Brewed coffee is just as prone to growing mold as regular coffee beans, which are grown in a warm, moist environment. While the hot temperatures that are used to brew coffee will keep mold away initially, the longer that brewed coffee sits after brewing, the more likely the beverage is to grow mold.

Does instant coffee go Mouldy?

Yes, instant coffee can go bad. ... While instant has a much longer shelf life than regular ground coffee, it can still go bad and even develop mold if it's not stored properly. If it's a single-serve pouch, it can last a long time as long as it stays closed.

How long does it take for coffee to mold?

Molds and bacteria may start to appear. If left to sit out for long enough, brewed coffee will eventually start to grow mold. This usually happens after 4 to 7 days after brewing if the coffee is left at room temperature.