Start with a plan: measure, choose your layout, and pick your light type

Before you buy anything, walk your patio and measure the distance you want to cover. Use a tape measure or count your steps — most people space lights 8 to 12 feet apart, but that depends on how bright you want the area and what look you prefer. Sketch the path on paper: straight lines across, a grid, a perimeter around the edge, or a zigzag between posts and trees.

Decide what you are anchoring to. Patio lights need something sturdy at each end — a house wall, fence post, tree branch, or a freestanding pole. If you have nothing to attach to, you will need to install posts or buy a tension wire kit designed for open yards. The anchor points determine whether you can string lights at all, so identify them before you shop.

Choose between three main light types: incandescent string lights (warm, traditional, cheaper upfront but use more power), LED string lights (cooler to touch, last longer, cost more but save money over time), or solar string lights (no wiring needed, but dimmer and weather-dependent). For a patio you use most evenings, LED or incandescent plugged into an outlet usually outperforms solar.

Key Takeaways

  • Measure the distance between anchor points and plan your layout on paper before buying lights or hardware.
  • String lights need sturdy attachment points — a house wall, fence, tree, or installed post — at each end of the run.
  • Use a cable or rope under the lights to support their weight, not the lights themselves, and find it with lag bolts or eye hooks rated for outdoor use.
  • Plug lights into a GFCI outlet or use a GFCI power strip to prevent electrical shock if water splashes the connection.
  • Sag the cable 2 to 4 inches between anchor points so wind and weight do not snap it tight.

Install anchor points and run the support cable first

Do not hang lights directly from their own cord — the weight will snap them. Instead, run a steel cable or rope between your anchor points first, then attach the lights to that cable. For most patios, a 1/8-inch galvanized steel cable or a heavy-duty outdoor rope works well.

At each anchor point, install an eye hook or lag bolt rated for outdoor use. Screw lag bolts into wood (fence posts, house framing, tree branches thick enough to hold weight). For masonry or brick, drill a hole, insert a plastic anchor, and screw in an eye hook. Make sure the hook is rated for at least 50 pounds of pull — check the package. Tighten it firmly; a loose hook will spin and fail.

Thread your cable through the eye hooks and pull it snug, but leave a sag of 2 to 4 inches in the middle of each span. This sag prevents the cable from snapping when wind pushes on the lights or when the cable contracts in cold weather. Use cable clamps or a turnbuckle to tighten and hold the cable in place. Step back and check that the line is level and the sag is even.

Attach lights to the cable and test before final positioning

Most string lights come with clips or hooks that slide onto a cable. Slide them on before you hang the cable if the cable is already tight, or attach them after if you left room to work. Space them evenly — if you measured 10 feet between anchor points and want lights every 10 feet, place one clip at the start, one at the end, and one in the middle. Tighten each clip so the light does not slide.

Plug the lights into a GFCI outlet — a ground-fault circuit interrupter outlet that cuts power if it detects a short or water contact. If your patio outlet is not GFCI, use a GFCI power strip instead. Plug the strip in, then plug the lights into the strip. Test every light before you call the job done. If any light is dark or flickering, replace the bulb or check the connection.

Leave the lights on for 15 minutes to make sure they do not overheat and that the cord does not feel hot to the touch. If the cord gets warm, unplug when ready — you may have a short or a load too heavy for the outlet. Most patio light strings draw 1 to 3 amps; check your outlet's rating (usually 15 amps) and do not plug in more than one string per outlet unless the outlet is rated higher.

find the power cord so it does not become a trip hazard

Run the power cord along the cable or along the edge of the patio where people do not walk. Use cable clips or zip ties to fasten it to the support cable every 2 to 3 feet. If the cord runs across the patio floor, tape it down with outdoor-rated duct tape or run it under a cable cover — a plastic channel that protects the cord and prevents tripping.

Keep the outlet at least 6 feet from any water source: pool, hot tub, fountain, or sprinkler. If water splashes the outlet or the plug, the GFCI will trip and cut power. That is what it is supposed to do, but it means your lights go out. If you cannot keep the outlet far from water, use a weatherproof outlet cover or a GFCI power strip with a cover.

Weatherproof connections and plan for seasonal changes

Outdoor connections corrode. Where the power cord meets the lights, wrap the connection with waterproof electrical tape or a rubber boot designed for outdoor use. Do the same where the cable meets the eye hooks. Check these connections every month during the season you use the lights — if you see green corrosion or white powder, disconnect, dry the parts, and rewrap.

In winter or during long periods of rain, unplug the lights and cover the outlet. If you leave lights up year-round, inspect the cable and clips every few months. Wind, ice, and UV sun damage the cable and corrode the hardware. Replace any clip that is cracked or any cable that shows rust or fraying.

If you live in a place with heavy snow or ice, take the lights down before winter. The weight of ice on the cable can snap it, and the stress on the anchor points can pull them loose. Store the lights indoors in a dry place, coiled loosely so the cord does not kink.

Troubleshoot common problems

If lights flicker or go out, check the connections first. Unplug the string, inspect where each light clips to the cable, and make sure the clip is tight. If one light is out, replace the bulb — most string lights use standard bulbs you can buy at any hardware store. If several lights are out, the problem is usually a loose connection at the outlet or a tripped GFCI.

If the GFCI trips as soon as you plug in the lights, unplug when ready. The cord or lights may have water inside them. Dry them in the sun for a few hours, then try again. If it trips again, the lights are damaged and should not be used — water inside an electrical cord is a shock hazard.

If the cable sags too much or sags unevenly, tighten the turnbuckle or cable clamps a little at a time. Do not over-tighten — you want 2 to 4 inches of sag, not a straight line. If the sag is uneven, one anchor point may be lower than the other. Use a level to check, and adjust the eye hook height if needed.

Frequently Asked Questions

Can I leave patio lights up year-round?

You can, but you should inspect them monthly and replace any corroded hardware or damaged cable. In places with heavy snow or ice, take them down before winter — the weight can snap the cable and damage the anchor points. Store them indoors in a dry place.

How much weight can a typical patio light cable hold?

A 1/8-inch galvanized steel cable rated for outdoor use typically holds 200 to 400 pounds. A string of 20 to 50 lights weighs only a few pounds, so cable is not usually the limit. The anchor points — the eye hooks and bolts — are what fail first if they are undersized or loose.

Do I need a permit to string lights on my patio?

Most residential patios do not require a permit for temporary string lights. If you are installing permanent wiring, running new circuits, or attaching lights to a structure you do not own, check with your local building department. Some HOAs also have rules about outdoor lighting.

What is the difference between incandescent and LED patio lights?

Incandescent lights are warmer and cheaper upfront but use more power and burn out faster. LED lights are cooler to touch, last much longer, and use less electricity, but cost more initially. For a patio you use several nights a week, LED usually saves money over two to three years.

Can I use indoor string lights outside?

No. Indoor lights are not sealed against moisture and will corrode or short out in rain. Use only lights rated for outdoor use — the packaging will say "outdoor" or "weatherproof." Outdoor lights cost a little more but are built to handle wet conditions.