Does unopened yellow tail chardonnay go bad?

Yes, unopened yellow tail chardonnay will eventually go bad. Although wine doesn't spoil in the same way other beverages like milk do, it will continue to oxidise over time which can change its taste and quality. Most unopened bottles of Yellowtail Chardonnay will last for about 2-3 years before the quality begins to decline significantly. However, if the bottle has been exposed to extreme temperatures or light levels, the quality may diminish more rapidly.