This article uses a stress carryover perspective to examine the association between school spillover and mental and behavioral health outcomes among college undergraduates. School spillover occurs when the obligations and pressures of student life extend into other domains through shared behaviors or stress. The sample (N = 250) consisted of undergraduate students between the ages of 18 and 29 enrolled at a midsized midwestern university. Findings showed that on average, students reported a moderate level of school spillover. Among mental health outcomes, school spillover was positively associated with feeling nervous, restless or fidgety, worthless, depressed, and hopeless. Among behavioral health outcomes, results showed that school spillover was negatively associated with sleep hours per night and positively associated with number of sex partners. Contrary to past empirical studies, school spillover was not significantly associated with drinking or binge drinking. Findings have implications for those who work in student support and campus mental health services.