The study on the “Extent of adoption of off-season vegetable cultivation by tribal farmers in Koraput district of Odisha” was conducted using Ex-Post-Facto research design. The study was conducted in the Koraput and Semiliguda blocks of Koraput district, Odisha, with a sample size of 120. The study used an ex-post facto research approach that combined random and purposeful sampling methods. While the gram panchayats, villages, and respondents were chosen at random, the district and blocks were purposefully chosen. The responses were obtained from each individual respondent through a structured interview schedule. Regarding adoption, the majority (75%) of off-season vegetable growers had medium adoption levels. With mean scores of 2.93, 3.00, 3.00, 2.87, 2.75, and 1.25 in regards to production, management, conservation, marketing, training, and capacity building, as well as supporting data, farmers have more adoption of land suitability, crop rotation, across-slope ploughing, input availability, discussion meetings, and crop insurance, respectively. To augment off-season vegetable production in the state in general and Koraput in particular, the latest proven and viable technology for off-season vegetable production needs to be diffused through various extension activities to accelerate its adoption. Again, the new, tried-and-true vegetable-growing techniques should be disseminated through several extension programmes to speed their adoption.