Although levels of pollutants accumulated in organisms and related deleterious effects may vary in time, few studies have investigated inter-annual and inter-seasonal variations in metallic trace elements (MTE) accumulation and effects in terrestrial animals chronically exposed in contaminated environments. Concentrations of Cd, Pb and Zn were measured in liver and kidneys of free-living bank voles (Myodes ex-Clethrionomys glareolus) along a metallic soil pollution gradient in autumn (2006) and spring (2007, 2008). Body contition and somatic indices, as well as proportions of individuals showing higher renal Cd and Pb than toxic thresholds, were calculated to assess potential metal-induced stress. Bank voles accumulated MTE and concentrations of non-essential metals reached high values (up to 266 and 1085 µg.g-1 dw for Cd and Pb, respectively). We found inter-annual and inter-seasonal variations in MTE levels, but these differences were metal- and organ-dependent. Results were more contrasted for Cd and Zn than for Pb. While Pb in both liver and kidneys exhibited inter-seasonal variations (spring < autumn), Cd and Zn showed different patterns among organs and variations between years with no straightforward seasonal effect. The proportion of individuals exceeding toxic thresholds and the relationships between internal concentrations and body condition or somatic indices did not significantly differ between seasons or years. In an ERA perspective, these results question the interpretation of a single measure of MTE concentrations over time. They moreover highlight the need of temporal monitoring of MTE transfer in food webs, which could improve fundamental knowledge on factors affecting exposure and bioavailability and help in developing more ecological risk estimates