Importance of time resource management on academic performance of teacher-trainees in teacher training colleges cannot be over-emphasized. However, academic performance of teacher-trainees has been dismal and continues to be on a downward trend. The purpose of this study was to investigate the influence of time resource management on academic performance of trainees in public primary teacher training colleges in Kenya. The study was guided by time management theory. The study adopted mixed methods approach and thus applied concurrent triangulation research design. Qualitative data were analyzed thematically along the objectives and presented in narrative forms, whereas quantitative data was analyzed descriptively and inferentially using Chi-Square using Statistical Packages for Social Science (SPSS Version 23) and presented using tables and charts. The study established that physical, human, financial, instructional and time resource management do effectively influence teacher trainees’ academic performance in public TTCs in Kenya. The study concludes that time resources are important, but were inadequate to influence on trainees’ academic performance in public PTTCs in Kenya. The study recommends that PTTCs should adopt effective time management strategies to eliminate cases of time wastage.