Shredded cheese will last for 5 to 7 days once opened.
Once you open a bag of shredded cheese it should be sealed back up and kept refrigerated to prevent spoilage.
When kept in the refrigerator and sealed in the bag the shredded cheese should be good for about 7 days.
If you want to keep the shredded cheese longer than 5 to 7 days after opening it you can freeze it.
However the texture and taste of the shredded cheese can change when frozen but it's not noticeable when the cheese is melted on foods or used in baked goods.
When shredded cheese goes bad it will usually begin to mold and may even smell bad.
If you notice those things with the shredded cheese then it should be thrown out.
Once the package is opened, consume or freeze the shredded cheddar cheese within the time shown for refrigeration, even if the "Best By," "Best if Used By," or "Use By" date has not yet been reached.
Shredded Cheese is made of pasteurized milk, cheese culture, salt, enzymes (used to separate milk into a solid curd), and any other added ingredients for flavor—like red and green jalapeno peppers in a classic block of pepper jack.
Shredded cheese is generally used as an ingredient.
It is mixed in with other ingredients or used as a topping for foods such as salads, sandwiches, soup, pizza, lasagna, and many other savory dishes.