It depends on the terrain, the mower, and the grass. Rough terrain can always affect the quality of the cut, depending on the mower, and some mowers handle dense grass better than others. Steep banks that typically occur on the sides of roads or in back yards often easy to mow as long as it is within a safe incline radius. Make sure it does not slope more than 15 degrees and you will be safe to mow it. Tradition tractor style riding lawn mowers work just as well as zero turn mowers for steep banks often times.