Political parties in Canada oscillate between periods of inter-election quiescence and active electoral year mobilization. This article moves beyond vote share accounts of party system change by using the financial accounts of local associations and central party organizations to track these patterns in the New Brunswick party system. The analysis covers several electoral cycles encompassing government turnover and the rise of a flash party. Ecological models rooted in electoral district-level data (including measures of party activity based on their annual financial records, census data describing the electoral districts and conventional aggregate electoral data) are developed to provide a more nuanced account of a party and party system change than those based on simple election results. The findings demonstrate that even in a period of remarkable electoral flux, party activity and success appears to be rooted in diverse constituency social and political contexts.