How do I keep string lights from sagging too much?

Run a steel guide wire (aircraft cable) between your anchor points first, pull it taut with a turnbuckle, and zip-tie the string lights to that wire; the cable carries the load so the lights stay level instead of drooping. A little intentional droop, called catenary, looks good over a patio, but heavy sag comes from hanging bulb strings alone across a long span, since the wire in the light string is not made to bear tension. For spans over about 12 to 15 feet, the guide wire is essential.

How far apart should I space the hooks or anchors?

Space anchor points 6 to 10 feet apart for bulb strings hung directly, and up to the full guide-wire span (20 feet or more) when a steel cable carries the load. Closer spacing means less sag and a more controlled look; wider spacing needs a guide wire. Plan the layout so each run ends at a solid anchor: a house wall, a post, a tree, or a dedicated 4x4 post set in a bucket of concrete or a planter if you have no natural anchor point. Sketch the runs before drilling.

What kind of outlet should outdoor string lights plug into?

Plug outdoor lights into a GFCI-protected outdoor outlet, which cuts power instantly if it detects a fault, protecting against shock in wet conditions. If your outdoor outlet is not GFCI, use a portable GFCI adapter or have an electrician add GFCI protection. Use only lights and extension cords rated for outdoor use, keep connections up off the ground and out of standing water, and consider a smart plug or timer so the lights run on a schedule. Never run indoor cords or lights outside.

Can I hang string lights without drilling holes?

Yes. Use screw-in cup hooks only where drilling is fine; elsewhere reach for adhesive outdoor hooks on smooth surfaces, gutter hooks that clip over the gutter lip, or freestanding poles anchored in planters or buckets of concrete for a no-drill span across open patio. For brick or stucco, brick clips or masonry hooks avoid drilling. Guide-wire runs still need a solid anchor at each end, but between them the lights clip to the cable, so the only fixings are at the two endpoints.

How many string lights can I connect end to end?

Check the maximum connected length printed on the box or in the manual, since every string has a limit before you overload the wiring, and LED strings allow far longer runs than incandescent because they draw much less power. Commercial-grade LED strings often allow many hundreds of feet connected; incandescent strings may cap at a few connected sets. Exceeding the limit can overheat the wire and is a fire risk. If you need more length than one run allows, start a second run from a separate outlet rather than chaining past the limit.

How to Hang Outdoor String Lights (DIY, Step by Step)

Written & researched by Derek Holt Home & Appliances Editor

Updated August 2026

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Hanging outdoor string lights is an easy afternoon project needing basic tools and no electrical work beyond plugging into a GFCI outlet. Cost is $30 to $150 for lights, hooks and a guide wire. The difference between a sagging mess and a crisp, level canopy is a taut steel guide wire on longer spans. Use outdoor-rated lights and cords, plug into GFCI-protected outlets, and you have a safe, professional-looking result. No permit and no pro unless you need a new outdoor outlet installed.

How to Hang Outdoor String Lights — The Home Depot

Plan the layout first

Sketch your patio and decide the pattern: straight runs, a zigzag, or crisscross for a canopy. Mark anchor points at a house wall, posts, trees, or planned 4x4 posts. Measure each span, add slack, and total the length against the lights' maximum connected run. Decide now where the nearest GFCI outdoor outlet is so a run ends near power.

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Step-by-step installation

Set the anchor points. Install a solid anchor at each run's end: a screw hook into a stud or post, a masonry hook on brick, or a freestanding post in a concrete-filled bucket or planter where there is no structure.
Run the guide wire (for long spans). String aircraft cable between anchors, loop it through the hooks, and tension it with a turnbuckle until it is taut with only a slight sag.
Test the lights on the ground. Plug the full connected run in and confirm every bulb works before you hang it, so you are not troubleshooting overhead.
Attach the lights. Zip-tie or clip the string to the taut guide wire every couple of feet, or hang bulb strings directly on closely spaced hooks for short spans.
Set the droop. Let each span sag a consistent, gentle amount (a foot or so of droop over a 15-foot span looks intentional). Match the droop across runs for a clean look.
Route the cord to power. Run the plug end to a GFCI outdoor outlet using an outdoor-rated extension cord if needed. Keep connections up off the ground.
Secure and weatherproof. Tuck excess cord neatly, keep plug connections sheltered or wrapped, and confirm nothing dangles where it can be walked into.
Add a timer or smart plug. Put the lights on a schedule so they come on at dusk without a switch.

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Tools and materials

You need outdoor-rated string lights, aircraft cable with turnbuckles and eye hooks for long spans, screw or masonry hooks, zip ties, a drill, and an outdoor extension cord. A smart plug or timer automates the on/off. String lights are the finishing touch on an outdoor space — hang them over a pergola or across a paver patio, warm the scene beside a fire pit, and pair them with comfortable patio furniture to make the space usable after dark.

Over-the-shoulder view of a person grilling vegetables, in soft early-morning light

Mistakes that cause sag and shorts

No guide wire on long spans. Bulb strings alone droop badly and strain the wiring. Use a taut steel cable to carry the load.
Weak anchors. A hook pulled from drywall or loose trim drops the whole run. Anchor into studs, posts, or masonry.
Non-GFCI outlets or indoor cords. That is a shock and fire risk outdoors. Use GFCI outlets and outdoor-rated cords only.
Exceeding the connected-length limit. Chaining too many strings overheats the wire. Start a new run from another outlet.

Electrical safety

Use only lights and extension cords rated for outdoor use, and plug into GFCI-protected outlets so a fault cuts power instantly. Keep all connections up off wet ground and sheltered from standing water. Respect the maximum connected length to avoid overheating. The only part that requires a licensed electrician is adding a new outdoor outlet or GFCI protection where none exists — hanging the lights themselves is fully DIY.

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How to Hang Outdoor String Lights