This study evaluated the efficacy of an online stress management program among community college students (N = 479). The online program was designed to increase present control, decrease mental health symptoms, and improve academic performance by means of an online mental health intervention (OMHI). Sections of a college readiness course (N = 28) at a community college were randomly assigned to one of three conditions: present control intervention (PCI), present control intervention with supportive messages (PCI + SM), or a comparison (COM) group. Participants in the PCI and PCI+ SM completed the same online intervention; however, the PCI+SM group received weekly supportive messages while completing the program. Participants were asked to complete self-report measures of present control, perceived stress, and mental health symptoms at pre-intervention, post-intervention, 3-week follow-up, and 6-week follow-up. Academic data for participants including official semester grade point averages (GPAs) and percentage of credits completed was obtained. Of the 479 participants, approximately 66% (n = 318) completed the post-intervention, 24% (n = 117) completed the 3-week follow-up, and 19% (n = 92) completed the 6-week follow-up surveys. All interactions between time and condition were non-significant suggesting that the three conditions were approximately equally effective for mental health outcomes. The between-group effect sizes comparing the PCI groups to the COM group for mental health outcomes from pre- to post-intervention were in the minimal to small range (d = -.08 to d = .14). Within-group effect sizes measuring change on mental health outcomes from pre- to post-intervention were also in the minimal to small range (d = -.15 to d = .26). There were no significant differences in academic outcomes between conditions, and the between-group effect sizes were in the minimal to small range (d = -.17 to d = .02). Explanations for why the PCI conditions were not more effective are provided. In addition, limitations and future directions are discussed.