This study explores what young Danish learners found anxiety-provoking or difficult in their English as a foreign language (EFL) classes. Participants (n = 32) were early and later starters (ages 8 years vs. 10 years) at two primary schools where children were not assessed in English. The qualitative inquiry aimed to examine what differences characterized 8- and 10-year-old children's views and how their foreign language classroom anxiety (FLCA) changed over time. Semi-structured interviews were conducted with each child in one-on-one settings and the answers were analysed by thematic analysis. The emerging themes revealed three main categories of situations that made children anxious. The first one concerned being afraid of making mistakes. The second category comprised social situations in which children were asked to speak in English in front of their peers and they were anxious that other children would criticize them or laugh at them. The third category comprised situations in which children felt insecure, for example, they did not understand their teacher's talk in the target language, did not know the meaning of words they were supposed to learn, did not understand the task at hand, or they had to do tasks they thought were beyond their abilities. Children who experienced a decrease of FLCA after one year of instruction indicated that appropriate support from the teacher had reduced FLCA in some of these situations. Pedagogical implications of the different causes of anxiety are discussed.