Thermal acclimation represents a key process enabling ectotherms to cope with changing environmental conditions, including climate change or biological invasions. Intraspecific variations in thermal acclimation may reflect adaptation to locally prevalent environmental conditions. Environmental gradients can provide useful models to study such processes. Here, we compared the thermal acclimation capacity of the invasive common periwinkle Littorina littorea, along a large latitudinal gradient. Specifically, we exposed adult snails collected from 10 different locations along Atlantic North America to 12 temperatures (5 to 27 C) and measured survival, feeding rate, growth, metabolic rate and Ctmax. Our results showed that latitude, average summer temperature, and growing season length at the place of origin influenced snails’ thermal responses. In particular, snails from higher latitudes showed a higher capacity for acclimation, with increasing CTmax and feeding performance at higher temperatures. Furthermore, survival underwent a steeper decrease towards higher temperatures for snails from lower latitudes, showing they possess a better acclimation capacity in colder locations. In addition, growth and metabolic rate curves presented differences among snails from different locations. In conclusion, feeding, CTmax and survival results were coherent with a counter-gradient adaptive scenario. Low-latitude individuals may be lacking acclimation capacity because they already live near their thermal limits, while higher latitudes individuals may possess higher acclimation capacity to better exploit the shorter periods of warm temperatures they experience. Whereas growth and metabolic rate results indicate the presence of potential local adaptation, especially at the distribution edges, characterised by harsher conditions.