Tomato production in Ethiopia is mostly practiced during the off season using irrigation. During the rainy season, its production is limited due to high incidence of fungal diseases. The market supply of tomatoes during the rainy season is therefore limited and drives the prices to unaffordable high level. Recently, however, smallholder farmers are using Polyhouse technology that protects tomatoes from rain and thus reduces the incidence of diseases, especially that of late blight. Therefore, a field experiment was conducted at Koga Irrigation Scheme to evaluate the growth and yield performance of hybrid tomato varieties and economics of polyhouse structures during the rainy season. Accordingly, three hybrid tomato varieties (Galilea, Gabbi and Galilea-39) were grown under polyhouse during the 2022 rainy season in four replications at Koga Irrigation Scheme, which were arranged in Randomized Complete Block Design (RCBD). Data on growth, phenology, yield and quality parameters of tomato were collected and analyzed using the SAS-9.4 software. According to the results significant differences among the three hybrid tomato varieties were observed for most of the growth parameters and yield components in each location. Gabbi variety recorded the tallest plant height (174.84-180.54 cm),more number of primary branches (8.91- 9.72) and secondary branches (17.30-19.32), the highest number of flower cluster (29.75- 34.45), flower per cluster (6.86-7.36), fruit per cluster (5.29-6.01), fruit set percentage (72.64-84.10%), marketable yield (90.75-103.07t/ha) and total yield (92.20-104.31 t/ha) in all locations except in Kudmi. Combined over locations Gabbi variety recorded the tallest plant height (174.63 cm), more number of primary branches (8.60) and secondary branches (17.61), the highest number of flower clusters per plant (29.17), number of flowers (6.68) and number of fruits per cluster (5.00), the longest fruit length (6.83cm), the highest marketable yield (89.11 t/ha) and total fruit yield (90.32 t/ha).Financial feasibility of the polyhouse also showed that net present value of producing tomatoes in the polyhouse with 18% discount rate was non-negative (4,135.27ETB per 140m2 area); the benefit to cost ratio was 1.25 and the internal rate of return was 24% at 18% interest rate. Accordingly, the production of tomato in a polyhouse structure is highly feasible and profitable where the variety Gabbi could be recommended for the production of tomato at Koga Irrigation Scheme and similar agroecology. Further researches on fertilizer optimization and disease and insect pest management options are suggested.