The main objective of the study was to investigate the factors that affect provision of career guidance services in public secondary schools based on Ginsberg Theory of career development which states that career guidance is developmental but is very significant during adolescence. Based on the study, this paper examines the nature of training given to teacher-counsellors to undertake their guidance and counselling work in secondary schools. The study was conducted using survey research design. The participants were teacher-counsellors from 10 public secondary schools in Ekerenyo Division, Nyamira North District, Kenya. A sample size of 30 teacher-counsellors was selected using stratified and simple random sampling techniques. Data was collected through the use of teacher¬-counsellor career guidance questionnaire. The collected data was analyzed using descriptive statistics: frequencies and percentages. The study found out that most guidance and counselling teachers had not received specialized training in guidance and counselling. It was therefore recommended that more teachers should be trained in guidance and counselling, especially in areas such as career guidance. The findings of the study are of great help to counsellors, teachers, parents, the whole community, curriculum developers and policy makers in education in developing programmes to strengthen the capacity of teachers to effectively undertake career guidance and counselling of students in schools.