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I purchased a ton in September 2017. I have used them in the past when I anticipated running low before at winters end.
After some bags burned poorly, I looked for the manufacture date. It was Dec 2016.
They are stored in a corrugated metal shed made from skids & 2 x 4's. They are also kept in the original Lingnetics skid cover bag. The shed is two skids high off the ground.

At least one out of three bags burn poorly with heavy black film on the glass door and burn chamber walls. After as little as a three hour burn there is enough heavy ash build up in the fire box of my Kozi Previa to prevent the electric igniter to light the pellets on the next burn. The stove is On a thermostat control.
As they winter progresses they burn poorer and poorer.