The easiest way to put Christmas lights on a timer is to plug them into an outlet timer, a dusk-to-dawn photocell timer or a smart plug, then set the hours once. Your lights turn on at sunset and off at bedtime every day without you remembering a thing.
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No more running out in socks at 11 p.m. because the porch is still glowing. Here’s how each option works, what it costs and which one fits your setup.
3 easy ways to put Christmas lights on a timer
- Plug-in outlet timer. The classic choice. Mechanical models use push pins for each 15 or 30 minutes; digital ones let you set exact times. Cheap, simple and no app needed.
- Photocell (dusk-to-dawn) timer. A light sensor turns lights on when it gets dark, and many models then switch off after a set number of hours. Great for outdoor displays because it follows sunset automatically.
- Smart plug. Control lights from your phone or voice assistant, set schedules, and use “sunset” timing on many apps. Perfect for the tree indoors, and outdoor-rated smart plugs exist for the porch.
Which timer should you pick?
| Option | Best for | Sets itself to sunset? | Needs Wi-Fi? |
|---|---|---|---|
| — | — | — | — |
| Mechanical outlet timer | Indoor tree, simple schedules | No | No |
| Digital outlet timer | Precise times, random “away” mode | Some models | No |
| Photocell outdoor timer | Roof lines, yard displays | Yes | No |
| Smart plug | Phone or voice control, routines | Yes, in many apps | Yes |
How to set up Christmas lights on a timer
- Count your strands and check the label. Make sure your lights’ total load is within the timer’s or plug’s rating, printed on the device.
- Use the right outlet. Outdoors, plug into a GFCI-protected, weatherproof outlet with an in-use cover.
- Set the schedule. A common setup is on at sunset, off around 10 or 11 p.m. Photocell timers handle the “on” part automatically.
- Keep connections dry. Lift plugs and timers off the ground and away from puddles and snow.
- Test it for one evening. Watch that everything turns on and off as expected before you rely on it.
One handy trick: put all your indoor lights (tree, window candles, mantel garland) on one power strip, then put that strip on a single timer or smart plug, staying within its rating. One schedule controls the whole room, and you only have one device to adjust when the days get shorter.
What does running the lights cost?
Here’s an example with LED lights. Say your whole display draws 30 watts and runs 6 hours a night.
- 30 watts × 6 hours = 180 watt-hours, or 0.18 kWh a night.
- At an example rate of 17 cents per kWh, that’s about 3 cents a night.
- Over 40 nights of the season, roughly $1.22.
Older incandescent strands use much more, which is another reason a timer helps: lights only run when someone’s around to enjoy them. If you’re curious where else plugs can trim your bill, see do smart plugs save money.
Safety tips for holiday lights
The Electrical Safety Foundation’s holiday safety tips recommend checking every strand for damaged cords, using outdoor-rated products outside and never overloading outlets. A timer adds another layer of safety because lights aren’t left running all night or while you’re away. Our holiday decorating safety guide covers trees, candles and more.
Quick FAQ
Can I put Christmas lights on a smart plug? Yes, as long as the lights’ total load is within the plug’s rating, and use an outdoor-rated smart plug outside. What is the best timer for outdoor Christmas lights? A weatherproof photocell timer is the easiest, since it turns on at dusk on its own. Is it safe to leave Christmas lights on overnight? It’s safer to switch them off when you sleep or leave, which a timer does for you.
Christmas lights on a timer: a quick recap
- Three options: outlet timers, photocell timers and smart plugs.
- Outdoors: use outdoor-rated gear in a GFCI-protected outlet.
- Bonus: lower power use and no lights burning all night.
Final thoughts
Put Christmas lights on a timer once, and the season gets a little easier every single evening. Pick the option that matches where the lights are, then enjoy the show. For more ways to automate your home, browse our smart home routines ideas.
Your turn: what time do your holiday lights go off at night? Tell us your schedule in the comments.
This guide is based on research, safety guidance and manufacturer information, not our own testing.
Related guides: What can you do with a smart plug? · What not to plug into a smart plug · Outdoor lighting for home security
