At the end of 436th Ave SE / Cedar Falls Rd, heading south from exit 32 off I-90 east of Seattle. There is parking by Rattlesnake lake, with the trail leading up to Rattlesnake Ridge (1.5 - 2 miles up the trail) and beyond. I failed to make note of how long it took me to hike up the steep trail - around an hour or so. The hike back down took me about 40 minutes. I didn't far beyond the ridge, but I did go far enough to get some photos looking down on the ridge. There are supposedly more excellent views further up the trail. Seattle P.I. Hike of the Week recently, with more details. The ridge and the lake (and the mountain, I assume) reportedly get their name from a Seattle pioneer startled by seed pods, not from the actual presence of rattlesnakes.