Look for tangerines that are bright orange with very few, if any, green patches. The all-around orange color usually is a sign the fruit had time to ripen properly on the tree.
Squeeze several tangerines gently for comparison. Pick the tangerines that feel plump and juicy, both signs of ripeness. Avoid tangerines that feel hollow or dried because these are signs that the fruit didn't fully ripen on the tree. Use the same size tangerines for the best comparison.
Feel the skin of the tangerine. It should be slightly loose. The looseness is a sign of ripeness and gives the tangerine its reputation as an easy-to-peel fruit.
Buy a single tangerine for a taste test. If it tastes juicy and sweet, it's ripe. Return to the display and select tangerines that were nearby because they most likely came from the same shipment.
Avoid any tangerines that have brown spots or mushy soft spots. These tangerines are likely over-ripened.