Voting to select the site of the 2027 Worldcon opened on June 28, 2025 and will be open until 17:00 (5 PM) Pacific Daylight Time (UTC -7) on Friday, August 15. WSFS members of Seattle 2025 are eligible to vote upon payment of an advance WSFS membership fee, which will count as a WSFS membership in the winning bid. You can vote by paper mail by downloading the site selection ballot, by voting online, or in person at Seattle 2025. See that Seattle 2025 website for details on how to purchase an advance WSFS membership and to vote.

The results of the election will be announced at the Site Selection WSFS Business Meeting on the morning Saturday, August 16, 2025 at Seattle 2025.