation that isn't designed for wet conditions.
4. Protect cord-to-cord connections. The point where a light string plugs into an extension cord is another weak spot. Extension cord safety covers seal that junction to IP44.
5. Keep connections off the ground. Drape cables over bushes, hooks, or railings rather than leaving them in grass where water can pool. Even outdoor-rated gear lasts longer when it isn't sitting in a puddle.

How To Protect Christmas Lights From Rain

If you've bought outdoor-rated waterproof lights, there isn't much else you need to do day to day. A few practical habits help, especially when the weather turns nasty.

Inflatables and standalone decorations

If you have inflatable Santas, wicker reindeer, or other standalone decorations, bring them indoors ahead of a serious storm — or cover them with a tarp. Either way, power them off first; trapping a powered fan or transformer under a tarp is a worse outcome than a soaked decoration.

Should you turn lights off during a storm?

Outdoor-rated lights on a GFCI-protected circuit are designed to handle steady rain, snow, and freezing temperatures. But in my experience, it's worth switching them off during severe weather — heavy windstorms can pull strings down or tear connectors apart, and once the seal on a connector is compromised, the IP rating no longer applies. If a string gets damaged or partially submerged in standing water, unplug it and let it fully dry out before powering it back on.

Always use a GFCI outlet

The single most important electrical safety device for Christmas lights is a Ground Fault Circuit Interrupter (GFCI) — the outlet (or breaker) with the test and reset buttons on it.

All outdoor outlets at dwellings must have GFCI protection under the National Electrical Code. Many indoor outlets are required to as well — under NEC 210.8(A), GFCI protection is required in bathrooms, kitchens, garages, basements, laundry areas, crawl spaces, and within 6 feet of any sink. If you're plugging your Christmas lights into an indoor outlet in one of those rooms, it should already be GFCI-protected.

A GFCI detects when current is leaking out of the circuit — for example, through water or a damaged wire — and cuts power within milliseconds. That's different from a surge protector (which guards against voltage spikes) or a regular breaker (which trips on overload). The GFCI is what protects you from shock when water and electricity meet.

Test the GFCI monthly using the built-in test and reset buttons — UL and the NEC both recommend this. Press "Test" with something plugged in; the device should cut power. Press "Reset" to restore it. If the test button doesn't trip the outlet, replace it. GFCIs do wear out, and a non-functioning one looks identical to a working one.

The Bottom Line

If you only do one thing, make sure your outdoor Christmas lights are IP44-rated or better and carry a red UL or ETL holographic label.

If you do two things, also plug them into a GFCI-protected outlet — and test that GFCI before the season starts.

If you do three, protect every connection: a weatherproof in-use cover on the outdoor outlet, an outdoor-rated extension cord, and all junctions kept up off the ground. Do those three things and your lights will be safe through almost any winter weather you'll see.

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