I don't think so, at least if it's blooming now. Oak leaf hydrangeas, at least the ones I've seen, bloom in the summer and the blooms are in panicles, like peegee hydrangea. Could it be a viburnum? Could you post a close-up of the leaves?

This is the only other one I have for now. I'll have to take another one today.

It looks to me like Viburnum opulus (AKA highbush cranberry.) This looks like the lacecap flower form, which I think is the wild type, rather than the snowball form of flowers.

This post was edited by nhbabs on Mon, May 27, 13 at 13:44

Oakleaf hydrangea has an oak leaf type of leaves and also has panicle or conical blooms. It is in bloom down here now but, it is too early for blooms in your zone so it makes more sense that it be some type of early flowering vibirnum. Pretty though. Reminds me of an unnamed H. Macrophylla that I have; it has lacecap blooms like in your picture but my plant does not grow as tall as your shrub appears to be. My lacecap hydrangea leaves are different from yours too.

Sample oakleaf hydrangea picture:
http://search.yahoo.com/search?p=picture+of+oakleaf+hydrangea&fr=chr-swat02

Here is a link that might be useful: {{gwi:229960}}

Looks like viburnum Onondaga

Looks like viburnum Onondaga

Thank you all! I agree with the viburnum Onondaga comments. Thanks!