While the immediate area around the volcano is characterized by volcanic terrain and is still recovering from the 1980 eruption, the surrounding region is a lush, temperate rainforest. This biome is defined by:

* High rainfall: This area receives over 100 inches of rain per year.

* Moderate temperatures: Summer temperatures are warm, while winters are mild.

* Dense vegetation: The region is home to tall, evergreen trees like Douglas fir, western hemlock, and Sitka spruce.

* Diverse wildlife: A variety of animals, including black bears, elk, and cougars, inhabit the temperate rainforest.

While the mountain itself is a unique environment, the broader surrounding region fits within the temperate rainforest biome.