Immigrants in Western countries in general participate less in politics, and show lower levels of political efficacy, than native-born citizens. Research is scarce when it comes to immigrants’ knowledge about politics and public affairs in their new home country, and about what happens with this knowledge over the years. This paper focuses on immigrants in Sweden, a country known for ambitious multicultural policies, but where immigrants also face disadvantages in areas such as labor and housing markets. Utilizing particularly suitable survey data we find that immigrants in general know less about Swedish politics than natives, but also that this difference disappears with time. Exploring the positive influence of length of residence on political knowledge, the paper shows that the positive effect of time in Sweden among immigrants remains after controlling for an extensive set of background factors. Moreover, the paper examines this political learning effect through the lens of an Ability– Motivation–Opportunity (AMO) model. The findings suggest that the development of an actual ability to learn about Swedish politics—via education in Sweden, and by improved Swedish language skills—is an especially important explanation for the increase in political knowledge.