Freezer jam is perishable due to it not being processed after its canned likle regular. No and low suagr jams are also affected within a few weeks and can also get moldy. If you want a safer product that will last much longer in the fridge, add a bit of acid blend or citric before its cooked. Pomona is a citrus based product that has no shelf life like regular and no/low sugar types. Furthermore, the low/no sugar types tend to be like a thick Jello as opposed to a spreadable jam. I would keep the fridge temp at 35-37 degrees and no higher. I have jars of Pomona sugarless that are in my fridge up to six months with no signs of mold.

When sugar is added in high amounts, it binds up water that allows molds and other bacteria to grow in the moisture.
So, with low or no sugar, you don't have that preserving quality. If you look at the Ball stuff, they normally put chemicals in it to prevent mold. The Pomona's is a natural product. Therefore, it molds more quickly. I don't keep freezer jam in the fridge, but always in the freezer. It thaws so fast you can spread it easily.

Thanks for clearing that up for me! I'm going to try a batch or 2 and see how I like it.