A measurement scheme of social welfare effects (consumer surplus + producer surplus) associated with agricultural outlook information program, which has been active since 1999, was developed. Applying this scheme, we were able to identify a significant amount of positive social welfare effects of agricultural outlook information. Specifically, we found that the social welfare effects of agricultural outlook information of 14 major agricultural products was 128.8 billion Korean won in 2006, of which consumer surplus is estimated to be 71.6 billion Korean won and producer surplus is estimated to be 57.2 billion Korean won. Recognizing that these estimates are the maximum amount of ex-ante social welfare effects in the sense that all producers adopt outlook information so that an equilibrium of supply and demand can be obtained, we discount this benefit by using a real adoption rate (23.2%). After this discount, the ex-post value of agricultural outlook information of 14 products is estimated to be 52.8 billion Korean won.