We know that populism influences turnout and vote choice. Yet, we know surprisingly little about how populism drives broader participation patterns. In this study, we argue that populist citizens are more likely to participate in politics beyond the electoral arena because they hold specific political grievances. Extant literature highlights the multidimensionality of participation but remains ambiguous about how many or what dimensions it entails. We rely on an unprecedented 16-item participation battery from a comparative survey in nine European countries to design distinct theoretical and empirical lenses through which to examine the relationship between populist attitudes and political participation. The former relies on operationalisations from the literature that are confirmed by confirmatory factor analysis, while the latter relies on latent class analysis. Both frameworks return similar results, highlighting that populist citizens are effectively more likely to participate across the board, regardless of the form or classification of political participation.