Agricultural innovation systems’ thinking has been adopted in agricultural research and development to harness the actor innovative capabilities, knowledge enhancement and social transformation. Hence there is growing recognition of the viability of Innovation platforms (IPs) as an approach to stimulating development of agricultural enterprises due to their emphasis on value chain development, networking and partnerships. However, despite the key role of the formation process in realization of desired outcomes, there is insufficient knowledge on how to form vibrant agricultural innovation platforms under diverse contexts. This study sought to examine the gaps and draw lessons for effective IP formation using the case of the coffee IPs in the four districts of Luwero, Ntungamo, Bushenyi and Rakai in Uganda. Data were collected through key informant interviews with 32 actors of the coffee steering committees and from document review. Qualitative data analysis was conducted using content and thematic analysis. Gaps identified in the IP formation processes included exclusion of some key stakeholders, unclear management and financing mechanisms, and weak governance structures at lower levels. To enhance legitimacy of innovation platforms, the study recommends a formation operational model with four main components of actor identification and mobilization, visioning and strategy formulation process, IP culture and development of governance structures.