White oaks acorns could be planted now, they will germinate (just root) during the fall. You can test the ones you have to see if they are viable by putting them in a bucket of water, they good ones will sink (you could let it sit for an hour or two to see if some floaters fall). You would then have to find creative way to keep critters from diffing them up. On the other hand you could keep them till spring (in cool moist medium with ventilation) and try to get them to sprout then, the only trouble with that is finding a way to NOT damage tap root as its needed in early life of the tree.