Now is the time to finish picking your ripe and green tomatoes as next week it will be in the 20s at night. If you wait till after a hard freeze, it will be too late.
How to save green tomatoes
If you have an abundance of green tomatoes on the vine, you still can bring them inside your house to finishing ripening them (not in a cold garage). Here’s how I do it although there are many ways to save them, I find using paper bags from the grocery store (yes that’s why you’ve been saving all those bags!) works really well.
How to pick tomatoes that will ripen
First you can tell which green tomatoes will probably ripen fully by looking at them. If you see the green is getting lighter on the sides, it will probably ripen as it has started the ripening process. Some have very dark tops and that is ok as long as the sides are a lighter shade of green. Also I just pick the bigger tomatoes as they are usually further along in the growing process versus the small totally dark immature tomatoes.
Use paper bags to ripen them
Place 2-3 layers of rock hard green tomatoes in bags as shown above-no more that a couple of layers because as they ripen, you don’t want the ones ripening underneath to get crushed. Also discard any that have blemishes.
Place tomatoes that are just starting to get color in another bag and move the ones that are starting to color up from the ‘green’ bag. Look into your ‘green’ tomato bag every few days and move them to the ‘just starting to color’ bags.
Important tip: Put a slice or two of apple (any color) in each bag. The apple slice will release ethylene gas which is a natural ripening hormone that is in many fruits. It will speed up the ripening process of your tomatoes in your paper bags. Replace apple slices as needed. It really works!
Close up all the bags so the apple does it’s work and none of the gas is released. I fold the paper bags over several times and then I put either something on top of the bags to keep them closed or I shove them under a rack to help keep them closed as shown above.
The trick is you must inspect the bags every few days and move them to another bag as necessary. If you just put them in the bag and forget about them, you might wind up with a bunch of the ripen ones squished with the heavier unripened ones on top.
Once they have changed color but still hard, you should take them out of the bag and put them on the counter to finish ripening. Never put a ripe tomato in the refrigerator. A cold refrigerator dampens the taste.
This method is really good on extending the tomato season once the weather is too cold. They will never be quite as good as the sun-ripened ones but are still about 200% better than store bought ones. I use a lot of them that get a little too soft for pasta sauces and eat the rest.
PS: Not all the green tomatoes will ripen but many will.