The Dragons v Cardiff Blues RabioDirect Pro12 clash postponed because of a waterlogged pitch on 4 November will be replayed on Thursday, 15 March.
The derby will be screened on Scrum V Live on BBC Wales, kick-off 1905 GMT.
Tickets for the original fixture remain valid and ticketholders do not need to take any action in order to attend the game.
Heavy rain on the afternoon of the game saw one in-goal area completely submerged.
And despite the desperate efforts of the ground staff, referee Nigel Owens decided the conditions were unsafe.
A full house had been expected for the derby.