Storing bananas correctly can extend their freshness and prevent them from ripening too quickly. One expert recommends finding a cool, dry spot away from direct sunlight and heat. Temperatures around 58°F (14°C) will help slow ripening. Plastic bags that restrict the diffusion of respiratory gases, like Breatheway Clearly Fresh bags, can also be used to create a modified atmosphere. However, this method should be used with caution as the atmosphere can become too extreme and trigger fermentation. Bananas ripen quickly due to their high ethylene production, a hormone that jumpstarts the ripening process. By controlling the temperature and exposure to ethylene, you can keep your bananas yellow and ripe for longer.