From an email from Theresa Mullen, marketing manager for Union Square Hospitality Group:
We told you we'd share opening day news the second we knew, and here we are: Our official opening day for the Upper West Side Shake Shack is this Monday, 10/20. Shack’s hours on the Upper West Side will be in flux for the first few weeks (11:00 AM - 9:00 PM), but once the Shack is really shakin’, it will be open seven days a week from 11 AM - 11 PM. Our site will keep tabs on any hour changes.
Depending on how practice sessions go, Shack may open it's doors to the neighborhood a little sooner than Monday. But the official (read: definite) opening is Monday at 11:00 AM. Our full release will follow later this afternoon. Thanks for taking the time this week to come by and check out our new digs!
Yours in Shack,
Shake Shack UWS
366 Columbus Avenue, New York NY 10024 (at 77th Street; map)