This study conducted two cluster randomized trials using household-level random assignment to test the impact of a rewards cards program at two different locations: Wabash County Indiana and the City of St. Louis. Findings show the treatment group in Indiana had a greater than three-fold increase in savings activity in CSAs, and in St Louis had a greater than seven-fold increase in savings activity in CSAs. These findings suggest that rewards cards can be an effective strategy for engaging families of different backgrounds in saving activities.