Ratios of stable isotopes in feathers have great potential for identifying the connectivity of bird migrations and the origin of harvested individuals of game species. In particular, the relationship between the hydrogen ratio due to latitudinal variation in precipitation (δD_p) and that in feathers (δD_f) is often used to determine unknown individuals' latitude of origin. We assessed this relationship between Canada Geese nesting in the temperate zone (Branta canadensis maxima) and the subarctic (B. c. interior). For this game species, the origin of harvested birds is important for developing management that maintains a desirable level of harvest while ensuring continued viability of all subspecies and breeding populations. We collected freshly grown primaries from three populations of interior and five of maxima and analyzed them for δD, δ¹³C, and δ¹⁵N. Multivariate analysis suggested no overall differences in isotopic composition between subspecies. A univariate assessment indicated a significant difference in δ¹⁵N_f, despite substantial overlap between subspecies, and no difference in δD_f or δ¹³C_f. Of particular interest is the lack of difference in δD_f, despite the large latitudinal differences in δD_p and between the subspecies' breeding ranges. Values of δD_f averaged -131.85‰ ± 1.36 for interior, -131.63‰ ± 0.71 for maxima, and we found no overall relationship between δD_f and δD_p. Overall, our results suggest that δD, δ¹³C, and δ¹⁵N alone have limited ability to discriminate between subspecies interior and maxima and hence have limited applicability for estimating the origin of harvested birds and/or identifying molt migrants of maxima.