Check the color: most ripe limes are bright green to yellow-green, depending on the variety
Gently squeeze it: a ripe lime should feel slightly soft but not mushy
Look for a smooth, glossy skin
Avoid limes with hard, dry, or wrinkled skin
Smell the stem end: a ripe lime often has a strong citrus aroma
Pick one that feels heavy for its size
If it gives slightly to pressure, it is usually ripe
If it is very firm and pale, it is likely underripe
If it is overly soft or has brown spots, it may be overripe