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Batteries -

When batteries of any kind are exposed to heat or temperature changes, a chemical reaction occurs and can shorten a battery's lifespan. Always keep power tools inside, in the garage, basement, or wherever they will be kept cool.

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Paint -

Paint is highly sensitive to temperature changes; the consistency can change with extreme cold and heat. Store paint in a cool, dark area, such as the basement.

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Fabrics -

While most people don't leave clothing, blankets, or sleeping bags directly outside, they may store them in a shed. However, any fabric should always be kept indoors to protect against mildew, mold, or pests like moths.

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Outdoor mosaics -

Any outdoor pieces made with ceramic or glass should be brought inside during the winter months if you live in a particularly cold area, as freeze-thaw cycles could lead to breakage.

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Sale items -

While yard sales are a great way to get to know your neighbors and make some quick cash, leaving items scattered around your yard with "for sale" or "free" signs can be an eyesore. 

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Wicker furniture -

Natural rattan or wicker furniture should be brought inside, especially during the fall and winter, as too much rainwater can weaken fibers and cause them to break. 

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Garden waste -

While fallen leaves and grass clippings can act as a fertilizer, heavy piles of detritus will smother your lawn and invite fungus and pests.

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Barbecue -

After the summer season, a grill cover can help keep the exterior surfaces of your barbecue clean and free from rust. Cooking on a rusty grill may even pose health risks.

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Pop-up gazebos and canopies -

Pop-up gazebos and canopies should never be left in your yard all year round. It's best to store them in a shed or garage at the end of the summer so they don't get damaged by rain or snow.

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Pets -

Dogs being left in the backyard all day or night could cause them to start barking and disturb your neighbors. Plus, leaving animals outdoors for long periods is harmful to their health.

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Electronics -

It's tempting to bring your TV or speakers outside when the weather's nice, but exposure to the elements can cause damage.

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Garden furniture -

While some materials, like concrete, teak, and plastic, can be left outside year-round, iron and wicker are susceptible to damage by cold weather. You'll need to bring any cushions or rugs inside the house for storage.

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Clay pottery -

Clay pottery will need to be brought inside during the winter, as changes in temperature can cause the material to crack. 

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Clothes -

While hanging your laundry out to dry on a clothesline is an eco-friendly and effective alternative to using a dryer, you shouldn't leave them outside for long periods, as it makes them vulnerable to rain and provides the perfect environment for mildew to grow.

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Sunscreen -

Sunscreen chemicals can deteriorate when left out in the sun, becoming less effective over time. Remember to take your sunscreen back inside after use and store it in a cool, dry place.

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Shoes -

Leaving shoes outside is never a good idea. Not only can they become damaged by rain or morning dew, but they may also become homes for bugs and small creatures.

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Cars -

It's not advisable to leave your car parked in your yard or driveway for long periods, as exposure to the elements can shorten tire and battery life. You may wish to buy a car cover if you have no way of installing a garage or carport on your premises.

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Trash -

Never pile trash up in your yard, unless you have a scheduled pick up for bulky items, like furniture. Not only is it unsavory to look at, but it can also attract pests. 

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Toys and games -

Always bring children's toys and games inside each night to keep them clean and in good condition. If left outside, they could be a tripping hazard or be susceptible to theft.

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Firewood -

Firewood left on the lawn will absorb moisture from the ground, making it unfit to start a fire. It's best to store firewood on asphalt or a tarp.

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Bug spray -

Like sunscreen, bug spray can lose effectiveness when exposed to the sun. Sunscreen can also be poisonous to animals and children, so it's best to store it in a cool, dry place inaccessible to little ones and pets.

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Garden hoses -

Garden hoses can crack if exposed to too much sun and rupture if water freezes inside during winter. Store them in a garden hose holder or the garage.

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Keys -

Leaving a spare key under the welcome mat or in a "secret" location in your backyard is unwise. Instead, buy an exterior key safe or leave your key with a trusted neighbor.

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Bicycles -

Not only are bicycles susceptible to theft if left unlocked in a yard, but exposure to the elements can cause rust and other damage.

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Debris from renovation projects -

It may be tempting to leave renovation debris in the yard at the end of an afternoon of hard work, but nails, shards of glass, and splintered wood can be dangerous, especially to children. 

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Yard products -

Weed killer, paint thinner, and fertilizers should never be left outdoors, as they could be deadly if ingested by a child or animal.

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Oily rags -

If a pile of oily rags in your yard starts to dry and heat up, the mixture of oil, heat, and oxygen can cause spontaneous combustion. Dry them first, then store the rags in water and detergent before disposing of them in a hazardous waste collection drive.

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Standing water -

Never leave standing water in your yard, whether in a bucket, kiddie pool, or plant pot, as it will become a breeding ground for mosquitoes.

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Garden tools -

Garden or power tools are also a target for thieves, so always store your pricey yard equipment in a secure location as soon as you're done using them.

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Garden tools -

Despite the name, garden tools, like lawnmowers, should never be left outside. Exposure to moisture or rain can cause some equipment to become inoperable.
Sources: (Reader's Digest) (Southern Living)
See also: Creative ways to attract wildlife to your garden

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