My weeping cherry (5 years old tree) does not appear to be blooming but has dark flower buds. Should have bloomed by now, also not leaving out. I'm in zone 5, Lincoln, Ne.
Weeping Cherry Not Blooming
Certified GKH Gardening Expert
I would not worry to much yet, it was an very cold winter and your tree may be just taking a little longer to blossom this spring.
If the tree is budding, it's most likely just waking up on a different schedule this year.
I'm just a bit north of you in a Zone 4 and we are weeks behind our 'normal'!