**In the Côte-du-Sud riding, trader consensus reflects a highly competitive multi-party contest ahead of the October 5, 2026, Quebec general election.** Incumbent Mathieu Rivest (CAQ) faces strong challenges from Frédéric Poulin (PCQ), Valérie Hamel (PQ), and Nancy St-Pierre (PLQ), with projections showing the top three parties clustered within a few points of each other in a riding that has shifted from a CAQ stronghold. Provincial trends have compressed the CAQ’s previous margin, as support fragments toward the PCQ in rural and agricultural areas and the PQ rebuilds its regional base. Poulin’s established local profile and prior strong showing, combined with Hamel’s recent nomination and community ties, sustain the tight positioning. Recent candidate announcements and the formal start of the campaign have not yet produced decisive separation. Upcoming events such as the close of nominations, advance voting, and leader appearances in the Bas-Saint-Laurent region could shift momentum if they highlight specific local priorities like agriculture, infrastructure, or services. The current balance leaves room for late movement driven by turnout patterns or targeted outreach among key voter segments.