Always use GFCI for outdoor lights.

Yes, you should use a GFCI outlet for outdoor holiday lights — and you need an outdoor-rated extension cord too.

GFCI outlets are required by code for outdoor receptacles because they cut power if there’s a ground fault. Water, snow, and damaged wires are real risks with holiday lights. That little test/reset button could save you from a nasty shock.

But the extension cord matters just as much. You need one marked for outdoor use — look for “W” or “WA” on the jacket. It has a heavier gauge and sealed plugs that keep moisture out. Don’t use a cheap indoor cord, even in a covered spot.

Also, don’t daisy-chain cords. One long cord rated for the wattage is safer than plugging three together. Keep all connections off the ground, ideally inside a weatherproof cover.

Your lights look great. Don’t let a preventable shock ruin the season.