The study investigated the Impact of Learning Environment on junior secondary school students' performance in Civic Education in Kogi State, Nigeria. The study was carried out to: determine the impact of learning environment on students' performance in civic education in urban and rural junior secondary schools in Kogi State; ascertain the impact of class size on the performance of students in civic education in junior secondary schools in Kogi State; examine the impact of learning materials on students' performance in civic education in junior secondary schools in Kogi State; and determine the impact of learning environment on the performance of male and female students in civic education in junior secondary schools in Kogi State. In line with the above stated objectives, four (4) corresponding research questions and four (4) hypotheses were formulated and tested for the study. The study adopted ex-post facto research design. The total population of the study comprised 10,295 students, out of which a sample size of 375 respondents was used for the study. The instrument tagged Learning Environment and Students' Performance Questionnaire (LESPQ) and students' End of term examination scores were used to obtain data for the study. The instrument was pilot-tested and a reliability coefficient of 0.85 was obtained. Data collected were analyzed statistically using descriptive statistics which include mean and standard deviation, while inferential statistics of t-test was used to test the formulated hypotheses at 0.05 level of significance. Findings revealed among others that learning environment have impact on students' performance in civic education in urban and rural junior secondary schools in Kogi State and class size have impact on performance of students in civic education in junior secondary schools in Kogi State. In view of the findings from this study, conclusion was made that unconducive learning environment has negative impact on students' academic performance. In addition, a good school location with accessible road, good field of play, neat toilet and large classroom with lighting and library stocked with up-to-date textbooks have positive impact on students' performance. Recommendations were made among others that Kogi State government should make secondary schools in the state more conducive for learning by providing facilities such as up to date text books, teaching aid, good playing field, resource person and neat toilet. Adequate classrooms should be provided with chairs and desks to correspond with the yearly increase of students' enrolment