As I posted earlier I don't think this will survive long term for you. The coldest parts of their native range are zn 8; some clones could possibly make it in zn 7. But not in zn 6 when you actually have a zn 6 winter up there. Which can easily go to -10F, rarely to -15F or even lower. I bet the record lows in most of NE PA are Of course if they are acorns from cultivated trees they could always be hybrids.

I happened to be looking through my old pictures from trips to the UK and found this scan. Holm Oak tree in a courtyard at St. Andrews, Scotland, 1996. They are very dark.
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This post was edited by davidrt28 on Wed, May 8, 13 at 23:36

Thanks for the pic. I am glad I didn't pay much for the seed then. I sowed the 5 acorns near one another. I don't expect much. Are Holm oak in the Red oak or White oak family?

Holm oak are in the white oak family. To make it a little more cold hardy it can be grafted onto a root from another white oak species, preferably Q. robur. It should be grafted some distance up the trunk then, because most frost damage use to be on the lower parts of the trunk.
There is also a cross between Q. ilex and Q. robur called quercus x turneri. It is somewhat more hardy than holm oak and holds on to the foliage until the new leafs emerge in spring. Really cold winter the leafs might be brown around the edges though, or the tree might even let go of the leafs completely.