Objective: To examine whether a remote, online, group-based mindfulness intervention maintains long-term effects at one-year follow-up. Participants: 61 college students (38 in the intervention group, 23 controls) completed the follow-up survey. Methods: Follow-up to an RCT using a 4-week Koru Mindfulness program, investigating pre-to-follow-up changes in the intervention group compared to control participants. Results: The intervention produced significant follow-up effects, as assessed by a time by group interaction in a MANOVA (Cohen's d = 0.59), with univariate effects for four of our 21 variables, compared to reliable posttest effects for 16 of these variables. Post-intervention practice maintenance was low (on average participants practiced once a month); continued practice correlated with treatment gain in two of our mindfulness variables, stress, worry, and anxiety. Conclusions: We found some evidence for maintained benefits one year after a remote, online, group-based mindfulness program, as well as modest evidence for the benefit of continued practice.