Cauliflower mashed potatoes safely last five to seven days in the fridge and six to eight months in the freezer. Storing the mashed potatoes in a tightly sealed container helps to promote freshness and keep out excess moisture.
An excellent suggestion for leftover mashed potatoes is making potato pancakes, a simple recipe made with milk, eggs, spices and cheese. Cauliflower mashed potatoes start to become inedible when the liquid starts to separate from the solid in the container. Keep in mind if the cauliflower is cooked by itself, it has a much longer fridge life of seven to 10 days.