When unopened, canola oil can last up to two years if stored in a cool, dark place. The “best by” date on the label is a good guideline, but it doesn't mean the oil becomes unsafe immediately after that date. If unopened, it’s often safe to use for several months beyond this date.

Once opened, the shelf life of canola oil decreases significantly. It typically lasts around 6 to 12 months. After opening, exposure to oxygen and heat can accelerate the oil's degradation. Therefore, proper storage is crucial to prolong its freshness.

Recognizing the signs of spoiled canola oil is essential to avoid ruining your dishes. Here are some indicators that your canola oil may have gone bad:

Rancid canola oil often has an off-putting odor. If it smells like crayons, paint, or has a sour scent, it’s likely spoiled.

Fresh canola oil should be clear and light yellow. If you notice it turning brown or black, this is a sign of spoilage.

If the oil tastes sour or has any strong flavor other than its usual neutral taste, it’s best to discard it.

Using canola oil past its expiration date is generally safe if it has been stored properly and shows no signs of spoilage. However, the quality may not be as good, and the flavor might be compromised. If you’re unsure, performing a smell and taste test can help you make a decision.

To maximize the shelf life of your canola oil, follow these storage tips:

Keep it Cool: Store canola oil in a cool, dark place, away from heat sources such as stoves or direct sunlight.
Seal Tightly: Ensure the bottle is tightly sealed to minimize exposure to air.
Refrigeration: While not necessary, refrigerating canola oil after opening can help preserve its freshness, especially if you live in a warm climate.
Avoid Freezing: Freezing canola oil is not recommended as it can alter its texture and quality.

In summary, canola oil does go bad, but with proper storage and handling, you can extend its shelf life significantly. Always check for signs of spoilage before using it, especially if it’s past its expiration date. By being mindful of how you store and use canola oil, you can ensure that your dishes maintain their flavor and quality. Whether you’re frying, baking, or sautéing, keeping your cooking oil fresh is key to culinary success.