Permafrost soils in Arctic have recently shown unfrozen soil portions in winter, which can increase soil biogeochemical connectivity. This winter connectivity is mainly present if the system is open (unfrozen soil portions are connected) than if the system is closed. However, only few studies have focused on the differentiation of these systems. Here, we investigate δ30Si and redox-sensitive element (e.g., Fe) concentrations in soil pore water collected from September to November 2021 on a natural gradient of permafrost degradation from a palsa (closed system) to a fen (open system) in Stordalen, Sweden. We compare the evolution of the δ30Si values in soil pore waters where freeze-up has occurred (closed system) or where freeze-up is delayed or absent (open system). We couple our δ30Si data with variations in redox-sensitive element (e.g., Fe) concentrations, sensitive to limited biogeochemical connectivity in a closed system. The dual-approach of silicon isotope geochemistry with redox sensitive element analysis has important implications for capturing the lateral transfer of water and nutrients from permafrost soils during winter months.