The forecast for Washington’s famed cherry trees is official: Their blossoms should peak April 4-9, smack in the middle of the annual cherry blossom festival, scheduled for March 26-April 10.

The prediction for the blooms came from Rob De-Feo, chief horticulturist at the National Park Service.

But the dates for the annual festival must be picked months before horticulturalists can say when the trees will actually blossom. That depends on weather conditions.

Mr. DeFeo said there have been blossoms for 13 of the past 15 festivals. The blossoms have been at their peak during 10 of those years.

This year’s festival includes more than 90 events. Among the most anticipated is the Cherry Blossom Parade, which is scheduled for April 9 on Constitution Avenue. Mickey Mouse will be the grand marshal.

One week earlier, on April 2, there will be a fireworks show on the Southwest Washington waterfront.

“It’s going to be a great spring for the nation’s capital,” said Bill Hanbury, president of the Washington Convention and Tourism Corporation. He said about a million people are expected to attend, which would be comparable to last year.

Visits to the festival’s Web site also are up about 35% from a year ago, said the festival’s executive director, Diana Mayhew. This year’s festival celebrates the 93rd anniversary of the gift of the trees from Japan. Most of the trees lining the Tidal Basin are descendants of those presented to America by Japan in 1912 to mark 60 years of friendly relations.

For details, visit the National Cherry Blossom Festival, www.nationalcherryblossomfestival.org.