In cold regions, snowmelt is an important source of groundwater recharge and spring streamflow. However, in a warming climate the factors governing snowmelt recharge dynamics are expected to change. This study investigates the effectiveness of snowmelt versus rain in recharging groundwater under future climate conditions in the Christmas Brook watershed, Eskasoni First Nation, NS, where the local community relies on groundwater as a potable water source. We monitored hourly precipitation, snow depth, groundwater level, soil moisture and temperature, and streamflow across three landscape types at differing topographic positions. We used field observations to calibrate the Simultaneous Heat and Water (SHAW) model, a one-dimensional critical zone model that simulates coupled heat and water transport through canopy, snow, and soil, including freeze-thaw processes. Simulations were run over historical, mid-century, and end-of-century periods to quantify differences in recharge between rain versus snow recharge events under climate change. Preliminary results indicate snowmelt historically makes up a significant proportion of groundwater recharge. However, recharge events occur year-round from a combination of snowmelt and rainfall. By the year 2100, simulated snowpack depth declined 40% on average from historical observations. Additionally, the annual number of days with snow cover reduced to around one third of the historical count. Overall, evolutions in snow cover and melt patterns, and soil ice content, shifted recharge dynamics in the watershed. The results illustrate the complex mechanisms controlling groundwater recharge in cold regions and the utility of modelling to understand how decreases in snow and increases in rain will impact groundwater resources.