Sunflower Seeds

The main reason why sunflower seeds do not need to be refrigerated is because they have a low moisture content. Moisture is a key factor in causing spoilage and mold growth in food items. However, sunflower seeds have such minimal moisture that they are unlikely to attract any unwanted bacteria or fungi, even when stored at room temperature.
By refrigerating them unnecessarily, you run the risk of introducing unwanted condensation within the package, which can affect the quality of the seeds.