Riding mower having multiple cutting units

A riding mower has multiple cutting units visible to the operator when mowing, and easily accessible for service and maintenance work. The riding mower chassis has a front end, a rear end, a left rail, a right rail, a pair of front wheels mounted at the front end, and a pair of rear wheels mounted adjacent the rear end. At least a portion of the left rail and right rail extend from under the operator module to define an uncovered area between the left rail and right rail adjacent the front end of the chassis. A first row of cutting units may be in front of the pair of front wheels, and a second row of cutting units behind the pair of front wheels. One of the cutting units in the second row may be positioned in the uncovered area between the left rail and the right rail.