Objective: Some information on the prevalence of adverse life experiences is available for the general population and college students, but the extent, nature, and severity of these events is unclear. Participants: The authors recruited undergraduate college students (N = 6,053) from diverse academic settings (public and private schools) and geographic locations. Methods: They examined the prevalence, nature, severity, and disclosure of adverse events, in addition to reports of posttraumatic stress disorder (PTSD) symptomatology within the sample. Results: Across multiple studies, prevalence rates of adverse events ranged from 55.8% to 84.5%, replicating previous findings in larger samples. In a subset of undergraduate students (n = 97) who the authors interviewed in greater depth, 9% reported symptoms of clinical PTSD and an additional 11% reported subclinical symptoms. Conclusions: Research using college samples for the study of stressful life events is a useful and reasonable strategy. The authors discuss implications for research, as well as screening and referral services at universities. (Contains 5 tables.)