Great question—and honestly, the answer depends almost entirely on what the bench is made of. On a cold day, some outdoor benches feel like sitting on an ice block, while others are only mildly chilly and perfectly usable with the right clothing.
Metal benches are usually the worst offenders. Aluminum, steel, and cast iron pull heat away from your body extremely fast, so even at 40°F or 50°F they can feel sharply cold within seconds. If there has been frost or freezing temperatures overnight, a metal bench can genuinely be too cold and uncomfortable to sit on for more than a minute or two, especially through thin pants.
Stone and concrete benches behave a lot like metal. They have high thermal mass and stay cold long after the air temperature rises, so they tend to feel hard, cold, and uninviting in winter. You might manage with a thick coat or insulated pants, but they are rarely a cozy choice.
Wood benches are much more forgiving. Wood does not conduct heat away from your body nearly as fast as metal or stone, so a wooden bench on a cold day usually feels cool but not painfully cold. If the sun is out and the bench is dry, it can actually feel fairly pleasant for a short sit.
Plastic, recycled plastic, and composite benches fall somewhere in the middle. They do not get as bone-chilling as metal, but they can still feel cold in freezing weather because they are dense and smooth. Darker plastics warm up a bit in direct sun, which helps.
A few real-world things matter just as much as material. Sunshine makes a huge difference—benches in direct sun feel noticeably warmer than shaded ones. Wind exposure also matters; a bench in a sheltered corner is more comfortable than one in an open breezy area. And your clothing is a big factor. Jeans or thin leggings do little to block the cold, while lined pants, thermal layers, or a long coat make even a cold metal bench tolerable for a short rest.
So, are outdoor benches too cold to sit on? Metal and stone benches can definitely be too cold on a frosty day, but wood, composite, or sun-warmed plastic benches are usually fine for a brief sit—especially if you dress for the weather or bring a small cushion. If I had to pick one for a winter park visit, I would look for a wooden bench in the sun.