Dog Mountain is technically in Washington, not Oregon, but it is being mentioned on this site because it is just a stone’s throw across the Columbia River from Oregon and it makes for an epic springtime hike.
The trailhead is easy to find and it is very large to accommodate the huge number of people who do this hike every year. The best time to go is in mid-April, May and early June when all of the wildflowers are blooming on the hillside. During wildflower season be prepared to see hundreds of hikers!​