Governments have been noted to be the single largest purchaser in a national economy and the public procurement systems in low-and middle-income countries have typically been characterised by lack of transparency and inefficient public expenditures An E-procurement system offers many benefits which include: enhanced transparency and compliance, increased performance and quality. There is evidence of implementation challenges faced during its introduction in the year 2003. The general objective of this study was to determine the factors affecting the effective implementation of electronic procurement in the county governments in Kenya. This study adopted a descriptive approach. The target population was 40 employees of Kajiado County. The study used a semi structured questionnaire to collect data from the tender committee members. The study found that management support is very crucial in implementing eprocurement in the county governments, top management is so important because it acts as the driving be hide the whole implementation process. The study revealed that budgetary allocation affects the effective implementation of e-procurement. The study also found that budgetary allocation positively affects the effective implementation of e-procurement. The study found that staff competence affects the effective implementation of the e-procurement in the county governments. It was further revealed that staff competence and information technology infrastructure positively influence effective implementation of the e-procurement in the county governments, and concludes that the current information technology infrastructure is not effective enough to support the implementation of e-procurement in the county governments.