Prep Your Station. Before you start, you'll want to have everything clean and ready to go so you can work quickly. Sanitize jars and lids, set out a funnel, a clean washcloth or paper towel, and all your ingredients before beginning.
Prep Peaches. Peel and finely dice or mash the peaches and measure carefully Use exactly 3 cups of mashed peaches with their juices.
Combine. Add lemon juice & almond extract to the peaches. Add peach mixture, sugar, and water to a large saucepan. Whisk to combine.
Boil. Bring peach mixture to a rolling boil (bubbles all across the surface!) and boil 2 minutes (use a timer for best results).
Add Pectin. Add the pectin and whisk to combine, cooking another 2 minutes. Remove from heat and check that there are no lumps of pectin in your jam mixture.
Fill Jars. Pour jam into the clean jars, leaving 1/2 an inch of room at the top to allow for expansion in the freezer. Wipe any jam off the rims or sides of the jars and secure with lids.
Cool & Let Set 24 Hours. Let the jam cool 1 hour at room temperature, then transfer to the fridge and chill 24 hours to fully set. (If yours seems fully set after a few hours, you can transfer them to the freezer earlier!)
Freeze. Transfer set jam to the freezer and store up to up to 1 year. Thaw in the refrigerator a few hours in advance of serving, then store in the refrigerator up to 3 weeks.