The importance of non-growing season greenhouse gas fluxes to annual budgets in pristine northern terrestrial ecosystems is growing in awareness. Greenhouse gas (GHG) fluxes during the non-growing season and freeze-thaw dynamics are still underrepresented and may be a reason why current process-based models predict inadequate annual methane (CH4) and nitrous oxide (N2O) budgets. FluxWIN is therefore investigating ecological and biogeochemical processes in global carbon (C) and nitrogen (N) cycles during the non-growing and shoulder seasons by combining high-frequency greenhouse gas measurements, biogeochemical monitoring and process-based modeling. Siikaneva, nearby Hyytiälä Research Station in boreal Finland, is an ICOS-certified site and well situated within long-term scientific infrastructure to compare and combine high-frequency greenhouse gas measurement techniques and investigate freeze-thaw dynamics. An automated static chamber technique is used with inline laser gas analysis to obtain soil-atmosphere CH4 and N2O exchange in real time. Additional automated sampling of diffusion tubing will sample soil gas concentrations in the same analytical system. We control for climatic variability and isolate differences in non-growing season emissions by using a moisture gradient from well-drained upland soils to adjacent wetland ecosystems. The use of these automated high-frequency GHG measurements in combination with year-round biogeochemical monitoring maximizes the likelihood of capturing episodic emissions and their drivers, which are particularly important during fall freeze and spring thaw periods. The gained information on ecosystem function and biogeochemical cycles for temperate, boreal, and arctic regions will improve feedback estimates to climate change by including non-growing season processes in global-scale process-based models.