Heavy whipping cream typically lasts about 7 to 10 days after opening when stored properly in the refrigerator at or below 40°F (4°C). Some sources suggest it can remain good for up to several weeks or even a month if kept consistently cold and unopened, especially if it is ultra-pasteurized, but once opened, the safer guideline is about one week

. Key points for storage and freshness after opening:

• Store heavy cream in the coldest part of the fridge (back or bottom shelf).
• Keep the container tightly sealed to avoid exposure to air and contaminants.
• Ultra-pasteurized cream can last longer unopened but still about 7 days after opening.
• Signs that heavy cream has gone bad include sour smell, curdling, lumps, or thickening

In summary, after opening, heavy whipping cream should be used within about 7 days for best quality and safety, although it may last slightly longer if stored very well and checked carefully for spoilage signs.