The study examined personal growth among new grandfathers (n = 101, age 45-67), 2 to 24 months after the birth of their first grandchild. Specifically, it investigated the contribution of internal resources (self-esteem), perceived characteristics of the situation (grandparenthood distress and cognitive appraisals of threat, challenge, and self-efficacy), and external resources (perceived marital relationship) to the experience of growth. Associations with several background variables, including age, education, health and economic status, grandchild's age, and frequency of grandfather-grandchild meetings, were also examined. The results showed that lower internal resources, a positive assessment of the situation, and lower education were most closely associated with a higher experience of growth in first-time grandfathers. The discussion relates to the uniqueness of focusing on grandfathers and the potential for personal growth in this new family role. (Contains 3 tables.)