The direct answer is: it depends entirely on the furniture's materials and construction. Not all urban outdoor furniture is created equal for braving the elements. True all-weather or winter-resistant pieces are specifically engineered for this purpose. They are typically made from materials like powder-coated aluminum, teak, certain high-density plastics (HDPE), or stainless steel, which resist moisture, cracking, and corrosion. Leaving non-hardy furniture outside can lead to irreversible damage like rust, warping, and fabric rot.
To ensure your furniture withstands the winter, first verify its specifications. Look for labels like "all-weather," "weather-resistant," or "four-season." Even suitable furniture benefits from proactive care: give it a thorough cleaning, apply protective sealants (for wood), and use high-quality, breathable waterproof covers. For extreme climates, storing cushions and lightweight items indoors is always best. Ultimately, investing in purpose-built winter-resistant furniture and providing basic protection will allow your urban outdoor setup to emerge beautifully intact each spring.