Albuquerque, NM
 
As for non-bulbous, non-aril, non-dwarf Iris here.
 
Saw the first 'Crimson King' in flower on February 29.  Probably doesn't count since it was up against a wall, but the flowers didn't freeze off.
 
Right now end of March/ first of April, I am seeing sporadic blooms on Iris x germanica cultivars (the real ones), 'Golden Cataract', 'Crimson King', 'Eleanor Roosevelt', 'Dorothea', all common "hand-me-down" +/-44 chromosome IB's (or small TB's if you stretch a point).  'Bold Statement' has a few flowers open at the botanic garden.  I haven't really gone through gardens looking for what is in bloom, these are just the noticeably common ones.  As plants go, things are actually running about on schedule to a bit late (a week or two) this year, here.  The weather was mild this winter (except for one sub-zero-F night in December), but cooler than average, and it's warm now (mostly 70's - 80's for highs! , and 30's - 40's for lows).
 
Interestingly, last year in November, there was an unusually heavy rebloom on the local plantings of 'Crimson King' and 'Golden Cataract', and the bloom on these this spring seems light (but it's just getting started, so maybe there are more bunds hiding in those fans).  I don't know if the coldest two weeks Albuquerque has ever experienced (February 2010) may have boosted that rebloom?
 
Dave Ferguson
in New Mexico