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The championship starts with a league stage and then progresses to a knock out stage. The draw for the group stages of the championship were made on 30 April 2018.
Due to reconstruction of the stadium in 2018, Breffni Park was not used as a venue for any matches during this season's championship, except for the final.
All 12 teams enter the competition at this stage. A random draw determines which teams face each other in each of the four rounds. No team can meet each other twice in the group stage. The top 8 teams go into a seeded draw for the quarter-finals while the bottom 4 teams will enter a Relegation Playoff. If teams are level on points and a place in the quarter-final is at stake, a Playoff will be conducted to determine who goes through.
The 4 bottom placed teams the league phase will play off against each other. The 2 winners will maintain their senior status for 2019 while the 2 losers will face off in a Relegation-Final. The ultimate loser will be relegated to the 2019 Intermediate Championship.