LETHBRIDGE, Alta. - The race to determine the next leader of Alberta's Progressive Conservative party officially kicks off Saturday night.

The party will launch the campaign at an event in Lethbridge, with the leader picked at a delegated convention in Calgary on March 18.

Progressive Conservative house leader Richard Starke and Donna Kennedy-Glans, a former PC MLA, announced their candidacies this week.

Former Conservative MP Jason Kenney and Calgary lawyer Byron Nelson are also running.

The party has been without a permanent leader for about 1 1/2 years.

The last leader, former premier Jim Prentice, announced he was leaving politics after the PCs were defeated by the NDP in the May 2015 general election.