Yes, it happens, even as the leaves are turning reddish-brown and falling off. There are several autumn-blooming trees around the National Mall.
Cherry blossoms or not, there's already spring color on the Mall - WTOP News
Here comes the bloom! Nats, Wizards honor DC's cherry blossoms
Cherry Blossoms in November? The Autumn Bloom on the National Mall
Cherry Blossoms in November? The Autumn Bloom on the National Mall
BloomCam — Trust for the National Mall
Here comes the bloom! Nats, Wizards honor DC's cherry blossoms
Bonn's Cherry Blossoms: A Social Media Hit – DW – 04/08/2022
Guide to the National Cherry Blossom Festival in Washington, DC
Here comes the bloom! Nats, Wizards honor DC's cherry blossoms
Here comes the bloom! Nats, Wizards honor DC's cherry blossoms