The peak bloom date is "defined as the period when 70% of the Yoshino Cherry blossoms are open," according to the National Park Service.

Peak bloom is declared by the agency when 70 percent of the blossoms around the Tidal Basin — the reservoir on the National Mall — have opened.

The National Park Service projects the cherry blossom trees that line the Tidal Basin in D.C. will likely be at peak bloom from March 28 to 31.