The deployment of the right innovative technologies to government organizations can provide competitive advantages to the citizens. Cloud computing (CC) is an emerging and transformative technology that offers IT services as utility online. Collaborating to its vital features total cost reduction, increase of productivity and scalability are the top motivators to adopt CC. Prior research works show that before rushing to adoption, organizations must assess their readiness at least once. But as studies show many, including Ethiopia, adopt technologies without considering readiness study – the key step. Readiness study is a must to reduce or avoid risk of wastage and/or failure. Moreover, several research works are more focusing on an individual or a firm level theoretical model using either quantitative or qualitative approach. However, research works on cloud readiness assessment model for e-government (e-gov) services are insufficient, particularly for developing countries. In Ethiopia there is not a cloud readiness study on e-gov services. The purpose of this study is to design a cloud adoption readiness assessment model (CARAM) that fits to the context of the National Data Center of Ethiopia (NDCE) based on the empirical study of factors affecting adoption of CC to e-gov services with mixed methods. The mixed approaches increase the reliability of the result of the study. A total of 78 respondents from seven government organizations responded for the questionnaires and the collected data was analyzed with SPSS tool. Furthermore, the data collected from interview of twelve senior IT experts of the Ministry of Innovation and Technology (MInT) and document analysis were analyzed using thematic technique. Besides, the performance of Internet and the IT infrastructure of the NDCE were observed. The status of NDCE to adopt CC to e-gov services is low. Moreover, poor connectivity, inconsistency of power supply and lack of CC knowledge to users are identified as barriers though some enabler factors. Accordingly, the CARAM has proposed as a solution to help assessing readiness of NDCE to adopt CC to its e-gov services, since there is nothing earlier. Subsequently, the proposed model was evaluated twice: firstly, it was evaluated by senior IT experts of the NDCE for refinement and it was improved according to the comments provided. Secondly, the improved model was evaluated for confirmation, and it is highly (90%) accepted. Keywords: cloud adoption, e-gov services, mixed approaches, national data center, readiness assessment model