10/13/2026
A green tomato can keep changing after it leaves the vine. Tomatoes produce and respond to ethylene, a natural plant gas that signals ripening. If a tomato has reached the “mature green” stage (full-sized, with developed seeds) it can often finish ripening indoors. As it ripens, chlorophyll, the green pigment, gradually breaks down and other pigments become visible. The fruit also softens and changes color, depending on the variety.
Set mature-green tomatoes in a single layer at room temperature, away from direct sun, and check them regularly. Cold temperatures slow ripening, so the refrigerator can pause the process and may affect texture and flavor. Once a tomato is ripe, refrigerate it if you need to keep it longer; letting it come toward room temperature before serving can bring its flavor forward. Some varieties stay green when ripe, so color alone isn’t always the cue, look for the variety’s expected color and a gentle give.
Do you usually let tomatoes ripen on the counter instead of putting them in the fridge?