The forests of the Canadian life zone afford excellent cover for many mammals throughout the year. In summer such retreats are favored habitats for bear families.
Characteristic plants of this zone, though not confined to such association, include the Douglas fir, western red cedar, western hemlock, salal, Oregon grape, black cottonwood, bigleaf maple, and swordfern.
Here are found the raccoon, little spotted skunk, Oregon and Olympic meadow mice, and the mink. In this zone are seen in late spring the new-born fawns of the black-tailed deer.
Canadian Zone: This zone does not become well defined until above the 3,000-foot level. There is a considerable mixture of both Transition and Canadian elements at the approximate area of separation. While still heavily forested, the trees of the Canadian Zone are noticeably smaller than those at lower elevations and the forest is more open in character. Although common tree species include the Douglas fir and western hemlock of the Transition Zone, the most typical trees are the silver fir, Alaska yellow cedar, noble fir, and western white pine. Other typical plants are the Canadian dogwood, pipsissewa, and Cascades azalea.
There are no mammals which may be considered as characteristic exclusively of the Canadian Zone, since those occupying this zone also range into the Hudsonian.
Hudsonian Zone: At an elevation of from 4,500 to 5,000 feet the character of the forest cover begins to change. The trees are smaller, and the alpine fir and mountain hemlock become dominant tree species. Ascending to higher levels the forest becomes broken, with the number and extent of grassy parks and subalpine meadows increasing until finally all tree growth vanishes at an elevation of about 6,500 feet. This is the zone of beautiful summer wildflower gardens, a region of extensive panoramas and rugged mountain scenes. The avalanche lily, glacier lily, the heathers, paintbrushes, and the mountain phlox are common, as well as the white-barked pine.
Snow blankets the Hudsonian life zone throughout most of the year. Paradise Valley lies within this zone, the towering bulk of the Mountain above 6,500 feet is in the Arctic-alpine zone.
Snow blankets these highlands throughout most of the year, and the larger mammals are usually at the lower elevations during the winter months. Many of the permanent wildlife inhabitants are those which hibernate or are active beneath the snow, as the Hollister chipmunk, marmot, pika, Rainier meadow mouse, and Rainier pocket gopher.
Arctic-alpine Zone: Above the forest line all plant life diminishes rapidly in extent. This is a region of barren, rocky soils; perpetual snow fields; and glacial ice; a bleak and forbidding expanse of awe-inspiring grandeur where the storm king yields supremacy for only a few brief weeks in mid-summer.