Sequoia (Sequoia giganteum) does surprisingly well in much of the Pacific Northwest. Growing up, I saw pictures of massive sequoias growing in the Sierra Nevada. Little did I know, they were growing all over the place! When you learn what they look like, it's hard not to notice them. In many PNW cities, you can often see at least one or two in any neighborhood. Their unique shape and very large size usually gives them away.
Rather than focus on the species as a whole, I'm going to focus on their growth in the Pacific Northwest. They grow readily in our mild, oceanic climate, which has some striking similarities to the high altitude locations in the Sierra Nevada where the species is native. However, one key factor prevents them from naturalizing: they need fire for their cones to open. As a result, we don't have naturalizing populations of giant sequoia in our parks, like we do for coast redwoods.
Within the Northwest, they can be found growing in a surprising range of locations. Sequoia are significantly more cold hardier than their northern relatives, the coast redwood. Giant sequoia can be found in arid locatoins in central Washington, and even as far inland as Idaho.