Use a paring knife to cut around and remove the core from each tomato.
Place the tomatoes in a sealable freezer-proof plastic bag. Freeze for 6 to 8 months.
To defrost the tomatoes, place them in a large bowl and cover with warm tap water. Wait 1 minute, then remove skins by squeezing from the bottom until they pop off. Thaw completely at room temperature, about 30 minutes, then chop. Use the chopped tomatoes in soups, stews, and pasta sauces. (Do not eat raw or use in salads, as the texture does not hold up in the same way after freezing.)