A small-plot study was conducted at the Canada-Saskatchewan Irrigation Diversification Centre (CSIDC) to assess soil-emitted nitrous oxide (N₂O) emissions in irrigated and non-irrigated plots seeded to spring wheat. The CSIDC is situated at Outlook, SK which is in the north-central portion of the semi-arid Northern Great Plains Ecoregion in the Dark Brown Soil Zone. Vented non-steady state flux chambers were utilized and N₂O concentrations from headspace samples were determined using gas chromatography. Three different nitrogen (N) fertilizer regimes were implemented. Together with a no N reference treatment, N was applied at a rate of 120 kg ha^-1 in the fall (October) or at seeding in the spring (May). Nitrous oxide emissions responded to both fertilizer application and irrigation. N₂O emissions in this region are typically high early in the spring due to high soil-water contents following snowmelt. The combination of high soil-water contents and nitrate from fertilizer application the previous fall led to very high emissions in plots receiving fall-applied N during this time period, but lower emissions for the remainder of the year. Emissions in plots receiving spring-applied N had lower emissions following snowmelt, but more intense emissions following fertilizer application. In general, irrigated plots produced higher annual cumulative emissions.