How long does it take to drive from Mt St Helens to Mt Rainier?

Answer 1

3 hours and 6 minutes is the shortest route that Google Maps could come up with, which is a 149 mile drive through Southern Washington, although you will be able to see the Oregon border when passing the Columbia River.

Alternatively, if you wanted to cycle, a 104 mile course is available for bicycles, However, this would be an 11-hour trip by bike, or 32 hours by foot. Driving is recommended, although possibly less scenic.