What To Store In A Root Cellar Vegetable Ideal Storage Temperature (F) Relative Humidity (percentage) Average Storage Life Beets 32 95 1-3 months Cabbage 32 90-95 3-4 months Carrots 32 90-95 4-6 months Celery 32 90-95 2-3 months Garlic 32 65-70 6-7 months Horseradish 30-32 90-95 10-12 months Jerusalem artichoke 31-32 90-95 2-5 months Onions 32 65-70 5-8 months Parsnips 32 90-95 2-6 months Potatoes 38-40 90 5-8 months Pumpkins 50-55 70-75 2-3 months Rutabaga 32 90-95 2-4 months Sweet potato 55-60 85-90 4-6 months Turnips 32 90-95 4-5 months Winter squash 50-55 70-75 3-6 months