I'm a zone south of you and my blueberries have the buds swollen but nothing is leafing out yet. For timing in my zone, the blues wake up when the crocuses are at the end of flowering and just before the daffodil flowers open. They also get started a couple of days after my blackberries bud break and about concurrently with the first signs of growth on elderberries. I'd guess you still have a little time to go. Hope it helps.

Thanks. Haven't seen any crocus, but have found a daffodil open. Overachiever. The rest look like they're a couple weeks away. Appreciate your input, makes me a little less worried.

Cheers
dave