The NPS said this afternoon that the cherry blossoms reached peak bloom for the 2017 season today, March 25. Peak bloom is when at least 70 percent of the blossoms are open. I have more details on what peak bloom does and doesn't mean here.
The calculation is a little different this year. Normally it's when 70 percent of the total. But because about half of them were wiped out by the cold recently, the calculation this year is based on 70 percent of the remaining blossoms.