If you’re wondering how heavy is a bench, the honest answer is: there is not one universal urban bench weight, because “urban bench” covers a lot of styles. Most standard park-style benches sit between 80 and 180 pounds. A typical 4-foot bench with cast iron sides and wooden slats weighs about 110–140 lb. If it is a 6-foot version, expect more like 150–220 lb.
Material matters more than size when you are moving a bench around your yard. As a rough bench weight by material guide, powder-coated steel benches often weigh 60–120 lb, which is manageable for one person with a dolly. Recycled plastic benches are similar, maybe 70–130 lb. Concrete or stone benches are a completely different animal — they can easily weigh 300–600 lb, so do not try to drag one across grass by yourself.
If you need to move the bench regularly, I would treat anything over 100 lb as a two-person job or use a hand truck with pneumatic wheels. Lift from the frame, not the armrests, because armrests can bend or snap. For heavier benches, place two furniture dollies under the legs and roll it like a cart. On soft ground, lay down plywood strips to keep the wheels from sinking.
So my rule of thumb: lightweight urban bench, 60–120 lb, move it solo with a dolly; standard wood-and-metal bench, 120–220 lb, use a helper or a hand truck; concrete or stone bench, 300 lb plus, rent or borrow a heavy-duty cart and get at least two strong people.