What should not be stored in a garage

Garages can get hot, cold, damp, and dusty. That makes them a poor home for many household items with special storage instructions.

Mind temperature and safety

Check labels before storing chemicals, paint, food, sensitive electronics, or valuables. When in doubt, use a conditioned area or local disposal guidance.

Garages seem like an obvious place to store everything that does not fit anywhere else in the house. They are often the default holding area for items without a better home, overflow from closets, and supplies that feel too utilitarian for the main living space. But garages are exposed environments — temperatures swing dramatically between seasons, humidity can be high, pests find easy entry, and air quality is often poor. Many common household items are actively damaged or made more dangerous by garage storage.

Knowing what not to store in a garage is as important as knowing how to organize one. Some of these decisions are about protecting your belongings. Others are about protecting your home and family.

Temperature-sensitive items

Many materials degrade when exposed to repeated temperature cycling — freezing cold in winter, intense heat in summer. Wine and spirits stored in a hot garage will change flavor and, in extreme heat, may push the cork and oxidize. Canned food can expand and crack in a freeze, and some vitamins and medications lose potency or become unsafe when exposed to heat.

Electronics are damaged by heat, cold, and humidity cycles. A hard drive, camera, or spare laptop stored in a hot garage may appear to survive the summer but have already sustained silent damage. Musical instruments — guitars, violins, brass — warp, crack, and lose tuning when exposed to fluctuating temperature and humidity. Move all of these to a climate-controlled area.

Flammable and reactive chemicals

Many common household chemicals are flammable and should be kept only in small quantities in the garage, stored far from heat sources and electrical panels, with original labels intact. Gasoline for power equipment, propane cylinders, paint thinner, and aerosol cans all fall into this category.

Check local fire codes for specific requirements, but as a general rule: keep fuel cans tightly sealed, store them away from water heaters and appliances with pilot lights, and do not stockpile more than you will use in a single season. Old gasoline that has been sitting for more than six months degrades and can damage small engines — so storing a full can from spring through winter is counterproductive anyway.

Paint and stains

Leftover paint is one of the most common garage storage errors. Paint freezes in a cold garage, making it unusable. Even paint that does not fully freeze can develop a thick, lumpy texture that makes it difficult to work with. Latex paint is particularly vulnerable to freezing. Store touch-up paint inside the house in a conditioned space, and dispose of paint you will not use through a local hazardous waste program.

Pet food and birdseed

Open bags of pet food and birdseed stored in a garage are one of the leading causes of rodent infestations. Even a small quantity of accessible food can attract mice, rats, and other pests that will then find their way into the rest of the home. If you must store pet food in the garage, transfer it to a metal or hard plastic container with a secure lid. Do not leave bags loosely rolled or clipped.

Important documents and photographs

Paper documents, photographs, and financial records degrade quickly in environments with high humidity and temperature swings. A single summer in a hot garage can yellow and warp photographs irreversibly. Important documents — passports, deeds, birth certificates, insurance policies — belong in a fireproof box inside a climate-controlled space, not in a filing cabinet in the garage.

Clothing, bedding, and fabric

Fabric stored in a garage is vulnerable to moisture, mold, mildew, and pest damage. Moths, mice, and silverfish all find fabric appealing. Sentimental items like vintage clothing, heirloom quilts, or seasonal costumes should be stored inside the home in sealed containers, not in a cardboard box on a garage shelf.

Propane tanks

Small propane cylinders — the type used with camping stoves and portable heaters — should never be stored inside a garage or any enclosed structure. Even a tiny leak in a confined space can create a dangerous accumulation of flammable gas. Store propane cylinders outdoors in a well-ventilated area, away from direct sunlight and heat sources, in an upright position.

A simple rule for anything else

When in doubt about any item, ask two questions: Is it temperature-sensitive? Is it a food or attractant? If yes to either, move it to a better location. The garage is an excellent working and storage space for the right categories of items. Protecting it from the wrong ones is what keeps it that way.