You have several good options for green tomatoes before frost shows up in your garden. Most of those unripe fruits can still become tasty red tomatoes if you bring them inside at the right time. The key is knowing when to pick and how to store them for best results.
I saved over 30 pounds of green tomatoes before an early October frost hit my garden last year. By Thanksgiving, I was still eating fresh tomatoes that had ripened on my kitchen counter. That extended my harvest by almost two full months past the frost date.
Watch your weather forecast once fall arrives and plan to harvest before frost threatens. Tomatoes suffer damage at temperatures below 32°F (0°C) and will not ripen right after they freeze. Pick everything green if frost shows up in the forecast for the next few days.
Ripening green tomatoes works because the fruit keeps producing ethylene gas even after you cut it from the vine. This natural plant hormone triggers the color change and flavor development. Your green tomatoes don't need the plant anymore to finish their job.
Temperature controls how fast your tomatoes ripen once inside. Colorado State data shows indoor tomato ripening at 65°F to 70°F (18°C to 21°C) takes 1 to 2 weeks. Cooler temps around 55°F (13°C) slow things down to 3 to 4 weeks if you need more time.
I use the temperature difference to stagger my ripening so I don't end up with 30 pounds of ripe tomatoes all at once. Some go in a warm spot near the kitchen for quick eating. Others go in the cool basement to hold for later meals.
Harvest Before Frost Arrives
- Watch the forecast: Pick all your tomatoes when temps below 35°F (2°C) show up in the week ahead.
- Cut with stems: Leave a short stem attached to each fruit to reduce the entry point for rot and mold.
- Handle gently: Bruised spots turn soft and rot first, so treat green tomatoes like eggs when you pick.
Sort by Maturity Stage
- Check the color: Tomatoes with any hint of pink or yellow will ripen fastest, often within a week.
- Feel the texture: Fully mature greens feel slightly soft when squeezed and ripen better than rock-hard ones.
- Separate groups: Keep the almost-ripe ones away from the very green ones so you can use them first.
Store for Best Ripening
- Single layers only: Stack tomatoes no more than two deep so air flows around each one properly.
- Check often: Look over your stored tomatoes every 2 to 3 days and remove any that show rot.
- Boost with apples: Put a ripe apple in the box to add extra ethylene gas and speed up the process.
The very small tomatoes that are still hard and dark green often won't ripen well indoors. These work better for fried green tomatoes or green tomato relish instead. Don't throw them out when you can cook with them fresh.
I wrap my tomatoes in newspaper when I want slow ripening over many weeks. The paper soaks up moisture and cuts mold while letting ethylene gas do its work. This trick saved my late harvest for fresh eating right through December last year.
Your garden doesn't have to end when frost arrives. With smart timing and proper storage, those green tomatoes become red, ripe fruit that tastes almost as good as summer picks. Start watching the forecast in September and be ready to bring your harvest inside before the cold hits.
Read the full article: How to Grow Tomatoes: Essential Steps for Success
