Unopened, commercially produced jam generally lasts for around 2 years at room temperature, stored away from light. However, the actual shelf life depends on the jam's sugar content.
Here's a more detailed breakdown:
- Commercial Jam: Typically lasts around 2 years. The high sugar content acts as a natural preservative. Look for a "best by" or "expiration" date on the jar.
- Homemade Jam: Homemade jam's shelf life can be shorter than commercially produced varieties because it might contain less sugar or be processed differently. It's essential to ensure proper sterilization of jars during preparation. Aim to use it within 1 year, stored in a cool, dark place.
- Low-Sugar Jam: Because sugar is a preservative, low-sugar or sugar-free jams may have a shorter shelf life than traditional jams. Check the product label for specific storage instructions and expiration dates. Refrigeration after opening is especially important.
Factors Affecting Shelf Life:
- Sugar Content: Higher sugar content generally translates to a longer shelf life.
- Acidity: Jams made with acidic fruits (like berries) tend to last longer.
- Storage Conditions: Store unopened jam in a cool, dark, and dry place to maximize its shelf life. Avoid direct sunlight or extreme temperatures.
Important Note: Even if unopened jam is past its "best by" date, it may still be safe to eat, provided it shows no signs of spoilage. Look for changes in color, odor, or texture. If you notice mold, a fermented smell, or a bulging lid, discard the jam immediately.
