Many common fruits continue to ripen after they’re picked, including bananas, peaches, pears, avocados, mangoes, and tomatoes. These fruits belong to a category called climacteric fruits, and they can gain sweetness, soften, and develop fuller flavor sitting on your kitchen counter. Other fruits, like strawberries, grapes, and citrus, will never improve once they leave the plant.
Fruits That Ripen After Picking
The following fruits will continue to soften, sweeten, or both after harvest:
- Apples
- Apricots
- Avocados
- Bananas
- Cantaloupe
- Figs
- Honeydew melon
- Kiwifruit
- Mangoes
- Nectarines
- Papayas
- Peaches
- Pears
- Persimmons
- Plantains
- Plums
- Tomatoes
These fruits produce a natural plant hormone called ethylene as they mature. Ethylene triggers a cascade of changes: it converts stored starches into sugars, breaks down cell walls to soften the flesh, deepens color, and generates the aromatic compounds that give ripe fruit its smell. Once these fruits reach a certain stage of development on the plant, they can complete that entire process on their own, even after being picked.
Not all of them change in the same way, though. Bananas and peaches become noticeably sweeter as they ripen off the tree. Plums, on the other hand, mainly get softer without a dramatic increase in sweetness. Knowing the difference helps you buy with the right expectations.
Fruits That Stop Ripening at Harvest
These fruits need to reach full maturity on the plant. Once picked, they won’t get sweeter or develop better flavor:
- Blackberries
- Blueberries
- Cherries
- Grapes
- Grapefruit
- Lemons
- Limes
- Oranges
- Peppers
- Pineapple
- Pomegranates
- Raspberries
- Strawberries
- Watermelon
Strawberries are probably the most commonly disappointing example. If they look pale or underripe at the store, they will never improve. The same goes for grapes, citrus, and berries. With these fruits, what you see at the store is what you get, so choose carefully. Look for deep, consistent color and a fragrant smell at the stem end.
Why Ethylene Makes the Difference
Ethylene is a gas that fruits naturally produce, and it acts as a ripening signal at the cellular level. When ethylene molecules bind to receptors inside the fruit’s cells, they switch on genes responsible for softening, color change, and sugar production. In fruits that ripen after picking, this process is self-amplifying: the fruit produces ethylene, which triggers more ethylene production, which accelerates ripening further. That’s why a bunch of bananas can go from green to spotted brown in just a few days.
Fruits that don’t ripen after picking still respond to ethylene to some degree, but they lack the internal feedback loop that drives the dramatic post-harvest changes. They depend on the plant for the sugars and acids that define their flavor.
The Banana Example: Starch Becomes Sugar
Bananas offer the clearest illustration of what happens inside a ripening fruit. A green banana is roughly 70 to 80 percent starch by dry weight. During ripening, ethylene activates a large set of starch-degrading enzymes that break down starch granules layer by layer, converting them primarily into sucrose. This is why a green banana tastes chalky and a yellow banana tastes sweet, even though both contain the same amount of total carbohydrate.
That starch-to-sugar conversion doesn’t just affect taste. It also provides the energy that powers other ripening changes, including the yellow color development, the production of volatile aroma compounds, and the softening of the pulp. It’s all one interconnected process, triggered by ethylene.
Avocados: They Only Ripen Off the Tree
Avocados are a fascinating exception even among fruits that ripen after picking. Most climacteric fruits can ripen either on or off the plant. Avocados essentially refuse to ripen while still attached to the tree. Researchers at UC Davis have long hypothesized that the tree produces some kind of ripening inhibitor that flows into the fruit, but no one has ever identified the specific compound. In practice, this means farmers can leave avocados on the tree for weeks or even months as a form of natural storage, picking them only when market demand requires it.
Once picked, avocados begin producing ethylene and ripen within several days to a week depending on temperature. This is why grocery store avocados are almost always rock-hard: they were harvested mature but completely unripe.
How to Speed Up Ripening at Home
The simplest trick is a paper bag. Placing an unripe fruit in a paper bag traps the ethylene gas it produces, concentrating it around the fruit instead of letting it dissipate into open air. This noticeably accelerates ripening. You can push the process even faster by adding a high-ethylene producer to the bag, like a ripe banana or apple, alongside whatever you’re trying to ripen.
Use paper, not plastic. Plastic bags trap moisture along with the ethylene, which promotes mold and spoilage rather than ripening. Paper is breathable enough to let excess moisture escape while still concentrating the gas.
Another method is burying the fruit in uncooked rice or flour inside a paper bag. The rice or flour absorbs moisture while trapping ethylene, reducing the risk of spoilage. This works especially well for avocados.
Temperature matters too. Room temperature is ideal for ripening. Cool environments slow ethylene activity, which is exactly why you put ripe fruit in the refrigerator to preserve it, but counterproductive when you’re trying to get a pear or avocado ready to eat. A warm spot in your kitchen will speed things along, but avoid direct sunlight, which can cause uneven softening or hot spots that lead to decay.
How to Slow Down Ripening
The same science works in reverse. If your fruit is ripening too fast, separate it from other produce (especially bananas and apples, which are ethylene powerhouses) and move it to the refrigerator. Cold temperatures slow ethylene production and the enzymatic reactions it triggers. This can buy you several extra days with ripe peaches, kiwis, or pears.
For fruits that don’t ripen after picking, refrigeration is your best tool from the moment you bring them home. Strawberries, cherries, grapes, and blueberries are already at peak quality when you buy them, so the goal is simply to slow their decline. Keep them cold and eat them quickly.
Picking the Right Fruit at the Store
For fruits that ripen after harvest, you have flexibility. Buying firm peaches, green bananas, or hard avocados is perfectly fine if you’re planning a few days ahead. In fact, it’s often the better strategy since you can time their ripeness to when you actually want to eat them.
For fruits that don’t ripen after picking, you need to choose more carefully. Look for fragrant smell, deep color, and a slight give when appropriate. A strawberry should be red all the way to the stem. A pineapple should smell sweet at the base. Grapes should be plump and firmly attached to the stem. With these fruits, there’s no second chance at home.