This paper constructs an electoral hostility index for 282 local direct elections (Pilkada) of district heads during 2005–07 and examines the socio-economic determinants of local democratic maturity in Indonesia. There are 67 Pilkada (out of 282) categorised as having medium, high or very high levels of electoral hostility. The picture is dominated by hostilities directed towards the local elections commission after voting day. The large sample quantitative analysis employs ordered logistic regression. The results show some evidence in support of the modernisation hypothesis in the context of Indonesia’s local democracies. Higher Pilkada hostility or less mature local democracy tends to be experienced by districts with lower income, higher poverty incidence and less urbanised. The results also imply that democracy cannot be deepened in the absence of economic development.