Here we evaluate differences in P export during snowmelt between small watersheds under annual cropland (>60 site years) or those that have been converted to perennial forage (>20 site years). Through this metanalysis we hope to identify interactions between soil P fertility and vegetation characteristics that may drive P loss or sorption of leachate, whether a consistent background signal of P loss from frozen perennial vegetation is detectable, and whether vegetation characteristics such as greenness at time of freezing might predictably influence potential for runoff P losses. Concentration-discharge relationships (C-Q) over the course of snowmelt will be utilized to identify any differences in the timing of P loss from watersheds under annual cropland or perennial forages and whether source or transport limitation may occur with differing size of runoff events, with contrasting levels of soil P, or in response to contrasting crop residue characteristics.