To provide insight into poorly understood diabetes self-management among emerging adults with type 1 diabetes (TID) experiencing transitions, this study described their diabetes self-management-related habits, routines, and disruptions as well as explored relationships among habits and routines. A qualitative study, guided by critical incidence technique, was conducted. Participants were asked to describe situations when they did and did not check blood glucose, administer insulin, eat meals, and exercise as planned. They were also asked to describe activities in a typical day and in association with diabetes self-management. Content analysis with a priori definitions of habits and routines was performed. Participants described diabetes self-management-related transitional disruption as forgetting and disorder. They described habits associated with checking a blood glucose, giving an insulin dose, eating a meal, and initiating exercise. They described routines in association with meals, exercise, and overall diabetes management. These findings provide information on variables to target in intervention research.