Impacts of increased winter snowfall and warmer summer air temperatures on nitrous oxide (N₂O) dynamics in arctic tundra are uncertain. Here we evaluate surface N₂O dynamics in both wet and dry tundra in West Greenland, subjected to field manipulations with deepened winter snow and summer warming. The potential denitrification activity (PDA) and potential net N₂O production (N₂O_net) were measured to assess denitrification and N₂O consumption potential. The surface N₂O fluxes averaged 0.49 ± 0.42 and 2.6 ± 0.84 μg N₂O–N m⁻² h⁻¹, and total emissions were 212 ± 151 and 114 ± 63 g N₂O–N scaled to the entire study area of 0.15 km², at the dry and wet tundra, respectively. The experimental summer warming, and in combination with deepened snow, significantly increased N₂O emissions at the dry tundra, but not at the wet tundra. The deepened snow increased winter soil temperatures and growing season soil N availability (DON, NH₄⁺-N or NO₃⁻-N), but no main effect of deepened snow on N₂O fluxes was found at either tundra ecosystem. The mean PDA was 5- and 121-fold higher than the N₂O_net at the dry and wet tundra, respectively, suggesting that N₂O might be reduced and emitted as dinitrogen (N₂). Overall, this study reveals modest but evident surface N₂O fluxes from tundra ecosystems in Western Greenland, and suggests that projected increases in winter precipitation and summer air temperatures may increase N₂O emissions, particularly at the dry tundra dominating in this region.