Abstract: This paper is mainly assessing project planning and its success in local government of Rwanda with a case study of Watershed Management Project (KWAMP), in Kirehe District. The specific objectives were assessing the influence of project budgets in planning process on project success, determining the influences of project human resources and manager’s competencies in project planning on project success, and analyzing the contribution of respecting project timelines in project planning process on project success of Watershed Management Project in Kirehe District. Methodology used in research design are descriptive research design, and target population of 100 people with a sample size of 80 respondents. Data are collected using questionnaires and documentary review while data were analyzed using SPSS as analysis software, descriptive statistical method and correlation coefficient.