The ASCO 2026 Exhibitor Room Block Management site will open on Monday, February 2, 2026 at 8:00 AM (ET).

Access to this website will remain open until 5:00 PM (ET) on Wednesday, April 8, 2026. All rooms must be paid for and reserved by this date or they will be released.

The Room Block Management site temporarily closes on Wednesday, April 8, 2026 at 5:00 PM (ET) and will reopen on Monday, April 13, 2026 at 8:30 AM (ET) for additional changes.  Shortened stays or cancellations are not refunded.

The Room Block Management Site permanently closes on Monday, May 4, 2026 at 5:00 PM (ET).

Changes cannot be made between Tuesday, May 5 and Tuesday, May 12, 2026 due to transition of hotel reservations to the hotels. Beginning Wednesday, May 13, 2026, please contact the hotel directly.