Roses are in bloom in Boston!. Once it stops raining (if it ever stops raining) you can visit rose gardens at:
The Arnold Arboretum, particularly if you’re interested in species roses (as opposed to modern hybrids)
The Longfellow House has climbing yellow roses—but if you’re not fond of yellow, you’re out of luck. If you’re out on a date with a yellow-rose lover, perhaps you can compromise with some apricot-hued blooms at the Boston Public Garden.