Can You Really Ripen an Avocado in the Oven?



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We recently saw a piece online claiming that you can ripen rock-hard avocados by baking them in a low oven, which in theory puts the ripening process into hyperdrive. We had to try it out.

Following the instructions, we wrapped a few unripe avocados in foil and placed them in a 200-degree oven. To our disappointment, after a full hour, all that had happened was that the outer portion of the avocado’s flesh had turned soft but slimy, while the interior had remained firm. A check-in with our science editor revealed why it didn’t work: Avocados ripen thanks to ethylene gas, a hormone that triggers enzymes in the fruit to convert starches to sugars and soften cell walls. While heat does stimulate the production of ethylene gas, there is a limit to both the rate of its production and the ripening reactions it produces—you can speed the process up only so much. Placing an avocado in a 200-degree oven doesn’t actually produce more ethylene or ripen the fruit—it merely cooks it, which is why our avocado turned slimy rather than softened like a truly ripened fruit.

Our suggestion? Don’t turn on the oven. Just plan ahead and let your avocados ripen on the counter. You can also put your unripened avocados in the refrigerator, but be sure to allow a few days longer for ripening.

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49 Comments

  1. Putting them in a bowl with other fruits that produce high levels of ethylene gas such as tomatoes and bananas also works well. Alternatively, move to South America where avocadoes get swept off balconies like leaves.

  2. For years, I have been ripening avocadoes by putting them into a paper bag with bananas, which release ethylene gas. I think it has been working for the dozens of times I have tried it, but if it's been a placebo effect, please let me know! Thanks.

  3. That was a really terrible test!! 200 degrees?? Of course it's going to cook! And then you go on to seemingly "explain" why temperature would not sure up ripening – only ethylene does that – before you conclude that ripening does after all happen a lot faster on the counter than in the fridge, with zero explanation of what, if not temperature, the reason for this might be! I don't know if the low temp oven ripening works, because this certainly was not a convincing test. How about several hours at 110 degrees, or something like that?? It's definitely not going to cook, and I suspect it'll ripen more than in the same time on the counter.

  4. Avocados also don't ripen on the tree. I've had years with bumper crops where they've held on the tree all the way into the next harvesting season. Those fruit are especially rich and fine tasting even though the seed may be starting to split and sprout inside.

  5. Theoretically, you should be able to ripen an avocado if you put it in one of those light, transparent plastic bags you get for free in grocery stores. most of them are made of poly ethylene (PE), which often gases out its building blocks (or monomeres), that is ethylene. i would just make sure to not completely close the bag in order to avoid moisture building up (-> moulding) and allowing oxygen to flow in and carbon dioxide to flow out. fruit and veg are living things and therefore "breathing" (on a cellular level), after all.

  6. You can also speed the process by adding a whole, overripe apple (soft but not browning) in the bag as the ripper the apple the more excess ethylene gas it gives off. I sacrifice a good apple all the time to quickly ripen other fruit.

  7. In case it is not obvious, you can take that note about avocados ripening more slowly in the fridge a step further. Once an avocado hits the ripeness you want, you can store it in the fridge and it will slow the process of it over-ripening.

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