- How long does an unopened bottle of Madeira last? The answer to that question is a matter of quality, not safety, assuming proper storage conditions - when properly stored, an unopened bottle of Madeira has an indefinite shelf life.
To maximize the shelf life of Madeira for quality purposes, store in a cool dry area away from direct heat or sunlight.
How to tell if Madeira has gone bad? The shelf life of unopened Madeira is indefinite but if Madeira develops an off odor, flavor or appearance, it should be discarded for quality purposes.
Sources: For details about data sources used for food storage information, please click here