Methods, systems, and computer program products for calendar-based coverage monitoring are disclosed. According to one aspect, a method includes receiving a coverage rule defining multiple covering entities for performing an activity for a covered entity and at least one period of time during which the multiple covering entities is to perform the activity. Individual calendars for the multiple covering entities are monitored and a change in one of the calendars is detected. It is then determined whether the change causes the coverage rule to be violated, and in response to determining that the change causes the coverage rule to be violated, a notification indicating violation of the coverage rule is generated.