While the story is set in Forks, Washington, much of the actual filming was done in Oregon - Columbia River Gorge (the school dance or prom, I believe), Carver (the cafe), Oxbow Park (for its mossy, old growth trees), even our neighboring town, St. Helens. Some other scenes, such as the outdoor scenes at the high school, were shot in Kalama, Washington, just across the Columbia River from us.
I'm curious if they chose these places because they looked more like what they thought Forks should look like, if they were chosen for their proximity to a large metropolitan area (Portland), or if perhaps the real Forks was just TOO misty and rainy for good filming (Forks is known as the rainiest spot in the US).