Everything is running late in our part of zone 6a due to prolonged cold earlier. I use my earliest one, an unnamed daylily, as an indicator. It's similar to Nancy's
@lilyfan H. dumortieri and mine often blooms around May 5th. There were no scapes showing when I left on May 4th.
Justine
@HemBrain, excellent points about microclimates! Cold settling into valleys is one of the reasons orchards and vineyards are generally planted on high ground.
There are places in my yard where there are as much as 10 days difference in first bloom time on the same cultivar.
Pat