The National Park Service this afternoon (March 8) moved its peak bloom forecast up to falling sometime in the period March 18-23.
Last week, they predicted March 31 to April 3, but very warm weather forecast for this week and next has prompted them to move their prediction earlier.
Earlier in the afternoon, the Washington Post's Capital Weather Gang issued their own forecast: March 24 to 28.
You can find the latest forecasts on the 2016 peak bloom forecast page.
Want to Help Support DC's Cherry Trees?
If you'd like to help support the care and upkeep of the cherry trees around the Tidal Basin, the Trust for The National Mall has launched an Endow a Cherry Tree Campaign. Donations go to the official Cherry Tree Endowment, which will give the National Park Service additional resources to fund the care, maintenance, and possible replacement of the cherry trees. You can find more information here.
The Trust is dedicated to marshaling private support for maintaining and improving the history National Mall area. I'm not affiliated with the Trust--just an admirer of their efforts.