1. A method comprising: identifying a size of a geo-fence; identifying a size of a position uncertainty area for a location determination module, the position uncertainty area being based on an estimated accuracy error of a location for a computing device provided by the location determination module; and determining occurrence of one or more geo-fence events for the geo-fence based on a confidence level that varies based at least in part on both the size of the geo-fence and the size of the position uncertainty area.