In Mexico, you may find mangos year-round, yet if you want to have the best ones, try them when they are in season during the summer. Fruit-loaded trucks stand right in the streets, and plenty can be found at local markets. The price is always low.
The only thing to keep in mind while buying mangos is soft means ripe. Black spots on the skin don't spoil its heavenly sweetness. Hard mangos have clear skin, which may entice you, but those are actually unripe and bitter. The best way to enjoy a mango is simply cut it, and eat the insides with a spoon. Besides, the fruit is used in many seasonal drinks, desserts, and salsas.