Eleven county teams compete in the Senior Championship (tier 1). Sixteen lower-ranked county teams plus the second teams of tier 1 counties compete in the Intermediate (tier 2) and Junior (tier 3) Championships.
The eleven teams are drawn into one group of six and one group of five. All the teams play each other once. Three points are awarded for a win and one for a draw.
Knock-out stage
The two group runners-up and the two third-placed teams play in two quarter-finals.
The two group winners and the two quarter-final winners play in two semi-finals.