Seattle (Washington) has 2 climbing gyms in our database. We confirm data at the source; still, check hours and climbing type with the gym before you go.
Bouldering Project Poplar — Bouldering, 900 Poplar Place S, Seattle, WA 98144. Hours: Mon–Fri 06:00–23:00, Sat–Sun 07:00–22:00.
Vertical World Seattle — Bouldering + rope, 2330 W Commodore Way, Seattle, WA 98199. Hours: Mon–Fri 06:00–22:00, Sat–Sun 08:00–20:00.