When practicing clean eating and managing wholesome fats in your kitchen, keeping proper storage timelines in mind is essential. Strained bacon grease stored in a clean glass jar on your kitchen counter will generally remain safe and usable for about one month. Because animal fats are relatively stable when fully rendered, they do not spoil instantly, though ambient room temperatures can eventually cause oxidation. To maintain optimal macro balance and flavor integrity for your home cooking, it is best to use it within that initial four-week window. However, ensuring you strain out any leftover meat particles is critical to prevent premature rancidity.