This paper examines the determinants of rice-cultivation adoption in inland-valley bottom areas in Ghana. In West African countries, surging import of rice has shown farmers a new and potentially huge income source. Around the second largest urban area in Ghana, Kumsi, there are inland-valley bottoms which are suitable for rain-fed rice cultivation. The puzzle is that not much part of these inland-valley bottoms has been utilized for rice production. In 2001, in four villages around Kumasi, we conducted a detailed household survey both on lowland-rice and upland-maize farmers. We found that the profit from lowland-rice cultivation was significantly lower than that from upland-maize farming. This paper also examines our predictions made from the profit comparisons in 2001 survey by the results of rice-farmer census conducted in 2011 in the same four villages.