That's a great and very practical question! The answer really depends on the specific model and brand you purchase. Most outdoor trash cans, especially the larger and more durable ones made from materials like resin, metal, or heavy-duty plastic, typically require some assembly. They usually come in a box with the main body, lid, hinge components, and sometimes wheels separated. The good news is that manufacturers design this process to be user-friendly. For the vast majority of models, you'll likely only need a simple screwdriver or an included Allen wrench, and the process often takes just 10-20 minutes. The instructions are generally clear, involving attaching the lid, securing the hinge mechanism, and maybe putting on the wheels or a foot pedal.
However, some basic, smaller plastic bins might come fully put together. It's always best to check the product description before buying. Look for phrases like "minimal assembly required," "tools included," or "fully assembled." If easy setup is a priority for you, I'd recommend looking for models that highlight "tool-free assembly" or "quick-lock" features. So, while you shouldn't expect them to arrive ready-to-use straight out of the box, putting together a standard outdoor trash can is generally a straightforward and simple task for one person.