Radium Hot Springs is a Parks Canada mineral-water pool, not a multi-room resort spa. It sits within Kootenay National Park in British Columbia and works best as a bathing stop on a Rockies itinerary. The photograph shows the pool in 2006; its appearance and facilities may have changed since then.
Admission is not an online booking
Parks Canada says entry is first-come, first-served, with tickets sold at reception rather than online. Capacity can mean a wait, especially for a group. Its FAQ also says visitors using facilities inside Kootenay need a national park pass. The park pass and pool admission are separate costs. Check both current fee pages before committing to the drive; a past published price is not a reliable budget for your date.
Choose the pool, then check its hours
The facility has a mineral hot pool, which Parks Canada describes as 37–40°C, and a deeper, cooler swimming pool. They do not always share opening hours: the operator publishes different seasonal schedules for the two pools. Check the pool you intend to use, not merely whether the site is operating. The operator advises frequent cooling breaks and water to avoid overheating, and recommends limiting soaking to roughly one or two hours. Lightning or a technical issue can change access unexpectedly.
Arriving without assuming services
The pools are by Sinclair Canyon in southern Kootenay. Parks Canada's directions warn that there is no public transport, fuel or food service inside the national park. Plan supplies and the onward route, and check current road and facility notices. Three useful distinctions are walk-in admission, the additional park pass, and pool-specific seasonal hours. This is a planned stop, not a guaranteed drop-in at any hour.