Update March 21:

It’s officially spring, folks: After snow failed to precipitate this weekend, the cherry blossoms are projected to bloom on or about Wednesday, the National Park Service said in an email on Monday morning:

The cherry blossom bloom cycle was not affected by this weekend’s weather, as forecast snow never materialized at the Tidal Basin and temperatures stayed well above freezing. Although tonight’s forecast is for near-freezing temperatures, the peak bloom period is still expected to begin on or about March 23. Once peak bloom is reached, the blossoms can remain on the trees for 4-10 days.

Brace yourselves for the tourists. 

Original Post:

Sorry to interrupt your Metro-closure freakout, but the National Park Service now says the cherry blossoms will reach peak bloom on March 23 or 24, not between March 18 and 23 or at the end of March, as was previously announced. NPS has revised the date as it will be chilly and may snow this weekend. What a time to be alive.