It often remains unclear how young citizens are combining various forms of political participation, as well as why they choose some over others, especially within a single-issue movement. Moreover, little is known about how social networking sites (SNS) fit into the political repertoires of citizens. Therefore, this study explores youths’ political participation patterns in the context of the 2019 youth-led climate strikes. We rely on data from a paper and pencil survey among 498 high school students in Belgium. To identify different types of activists, the study used latent class analysis (LCA). In addition, a multinomial logistic regression was conducted to assess how identified participation types differ from each other. Four different participation repertoires regarding the climate issue were identified, each distinctive in the way they rely on different forms of political participation. In addition, membership to each of the different classes is associated with a unique set of characteristics (in terms of political efficacies, climate issue involvement, and online expression motives). The article shows how SNS make up a crucial part of youths’ issue-specific participation patterns and sheds light on the mechanisms underlying their participation choices within the climate movement.