||The literature is rich with studies about accessibility to opportunities. However, most of these studies focus on driving or assume a fixed transit travel time between origins and destinations. Using the Utah Transit Authority's (UTA) public transit network, this research uses temporally dynamic public transit travel times in an effort to explore spatiotemporal variability in accessibility. We make use of new tools to transform freely available General Transit Feed Specification (GTFS) data into a routable Esri Network Dataset (ND). This research examines how accessibility provided by public transit fluctuates through the estimation of minute-by-minute transit travel times between all census block groups (CBGs) in the Wasatch Front. In addition, because research has shown that different social groups travel at different times of the day and for different purposes (work, school, health care, etc.), this research examines how fluctuations in accessibility differentially affect the transit-dependent population. As a result, we will depict how social inequality in transit provision can be viewed through both spatial and temporal lenses.