This study investigated second language fluency development over a nearly 2-year period which included an academic year abroad and the year immediately following the participants' return to their home university. Data from 24 L1 English learners of Spanish were collected 6 times: once before, 3 times during, and 2 times after a 9-month stay abroad. Participants were recorded orally retelling a picture-based narrative, and data were coded for 9 measures of utterance fluency. Results indicated different developmental trends: Gains in speed fluency appeared quickly and were maintained after the return from study abroad, whereas gains in breakdown fluency often took longer and were more sensitive to attrition after returning home. There were no changes over time in repair fluency. These results appear to indicate that some fluency improvements are more robust and less likely to be affected by the change in context (study abroad vs. home country). The findings fill a gap in our understanding of the relationship between oral fluency development and second language speech production processes, and have implications for study abroad researchers as well as post-study abroad instruction.