Very pretty blazing mustard yellow that really pops in the landscape.
I took photos and tried to identify.
I think it's some kind of forsynthia.
Shrub view looks more mustardy toned yellow:
Than the closeups:
Possibilities for Zones 3&4:
Meadowlark forsythia, 8-10 feet height
Northern gold forsythia, 6-8 feet height
New Hampshire gold and sunrise varieties, 4 to 5 feet height
Gold tide or citrus swizzle, 1 1/2 to 2 1/2 feet height, 4 feet wide