Mount Rainier is the most heavily glaciated peak in the contiguous United States and the most topographically prominent mountain in the lower 48 — a 14,411-ft active stratovolcano that towers 13,000 ft above its surrounding terrain. The park around it (designated 1899, the fifth-oldest US national park) protects 236,000 acres of old-growth forest, subalpine meadows, and 25 named glaciers. The signature visitor area is Paradise on the south flank, accessible from I-5 via WA-512, WA-7, and WA-706 to the Nisqually Entrance — the only entrance plowed year-round. Sunrise on the northeast flank is the highest point reached by a paved road in the park (6,400 ft) but its access road closes in winter. A timed-entry reservation system was piloted in 2024 and 2025 and is expected to continue at Paradise and Sunrise during summer 2026.
- Most heavily glaciated peak in the contiguous US (25 named glaciers, 35 sq mi of ice)
- Most topographically prominent mountain in the lower 48 (13,000+ ft of relief)
- Active stratovolcano, last erupted ~1894; monitored continuously by USGS
- Fifth-oldest US national park (designated 1899)
- ~1.6 million visitors per year, concentrated at Paradise and Sunrise