Raw mushrooms typically last between 3 to 7 days in the fridge when properly stored. Cooked mushrooms generally last about 3 to 4 days in the refrigerator. Whole raw mushrooms last longer than sliced ones, with sliced mushrooms lasting 1 to 2 days in the fridge. For the longest shelf life, mushrooms should be stored in a paper bag or other container that allows airflow to prevent moisture buildup and spoilage. Avoid plastic bags or sealed containers, as they trap humidity and accelerate spoilage. The fridge temperature should be kept between 35–40°F (1.5–4°C) for optimal freshness. Mushrooms showing signs of sliminess, discoloration, or off-smell should be discarded. Freezing cooked mushrooms is an option for longer storage, but raw mushrooms are best used fresh or frozen after cooking.