The study investigated the assessment of the impact of infrastructural facilities on students? performance in Social Studies in Federal Government Colleges in Niger State, Nigeria. Six objectives were raised to guide the study, among which are to: determine assessment of the impact of provision of adequate classrooms environment on students? performance in Social Studies; determine assessment of the impact of provision of adequate hostel facilities on students? performance in Social Studies; and examine assessment of the impact of library facilities on students? performance in Social Studies in Federal Government Colleges in Niger State, Nigeria. Six corresponding research questions and hypotheses were all stated in line with the objectives of the study. The study adopted ex-post facto research design and out of the total of 5 principals, 80 Social Studies teachers and 3254 students of Federal Government Colleges totalling 3339, a sample size of 351 respondents was used for the study. This comprised 4 principals, 41 teachers and 306 students. This sample size was arrived at using simple random sampling technique. A validated structured questionnaire and students? recorded scores in Social Studies was used as instrument for data collection in the study. The instrument was pilot-tested and a reliability coefficient of 0.78 was obtained. Data collected were analysed statistically using descriptive statistics which include mean and standard deviation to answer the research questions, while non-parametric statistics of Kruskal-Wallis was used to test the formulated hypotheses at 0.05 level of significance. Findings among others revealed that provision of adequate classrooms environment has positive impact on students? performance in Social Studies. Provision of adequate hostel facilities has positive impact on students? performance in Social Studies. Finding also revealed that library facilities have positive impact on students? performance in Social Studies in Federal Government Colleges in Niger State, Nigeria. The study concluded that provision of neat and attractive classroom environment with well equipped modern chairs, tables, ceiling fan, lighting, learning facilities, constant supply of light, water and maintenance of toilets in the hostels have positive impact on students? performance. Recommendations were made that Federal Ministry of Education , Non Governmental Organization, P.T.A should put more effort in providing more classrooms facilities, replace the old desk with new in these schools, Ministry of Educaiotn who are responsible in providing most of the funds in these Federal Government Colleges together with the principal, community leaders, students should establish criteria or teachers indicators for evaluating the condition and level of maintenance of laboratory facilities on regular basis