1. Western Oregon Coast Range:
- Treeline elevation: Approximately 4,000 to 5,000 feet (1,219 to 1,524 meters).
- Treeline species: Mountain hemlock, subalpine fir, and Pacific silver fir.
2. Cascade Range:
- Treeline elevation: Varies between 5,000 and 7,500 feet (1,524 to 2,286 meters), depending on latitude and specific locations.
- Treeline species: Mountain hemlock, subalpine fir, and whitebark pine.
3. Central Oregon High Desert:
- Treeline elevation: Approximately 7,000 to 8,000 feet (2,134 to 2,438 meters) in some areas.
- Treeline species: Lodgepole pine, juniper, and mountain hemlock.
4. Blue Mountains:
- Treeline elevation: Ranges from 6,500 to 8,000 feet (1,981 to 2,438 meters).
- Treeline species: Subalpine fir, mountain hemlock, and whitebark pine.
5. Siskiyou Mountains:
- Treeline elevation: Approximately 7,000 to 7,500 feet (2,134 to 2,286 meters) in the southern part of the range.
- Treeline species: Mountain hemlock, subalpine fir, and whitebark pine.
It's important to note that these are approximate ranges and actual treeline elevations can vary depending on local conditions and specific mountain ranges.
