Most of mine are blooming now, or at least have their flower scapes starting to come up. The exceptions are 'palace purple', 'bronze beauty', 'caramel', and 'christa'. The latter 3 are all villosa hybrids (I think) and I was under the impression that villosa hybrids bloomed later... but I could be wrong.

For me, 'paris' and 'hollywood' have the longest bloom time lasting from late spring - early fall.

Some of the newer ones rebloom again in summer.