Quick answer: four things, in this order — tighten every screw joint, touch up the paint at the welds, decide what stays outside, and store the small pieces dry. Twenty minutes now saves a replacement in spring.
1. Tighten every joint before the freeze
Metal does not shrink, but water does what it likes inside a thread. A joint that is snug in October will have a film of ice in it by January, and ice is a wedge. Back each joint off a quarter turn, wipe it, put a dab of silicone grease on it, and tighten it home again.
2. Touch up the paint at the welds
Powder coat is tough, but the bead at a weld is where chips start. Run a thumb along every weld on your stakes, planters and candle holders. Any spot that feels like a pit gets a dot of clear enamel. This is the cheapest thing you can do for a metal piece, and the one most people skip.
3. Decide what stays out and what comes in
Powder-coated steel can stay outside all winter; anything with a candle cup or a glass element should not. Our garden stakes and metal planters live outside. The candle holders come in, mostly so the wax does not crack in the cold.
4. Store the small pieces dry
Never put a wet piece into a closed box. Condensation is what actually rusts metal, and a sealed tub with a damp statue in it is worse than open weather is. Let everything dry in the open for a day, then store it somewhere with airflow.
5. What not to do
Skip the plastic tarp. Wrapping a piece in plastic traps moisture against the finish and is the fastest route to blistering. If you want to cover something, use a breathable cloth and leave the bottom open so air can move.
Two pieces worth checking first
If you only have time for two, do the arched window wall planter and the lighthouse statue — both have a base that traps water, and both are heavy enough to heave if the ground moves under them.
[…] A fuller seasonal list sits in our fall checklist for metal garden decor. […]
[…] Install before the ground freezes, then check the chain after the first hard freeze. Ice built up in a cup should be broken out rather than left to sit, because a full cup of solid ice puts a static load on the link above it that the hanger was not designed for. The failure point is almost never the metal, it is the water it holds — the same conclusion we reached in the fall checklist for metal garden decor. […]