That's an excellent question, as UV radiation from the sun is one of the biggest threats to the longevity of outdoor products. The resistance of an outdoor trash can to UV radiation depends almost entirely on the materials it's made from.
Most quality outdoor trash cans are manufactured with UV-inhibited materials. For plastic bins, which are the most common, this means the plastic resins are compounded with special additives that absorb and reflect the sun's harmful rays. Think of it as a built-in sunscreen for the bin. High-density polyethylene (HDPE) is particularly good at this. Without these inhibitors, plastic becomes brittle, fades dramatically, and can crack in a surprisingly short amount of time.
Metal bins, typically made from galvanized or powder-coated steel, offer inherent UV resistance. The sun won't break down the metal itself, but it can degrade the protective coating over many years, potentially leading to rust if the coating is compromised.
When shopping, look for specifics. Some manufacturers provide a UV resistance rating or guarantee, such as "UV-protected for 10 years." This is your best indicator of long-term performance. In general, a high-quality, UV-protected trash can should maintain its structural integrity and resist significant fading for many years, even in direct, all-day sun. Darker colors also tend to resist visible fading better than lighter ones, though the underlying material strength is what truly matters. Ultimately, investing in a bin designed with UV resistance is crucial for preventing cracks, breaks, and a prematurely weathered appearance.