The five candidates met with party leadership Thursday in Montreal to iron out details.
Media mogul Pierre Karl Peladeau is the perceived front-runner in a race that also includes current PQ caucus colleagues Bernard Drainville, Alexandre Cloutier and Martine Ouellet.
Another candidate is Pierre Cere, a spokesman for a group that defends the unemployed.
The leadership campaign officially kicked off Wednesday.
The debates will run every two weeks beginning Mar. 11 and a new leader is expected to be announced as early as mid-May.
The five candidates expressed an interest in participating in other debates outside those agreed upon Thursday.
The next provincial election is scheduled to be held in September 2018.