The embodiments of the present disclosure provide systems and methods for outbound forecasting, comprising receiving an initial distribution of postal codes mapped to each region, running a simulation of the initial distribution, calculating an outbound capacity utilization value of each FC, determining a number of FCs comprising an outbound capacity utilization value that exceeds a predetermined threshold, feeding an optimization heuristic with at least one of the postal codes mapped to a region from the initial distribution to generate one or more additional distributions of postal codes, generating an optimal distribution of postal codes mapped to each region based on the one or more additional distributions of postal codes, and modify an allocation of customer orders among a plurality of FCs based on the generated optimal distribution of postal codes. Running the simulation may comprise simulating an allocation of customer orders based on the initial distribution of postal codes.