Do oranges still become ripe after harvest?

No. Not at all. There are 3 types of fruit in this regard. Those that will ripen after harvest, those that will not continue to ripen after harvest, and those that will not ripen unless they are harvested. Citrus will not ripen further when harvested. read more

Your orange tree (Citrus sinensis), heavy with fruits, may seem ready for a huge harvest, but most varieties are not set for picking until 7 to 15 months after successful pollination. Unlike apples and avocadoes, oranges do not ripen when picked off of the tree -- they need a long period of warm days to sweeten the internal juices. read more

As mentioned above, color is not always an indicator of an orange’s ripeness. That said, you don’t want to pick green fruit. In many cases, the ripe fruit will simply drop from the tree. Check the fruit for mold, fungus, or blemishes. Choose an orange to harvest that smells sweet, fresh and citrusy, not moldy. read more