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We investigate bioenergy production from farms under Canadian conditions. We couple an existing model of whole-farm greenhouse gas emission (CO2, N20 and CH4) to biofuel production sub-models. For different climate and soil conditions (i.e., eastern and western Canada), we estimate potential net-GHG reductions associated with changes in operational variables, such as tillage and fertilizer application. Lifecycle assessment used to access the short-term benefit and long-term viability of displacing petroleum fuel sources with bioenergy feedstocks provide contrasting results. Such assessment involves uncertain assumptions of present and future land-use conversion, bioenergy yield, energy production conversion efficiencies, and emissions from off-farm distribution and supply. We present results from farm-biodiesel coupled model scenarios. We compare results to assess the relative benefits of reducing GHG emission, alongside other potential farm ecosystem impacts - such as ability of soil to sequester carbon and removal of soil nitrogen that would otherwise aid in replenishing crops. Our goal is to provide more resolved estimates of the expected range in farm net-GHG to help improve the accuracy and reliability for full life-cycle assessments that include considerations off the farm.