Currently there is very limited information comparing the economics of Brassica juncea canola, and sunflowers to Brassica napus canola and flax across Saskatchewan using current production practices. Differences in response to nitrogen fertilizer will affect the economics of these crops. Therefore a study was carried out with four crops, eight nitrogen rates, and 5 locations, Indian Head, Swift Current, Scott, Melfort and Redvers, SK in 2004, 2005 and 2006. There was a response to the addition of nitrogen fertilizer at 10 out of 13 site-years while 2 site-years were lost to hail. At 7 of the 10 site-years the crops responded to nitrogen fertilizer in a similar manor. Over most sites and years Brassica napus had the largest and most consistent response to nitrogen of the four oilseed crops in this study. At only 1 out of 13 site- years was there a higher yielding crop, flax, than Brassica napus. Brassica napus out yielded flax at 4 out of 13 site-years. Sunflower was only the highest yielding crop at one site-year and Brassica juncea was never the highest yielding crop. In this study, Brassica napus and flax were more consistent than sunflower and Brassica juncea.