Where should firewood be stacked?
Also asked, is it OK to stack firewood next to House?
Keep the pile near the home, but not too close. About 30 feet away or so is a safe distance. Choose a spot that has good drainage so the bottom layer of wood doesn't sink into muddy ground. Stacking wood on old pallets is even better, so the firewood doesn't touch the ground at all.
Similarly one may ask, how do you stack firewood on a hill?
Lay a row down on the ground and put pallets on the end to hold the wood in. I just secure my ends to the bottom with 2x4s. Then I would stack the uphill side first and try and keep it leaning that way as you stack to keep the weight off the downhill end.
To keep your wood from becoming wet, moldy, and/or infested with bugs it is best to keep your stack of firewood off the ground and covered.