Linseed production and productivity is constrained by weed infestation and unavailability of improved varieties in Toke Kutaye district. This experiment was carried out to identify better performing linseed varieties and determine the optimal weeding frequency. Field experiment was laid down in Randomized Complete Block Design (RCBD) with factorial combination of four weeding frequency (weeding check, one time weeding, two times weeding and three times weeding) and four improved linseed varieties (kuma,Yadano, Kulumsa-1, and Kasa-2) and one local check and was replicated thrice. Galinsoga parviflora, Cyperus esculantus L., Polygonum nepalensemeisn and Amaranthus graecizans L. were weed species with intensity of 1.1, 0.94, 0.16 and 0.07 respectively. Analysis of variance showed significant differences among the main effect of weeding frequency and varieties on phenological parameters such as days to 50% flowering, days to 50% capsule formation and days to 90% physiological maturity and on yield and yield components such as plant height, number of primary and secondary branches per plant, seed yield and biological yield. Days to 50% emergence has significant effect however, number of tillers per plant, stand count and straw yield were not significantly affected by the main effect of variety. Significantly higher seed yield (1175.5kg ha-1) was obtained from Kuma linseed varieties while the lower yield (532.5kg ha-1) was obtained from local check. Three times and two times weeded treatments produced significantly (P<0.01) higher seed yield per hectare (1259.4 kg ha-1 and 1197.8 Kg ha-1) respectively which was no significantly different followed by one times weeding (836.5 kg ha-1) while the lowest mean (512.8kg ha-1) obtained from weed check. Substantial 59% yield loss was observed among treatments when weeds were allowed to grow for the whole season. Seed yield correlated positively and highly significant association with number of tillers per plant (0.706), number primary branch per plant (0.775), number of seconder per plant (0.663), number capsule per plant (0.699), number of seed per plant (0.647), biological yield (0.848), straw yield (0.754), thousand seed weight (0.400) and harvest index (0.487). Cost benefit analysis revealed that 30733 ETB ha-1 with the net marginal profit of 18543 ETB ha-1 obtained from Kuma linseed variety with two times weeding was better to increases grain yield.