The Croquet Association
Is my lawn big enough for Croquet
    Croquet essentially involves hitting your ball through a series of hoops that forms a 'course', it is easy to have a fun game on almost any size and shape of lawn, and to adapt the course to suit the available area.

You do not need a lawn that is of 'bowling green' standard - indeed most people play very happily on a normal patch of grass. This said, the better the quality of the lawn, the less likely you are to be frustrated by random hollows and bumps!