Cascadia Con was the eighth North American Science Fiction Convention, held in SeaTac, Washington, on September 1–5, 2005, at the Seattle Airport Hilton and Conference Center.
After the "UK in 2005" bid was selected, essentially unopposed, as the World Science Fiction Convention to be held in 2005 (as "Interaction" in Glasgow, Scotland, the WSFS Business Meeting directed that a written ballot election be held at TorCon 3, the 2003 Worldcon in Toronto, Ontario, Canada, to select a NASFiC site for 2005.
[4] At Cascadia Con, St. Louis won the vote for the 9th North American Science Fiction Convention in 2007.
The anthology Northwest Passages was sponsored by Cascadia Con and released at the convention.
Cascadia Con was held under the auspices of SWOC, the Seattle Westercon Organizing Committee.