Climate change has caused uncertainty of weather. It also threatens the household food security of farmers around the dam. The study purposed to determine: 1) the perception of climate change; 2) the farmers’ adaptation to climate change; 3) the factors affecting household food sufficiency in the climate change situation. The study was conducted at the Village Kedung Sumber, Bojonegoro Regency, Indonesia. The main data were obtained by interviewing the farmers’ families. Descriptive analysis and the structural equation model were used to analyze the data. The results showed that most farmers cultivated crops on the dam when the water is receding. The main crops cultivated were corn, chili, watermelon, and rice. Most farmers’ perceptions about climate change were the uncertainty of the weather, so it was hard to predict when the dam water is tidal or receding. In the climate change situation, farm production has decreased by an average of 20.9%. Some rice farmers even failed to harvest, and they switched to tobacco. Their efforts to adapt to climate change were changing the crops and starting cultivation earlier to avoid the dam from sudden floods. Their farm production and income were not enough for their food sufficiency. It needs support from the nonfarming income. The SEM results showed that the climate significantly affected farm production. Afterwards, farm production and non-farm income positively determined the food sufficiency. It was still dominated by carbohydrates, vegetables, and vegetable protein. The recommendation given is the assistance to farmers in adapting climate change.