That's a really smart question to ask, especially if you're in a place with intense summer sun. I've wondered the same thing! The short answer is: it depends entirely on the type of plastic.
Most modern outdoor trash cans are made from materials like polyethylene (like HDPE or LLDPE) or polypropylene. These are designed to be quite heat-resistant and can typically handle temperatures well above what a sunny day throws at them (think 120-140°F/49-60°C+). They might get a bit soft or flexible in direct, relentless heat, but they usually won't permanently warp or melt.
However, cheaper, thinner plastics—think of some lightweight indoor bins accidentally used outside—are definitely at risk. They can become misshapen, brittle, or even sag. Dark-colored cans also absorb more heat, increasing the risk.
A few tips to be safe:
1. Check the Material: Look for "UV-resistant" or "all-weather" labels when buying.
2. Provide Shade: If possible, place your cans in a shaded spot during the peak afternoon sun.
3. Avoid Overfilling: A overstuffed bin is under more structural stress if the plastic softens slightly.
4. Be Cautious with Contents: Never toss hot ashes or freshly used charcoal from a grill directly into a plastic bin.
So, while a quality outdoor bin should be fine, giving it a little break from the direct sun is always a good idea for its long-term health. It saves you from a messy, melted surprise!