The study examined the factors affecting the effectiveness of strategic planning in the public primary teachers' training colleges in Kenya. Specifically, the study sought, to establish the extent of adoption of formal strategic planning in the public primary teachers' training colleges in Kenya, to investigate the effect of performance contracting on strategic planning effectiveness in the public primary teachers' training colleges in Kenya, to examine the extent to which monitoring and evaluation is a challenge to effective strategic planning in the public primary teachers' training colleges in Kenya and lastly, to determlne the interventions necessary to enhance strategic planning effectiveness in the'public primary teachers' training colleges in Kenya. The study was to benefit various stakeholders, mainly, the government planners and policy makers, the private sector managers, donors, educational managers, the academic fraternity and the communities. Although the public primary teachers' training colleges are important in the education system and national development; little research has been done on the factors affecting the effectiveness of strategic planning in these colleges. To carry out the research, a descriptive survey design was adopted. A sample of six public primary  eacher training colleges in the Nairobi and Central Zones were selected through purposive sampling. The population of interest was the top and middle level management cadre of six public primary teachers' training colleges. Data collection was by means of questionnaire and was analyzed using descriptive statistics and frequency analysis.