Quantifying moss resistance to evaporation is important for estimating boreal peatland evaporation. However, little discussion is in the literature on the physical meaning of peatland moss resistance. Furthermore, the boreal region is subject to increasing wildfire risk, where peatland burning and subsequent carbon losses can be large. Resistance to evaporative losses can influence peatland burn susceptibility. High resistance reduces evaporative losses, maintaining wet surface conditions, whereas low resistance can increase evaporative losses, drying the moss and increasing burn susceptibility. Seasonal Ground Ice (SGI) complicates this process, as it often forms within the 10-30 cm layer of the surface moss. SGI melts during the spring, releasing water in the near surface moss layer, promoting wetter conditions, lowering the risk of peatland burning. Yet, if evaporation exceeds the melt rate, the moss above the SGI can dry out, due to SGI blocking additional water inputs from below. Anecdotal reports of both situations occur in the literature, but it has yet to be fully explored. Given the increasing wildfire risk and uncertainty in a peatland response (i.e. fire break, fire fuel), it is important to quantify peatland moss resistance, elucidating the complex interactions between moss resistance, SGI and evaporation. The research objectives are to; (1) Review reported moss resistance values across different sites and (2) Quantify peatland moss resistance in the presence of SGI, assessing its burn susceptibility. Constraining peatland moss resistance is integral to better represent peatland evaporative processes in ecohydrological models and improve our understanding of peatland wildfire risk.