Peel and coarsely chop the peaches. Place them in a bowl of a food processor and pulse until you reach a chunky puree. (Don't have a food processor? Simply use a potato masher to mash them up in a large bowl.) You should end up with about 3 1/2 cups of puree.
Pour the puree into a large bowl and add the lemon juice and stir well.
Add the sugar and stir until dissolved. Gradually add the pectin to prevent lumps and stir very, very well. (I like using a whisk here for this part.) Spoon the jam into clean jars with tight fitting lids ensuring you leave about 1/2 inch of space at the top of the jar to allow for expansion in the freezer. Allow the jars to sit a room temperature for 30 to 45 minutes to set. Store the jam in the refrigerator or the freezer. The jam will last in the refrigerator for 3 to 4 weeks and in the freezer for about a year.
You can use any freezer-safe jar in any size for this. There are some really great plastic freezer jars available or you can use standard jelly jars with lids and bands like I did. If you don't think you'll go through 8 ounces of jelly in 3 weeks, just use the smaller 4 ounce jars and keep the rest in the freezer.
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