Understanding the soil resource in an area and adoptions of management options to improve the productivity of crops and soils is necessary for sustainable use. Vermicompost, which is a potential soil fertilizer for sustainable agriculture has proven to increase yields of a variety of crops, but little is known about its application rate and timing for optimum productivity of tomato in clay loam soils of Wondo Genet, Ethiopia. To evaluate vermicompost on tomato productivity, a field experiment was conducted at Wondo Genet Agricultural Research Center. Factorial combination of N rates from vermicompost (based on N equivalence) and application period was the treatments. Nitrogen rates was had levels of full dose from inorganic N, 50% of the RN from vermicompost, 75% of the RN from vermicompost, 100% of the RN from vermicompost and 150% of RN from vermicompost. Application period had levels of 35, 20 days before planting and at planting. The design was used RCBD with three times replication for each treatment. The obtained results from the present research indicated that, the application rate and timing of vermicompost, clearly, had influences on tomato productivity. Application of vermicompost had significant (p < 0.01) effect on tomato above ground biomass and tomato yield, but not on plant height and fruit diameter.