How do you know when to float poured concrete?

You should float poured concrete when the surface has begun to set but is still wet and workable, usually within 1 to 3 hours after pouring, depending on the conditions. The surface should appear dull and lose its sheen, indicating it's ready for floating. Use a magnesium or wooden float to level and smooth the surface without pulling too much aggregate to the top. Timing is crucial; if you float too early, it can lead to a rough finish, while waiting too long can make it difficult to achieve a smooth surface.