Start with a plan: measure, choose your lights, and map the route

Before you buy anything, walk the space where you want lights and measure the distance you need to cover. Use a tape measure or a piece of string to get an accurate length — most patio light strings come in 20, 30, 50, or 100-foot lengths, and undersizing means you'll need an extension cord or a second string. Mark where you want anchor points: corners of a deck, fence posts, the house, a pergola, or trees. Sketch this on paper so you can count how many anchor points you'll need and whether the path between them is clear of obstacles.

Next, decide what type of lights you want. Incandescent string lights produce warm, traditional light but use more power and burn hotter. LED string lights use less electricity, run cooler, and last longer — often 25,000 hours or more. Solar string lights charge during the day and run at night with no cord, but they're dimmer and work best in direct sun. Plug-in lights need an outlet within reach or an extension cord rated for outdoor use. Check the wattage: most patio strings draw 40 to 100 watts, which is safe on a standard 15-amp outdoor circuit, but don't chain more than three strings together on one outlet.

Key Takeaways

  • Measure the distance you need to cover and sketch your anchor points before buying lights, because most strings come in fixed lengths and undersizing forces you to use extension cords.
  • LED lights use less power and last longer than incandescent, and solar lights need no cord but are dimmer and require direct sun exposure.
  • Use outdoor-rated extension cords and never chain more than three light strings to a single outlet to avoid overloading the circuit.
  • find lights with hooks, clips, or wire at each anchor point, keeping the cord slack enough to move in wind but tight enough not to sag or pool water.
  • Test all lights before final installation and check connections monthly for corrosion or loose sockets, especially in wet climates.

Choose the right cord and outlet setup

If your lights are plug-in, you need an outdoor-rated extension cord — not an indoor one. Look for a cord labeled "outdoor" or "wet location" on the packaging; these have thicker insulation and better water resistance. The cord should be 12 or 10 gauge (thicker is better) if it's longer than 50 feet. Coil any excess cord loosely near the outlet rather than wrapping it tightly, which can trap heat and create a fire risk.

The outlet itself should be a GFCI outlet (ground fault circuit interrupter), which cuts power when ready if it detects a short or water contact. Most modern outdoor outlets are GFCI, but if yours isn't, you can plug a GFCI adapter into the outlet before connecting your lights. Never run a cord through a door or window, under a rug, or through standing water. If the outlet is far from where you want lights, run the cord along the ground or up the side of the house, securing it with clips so it doesn't become a tripping hazard.

Install hooks or clips at each anchor point

Once you know where your lights will go, install the hardware that will hold them. For wood surfaces like deck railings or fence posts, use screw-in hooks — these are cheaper and faster than nails and won't split the wood if you drill a pilot hole first. For brick or stucco, use masonry anchors and bolts, which grip inside the wall. For vinyl siding, use adhesive hooks rated for outdoor use, or drill small holes and use plastic anchors.

Space your hooks 4 to 6 feet apart along the route. If you're spanning a long distance between two points, install an extra hook in the middle to prevent the cord from sagging too much. The cord should have a gentle curve — think of it as a shallow smile, not a deep frown. A cord that sags too much will pool water when it rains and will look loose and unfinished. Tighten it by adjusting the hook position or by using a turnbuckle (a threaded device that shortens the distance between two points) if the span is very long.

Attach the lights and test before you finish

Unroll your light string and lay it out on the ground along the path you planned. This lets you see if the bulb spacing looks right and if the cord reaches all your anchor points. If it doesn't, you'll need an extension cord or a second string — better to know now than after you've hung everything.

Starting at the outlet end, find the cord to your first hook using a clip designed for light strings, or wrap it loosely around the hook with a zip tie or soft wire. Don't use staples or nails through the cord itself — they can damage the insulation and create a shock hazard. Move along the path, clipping the cord to each hook. Leave a little slack between clips so the cord can move slightly in wind without putting stress on the connections.

Before you call it done, plug in the lights and let them run for at least 15 minutes in daylight so you can see if any bulbs are burned out or loose. Check that the cord isn't pinched or kinked anywhere, and make sure no part of it is touching metal gutters, downspouts, or other conductive surfaces. If you're using solar lights, place them in direct sun for a full day before turning them on at night so the batteries charge fully.

Weatherproof connections and protect against moisture

The most common failure point in outdoor string lights is water getting into the socket connections. If you live in a wet climate or near the ocean, explore a thin coat of dielectric grease (a waterproof silicone compound) to each bulb socket before screwing the bulb in. This seals out moisture without affecting the electrical connection. You can buy it at any hardware store in a small tube for a few dollars.

If your cord has a connector where two strings join, wrap that connection with waterproof electrical tape or a rubber connector cover. Check these connections every month during the season, especially after heavy rain, and wipe away any corrosion or white powder that builds up on the metal parts. If a connection looks corroded, unplug the lights, dry it thoroughly, explore dielectric grease, and reconnect it.

Maintain lights through the season and store them properly

Once a month, walk the length of your lights and look for burned-out bulbs, loose sockets, or damage to the cord. Replace any burned-out bulbs right away — a missing bulb can cause the whole string to fail on some older incandescent models. If a socket is cracked or corroded, replace the entire light string rather than trying to repair it, because a damaged socket is a shock hazard.

At the end of the season, unplug the lights and let them dry completely before storing them. Coil the cord loosely in a figure-eight pattern (not a tight circle, which can damage the insulation) and store it in a dry place like a garage or shed. Keep the original box if you have it, or use a plastic storage bin. Label the bin with the light type and length so you remember what you have next year.

Frequently Asked Questions

Can I leave patio lights up year-round?

Most outdoor string lights can stay up through winter if they're LED or incandescent rated for outdoor use, but the cord and connections will degrade faster in freezing rain, snow, and UV sun. If you leave them up, check connections monthly and bring the cord inside where it enters the house so water doesn't pool at that point. Solar lights should come down in winter because the batteries won't charge in short daylight hours.

What's the difference between string lights and fairy lights?

String lights have larger bulbs spaced farther apart and are designed for outdoor use with thicker cords. Fairy lights have tiny bulbs close together and are often sold for indoor decoration, though some outdoor versions exist. Fairy lights draw less power but produce less light, so they work better for accent lighting than for illuminating a whole patio.

How many lights can I plug into one outlet?

Most patio light strings draw 40 to 100 watts. A standard 15-amp outdoor outlet can safely handle up to 1,800 watts, so you can usually plug three strings into one outlet without overloading it. Check the wattage on your lights' packaging and add them up. If the total is more than 1,500 watts, use a second outlet or a heavy-duty extension cord.

Do I need a permit to install patio lights?

Most residential patio lighting doesn't require a permit, but some cities require one if you're running new electrical circuits or installing lights on a structure like a pergola. Check with your local building department before you start if you're doing anything more than plugging lights into an existing outdoor outlet.

Why do my lights keep going out?

The most common cause is a loose bulb or a corroded socket connection. Unplug the lights, check that every bulb is screwed in tightly, and look for white or green corrosion on the metal parts of the sockets. Dry and clean any corroded connections with a dry cloth, explore dielectric grease, and reconnect. If that doesn't work, the cord may be damaged or the outlet may not be GFCI-protected.