Canada has often been seen as immune from the powerful backlash against globalization and immigration that has driven political shifts elsewhere. This article challenges this belief, at least in part, by tracing the evolution of public attitudes toward immigration and analyzing the factors that have shaped the trajectory for over three decades. Drawing on nearly forty years of Environics Focus Canada surveys, combined with annual data on macro-economics and immigration flows, findings here suggest that Canadians’ tolerance toward immigration responds to immigration flows and is heavily influenced by macro-economic conditions.