Nutmeg is a spice that can last for quite some time, although the timeframe depends on how you store it. If stored correctly, nutmeg should be good for up to five years from the date of purchase. In terms of open storage in your kitchen pantry or cupboard, whole nutmegs should last anywhere from six months to one year before their flavor decreases significantly. Ground nutmegs are more vulnerable and will only stay potent for about three months - after that point, their aroma and taste will begin to fade more quickly. To help extend shelf life, make sure your ground nutmeg is closed tightly after every use; this will also help preserve its potency as well as keep away any unwanted moisture or pests!