Moral judgments are known to change in response tochanges in external conditions. But how variable aremoral judgments over time in the absence of environ-mental variation? The moral domain has been describedin terms of five moral foundations, categories that ap-pear to capture moral judgment across cultures. We ex-amined the temporal consistency of repeated responsesto the moral foundations questionnaire over short timeperiods, fitted a set of mixed effects models to the dataand compared them. We found correlations betweenchanges in participant responses for different founda-tions over time, suggesting a structure with at leasttwo underlying stochastic processes: one for moral judg-ments involving harm and fairness, and another formoral judgments related to loyalty, authority, and pu-rity.