Wait until the ground is damp not soaked and muddy but if conditions are dry you wont be doing anything but stripping the grass. They only make a few sizes for push type rollers, just remember the bigger they are the harder they are to push! I have a 24" wide one and when its 1/2 to 3/4 filled its freakin heavy!
J and B Lawncare:
On our own as of 2003. Proud to be a full time, legitimate company.
Equipment we use:
Pro Line and GatorMade trailer's
Gravely, Exmark, Honda and Snapper mower's
Echo trimmer's and blower's
New Holland and Dresser loader's (snow removal)
Fisher snow plow's
DownEaster and Fisher salt spreader's
TurboTurf fertilizer tank