This study explored the impact of agricultural extension services on cereal production. Data were collected through a semi-structured questionnaire from a random sample of 262 farmers from four regions (east, west, north, and south) in Bhutan. Farmers assessed the impact of extension services on five aspects of cereal production (cereal seed, social, environmental, production, and marketing aspects). Percentages and an ordered logistic model were used to analyse the data. The study found a low level of farmers’ participation in extension services. The social aspect of cereal production was the most impacted by the extension programmes, while the marketing aspect was the least impacted. The farmers’ cultivated dry land (Coeff. = 0.21) and wetland (Coeff. = 0.72), their participation in extension services (Coeff. = 0.61), and the extra labour (Coeff. = 0.24) significantly contributed to cereal production. The provision of effective and high-quality extension programs by extension agents is critical for smallholder farmers to enhance their agricultural production.