Does Garlic Go Bad?

Yes, garlic does go bad, but its shelf life depends heavily on how it's stored and whether it's peeled.

Whole, unpeeled heads: These can last for about six months if stored properly in a cool, dark, and dry place. Source
Unpeeled cloves (separated from the head): These will stay fresh for approximately three weeks. Source
Peeled cloves: Once peeled, garlic should be used within one week, ideally stored in the refrigerator. Source
Minced garlic: Minced garlic should be refrigerated and used quickly, ideally within a day. Leaving it out at room temperature greatly increases the risk of botulism. Source

Signs of Spoilage

Several indicators reveal that garlic has gone bad:

Soft and pliable texture: A fresh garlic bulb will be firm and hard. Softness indicates spoilage. Source
Discoloration or rotting: Yellowing or the presence of mold or dark patches signifies that the garlic is no longer good. Source
Sprouting: While sprouting doesn't necessarily mean the garlic is bad, it indicates that it's losing its potency and freshness. Source
Unusual smell: A foul or off-putting odor is a clear sign that your garlic has spoiled. Source

Important Note: Garlic stored in olive oil presents a risk of botulism if not properly handled and stored. Source