The Blues went down 25-48 to the Dragons in the Celtic League, completing a black Saturday for the region and the Cardiff club after the Blue & Blacks had earlier lost 22-33 at home to Bedwas in the Premier Division.
Both teams had the benefit of early leads only to be overpowered in the second half. But the Blues salvaged something from their heavy defeat at Rodney Parade by scoring a fourth try in injury time to keep their Heineken Cup qualification target alive.
Blues' match report can be found under Fixtures & Results.
Judgement Day is back at the Millennium Stadium for 2015 with the Welsh Rugby Union (WRU) and Regions confirming today that tickets will cost just £10 per head to see all four of Wales' GUINNESS PRO12 sides in action under one roof.
Battling Cardiff Blues produce a performance of full pride and heart in adversity as they lost out to reigning champions Leinster Rugby in a pulsating Guinness PRO12 encounter at BT Sport Cardiff Arms Park.
Cory Allen scored the only try of the game as Cardiff Blues edged an absorbing and dramatic Welsh derby with Newport Gwent Dragons at Rodney Parade to open 2015 in the Guinness PRO12 with a crucial victory.