A popular sweet pepper variety ‘California Wonder’ was evaluated under different protective structures in two consecutive seasons of 2008-09 and 2009-10 at the experimental field of Horticulture Research Center (HRC) of Bangladesh Agricultural Research Institute (BARI), Gazipur. Protective structures had remarkable and significant influence on plant growth and yield of the sweet pepper. The plants grown under tunnel cover with polythene and nylon net or tunnel cover with only nylon net had higher plant height compared to that of plants grown in open field. In both of the seasons the highest individual fruit weight (76.13g and 73.71g, respectively) was recorded from the plants grown under tunnel cover with polythene and nylon net while it was the lowest from open field grown plant (45.44g and 48.2g, respectively). The highest number of fruits per plant was recorded in both seasons from the plants grown under tunnel cover with polythene and nylon net and it was closely followed by tunnel cover with only nylon net. The maximum fruit yield per plant (550.1g) was recorded in 2009-10 from tunnel cover with polythene and nylon net which was followed by tunnel cover with only nylon net (439.58g). The lowest per plant fruit yield was obtained from the crop grown in open field (125.1g) indicating brighter scope for sweet pepper cultivation under protective structures.