A dramatic high-altitude Washington road climbs through wildflower meadows and alpine views, offering one of the most breathtaking mountain drives in America.

The last of the roads closed for winter in Mount Rainier National Park were expected to open Thursday afternoon. Mowich Lake Road and Sunrise Road both opened about 2:30 p.m., according to the park.

It was closed for the winter season, according to the National Park Service, therefore restricting access to Mount Rainier. Officials recommended that RVs and vehicles with trailers longer than 25 ...