This study, as the first empirical test of P–16 policy antecedents, reports the findings from an event history analysis of the origins of state dual enrollment policies adopted between 1976 and 2005. First, what characteristics of states are associated with the adoption of these policies? Second, to what extent do conventional theories on policy adoption help explain the rise of dual enrollment? We find state political characteristics, organizational structures, and policy conditions are associated with the spread of dual enrollment policies. Also, some states appear to have a climate for reform activity, resulting in a tendency to engage in innovative education policy making.