In order to evaluate agricultural knowledge of cumin growers in Sabzevar , a survey was conducted for 150 cumin growers. Dependent variables were allocated to the level of their knowledge in three phases of planting , crop management, harvesting‌, and the extent they benefit from extension services‌, age, level of education, farming experiences and size of family were the independent variables‌. Results showed that only 18 % of the farmers were knowledgable In farming practices and methods of irrigation and fertilizer application contributed the highest rank‌, while processing and packing the products shared the lowest rank. There was a positive correlation between the level of education and all dependent variables (‌at 5% level‌)‌. There was no correlation between the size of family and the level of knowledge, and young farmers were more knowledgable in farming practices compared with the olders. Role of extension services in promoting these knowledge particularly in planting‌, and diseases control was significant‌. However such role was not effective in harvesting and processing .