Once Cut butternut squash will last in the freezer for 3 to 4 months before going bad if you store it properly in their right conditions necessary in the freezer. Bacteria grow rapidly at temperatures between 40 F and 140 F. Pin On Foods If you want to get the squash ready for cooking ahead of time cut or chopped butternut squash can last for about 3 to 4 days in the fridge. How long is squash good in the fridge . Zucchini once cut lasts on the counter for 7 to 8 hours before going bad if you store them properly in their right conditions necessary on the counter. Properly stored cooked winter squash will last for 3 to 5 days in the refrigerator. Upon refrigerating the winter squash it can last up to 1-2 months easily. Cooked spaghetti squash will keep for three to five days in the fridge or 10 to 12 months in the freezer before spoiling. On the other hand summer squash can last up to 5-7 days when you keep it in the refrigerator. Correspondingly how long is cut squash good...