How to Ripen Green Tomatoes Indoors:
A Simple Way to Stretch Your Harvest

How to ripen green tomatoes indoors for winter use.

Here in the Willamette Valley, our tomato season usually wraps up by mid to late September.

The nights turn cool, the rain moves in, and there are always vines still loaded with green tomatoes that never had a chance to ripen before the weather turned.

It was very discouraging to see all those good green tomatoes go to waste!

My husband grew up in Russia, where the growing season is shorter than ours, and where this exact problem is simply part of gardening every single year.

He taught me how to ripen green tomatoes indoors, and it has completely changed how we think about the end of our tomato season.

Instead of an ending, it has become a slow, steady stretch that carries us through the fall and often all the way to Christmas.

This is not a complicated method. It does not require any special equipment, and it does not involve grocery-store tricks like sealing tomatoes in a paper bag with a banana. It is simply patience, newspaper, and a bit of floor space.

The Method: Pick, Lay, and Wait

green tomatoes in the fall garden ready to be brought indoors for ripening

In our climate in western Oregon, many of our tomatoes don't have time to mature and ripen before rains and frosts occur. They can be picked, and brought indoors to ripen over the coming months.

The timing matters more than people realize. My husband doesn't wait for frost to actually threaten before bringing tomatoes in — by then, it's already too late. Frost damages the skin, and a damaged tomato won't ripen properly no matter what you do with it afterward.

Instead, he watches for the point in early fall when the weather turns cool enough that the tomatoes are no longer getting the warmth and sunlight they need to ripen well on the vine. By that stage, whatever is still green is ripening so slowly that it's barely progressing at all. That is the real signal to bring everything in, while the tomatoes are still in perfect condition.

Heavy fall rain is the other thing to watch for. Once the cool, wet weather sets in, tomatoes left on the vine tend to split, which ruins them just as surely as frost does. So the goal is to harvest everything while it is still sound and undamaged, right at the point when the vine has essentially stopped helping them along.

harvesting green tomatos for indoor ripening

Harvesting green tomatoes from the garden to ripen indoors, before frosts or damaging rains occur. So nice not to see them go to waste any longer!

When that time comes, my husband picks all the normal sized green tomato still on the plant.
You can pick the smaller ones also if wanted.
There is no sorting by how close they look to ripening.
Small, medium, full-sized and still hard as a rock, they all come in, as long as they are still in good condition.
If the tomato is damaged in any way, don't try to ripen it indoors.
Any cracked, split, or other kinds of damaged tomatoes should be left behind, or used immediately for other purposes, such as green tomato relish or other green tomato recipes.

He lays sheets of newspaper flat on the floor, somewhere out of the way, and sets the tomatoes down top-side down, not touching each other if there is room to avoid it.

That is really the whole method. No plastic, no covering, no special temperature. Just tomatoes on newspaper, left alone.

Here we use a mostly unused corner of our living room. In Russia, my husband's home was very small, and he said that they kept the unripe tomatoes on newspaper under a bed where they were out of the way. (He said that they always also kept a crock or small barrel of pickled green tomatoes which were greatly enjoyed during the winter. But that is a story for another day!)

From there, they ripen slowly and unevenly, exactly like they would have on the vine, just indoors instead. A few will turn red within a week or two. Others take much longer. We simply check them every few days and pull out whichever ones have ripened, leaving the rest to keep going.

This is how we have had fresh, ripe garden tomatoes as late as Christmas, months after our outdoor tomato season here in Oregon has ended!

Why This Works

Step	What to Do	Why It Matters
Pick before damage occurs	Bring in all green tomatoes once cool weather slows vine-ripening, and before frost or heavy rain arrives	Frost damages the skin and stops ripening entirely; heavy rain causes splitting. Both ruin a tomato that would otherwise ripen fine indoors
Lay them out	Top-side down on newspaper, spaced apart if possible	Keeps air moving around each tomato and makes it easy to spot any that spoil
Leave them alone	No bag, no wrapping, no added heat	Tomatoes ripen on their own timeline using the ethylene gas they naturally produce
Check every few days	Pull ripened tomatoes as you find them; remove any that spoil instead of ripening	Keeps you eating a steady trickle of tomatoes instead of one big batch, and one spoiled tomato won't spread to the others

A Few Things We've Learned Along the Way

Not every tomato will ripen. Almost all of them will. But a few, especially the smallest, hardest green ones, may simply never turn. That is normal, and not a sign you did anything wrong.

Check on them regularly. A tomato that starts to soften or spoil instead of ripening should be pulled out right away, so it doesn't affect the ones next to it.

A room temperature, dim spot works better than a hot, sunny one. Contrary to what many people assume, tomatoes do not need direct sunlight to ripen indoors. Room temperature, out of direct sun, is plenty.

Do not rush it. The tomatoes that take the longest are often some of the best-tasting ones you will pull from that newspaper all season.

This is all you need to know about how to ripen green tomatoes indoors! It was so good to see all those green tomatoes still on the vine in the fall not going to waste!

Frequently Asked Questions

1. Do green tomatoes need sunlight to ripen?
No. Tomatoes ripen using warmth, not light. A cool, dim spot works just as well as a sunny windowsill, and keeping them out of direct sun actually helps them ripen more evenly rather than turning soft or wrinkled on one side first.

2. Will tiny green tomatoes ripen?
Not always. The smallest, hardest green tomatoes often never developed far enough on the vine to finish ripening indoors. Focus on tomatoes that are at least half-grown, or close to their full size, even if they're still completely green. The very smallest ones can simply be composted or used in green tomato recipes instead.

3. Can I use damaged or imperfect green tomatoes?
No. Only bring in tomatoes that are firm and free of cracks, splits, or soft spots. A damaged tomato is more likely to spoil before it ripens, and if it does spoil while sitting on the newspaper, it can affect the tomatoes touching it. Set damaged ones aside for immediate use instead.

4. How often should I check the tomatoes?
Every few days works well. Pull out any tomato that has ripened so you can enjoy it, and remove right away anything that has started to spoil instead of ripen. Checking regularly is really the only ongoing care this method requires.