This peak is on Stimson Lumber land. Fortunately they allow non-motorized public access, dawn til dusk, with no permit required. There are a few caveats to be aware of (no fires, no e-bikes, no drones, and more). For details, and to make sure this tract is still open when you plan your visit, look for the "Stimson’s Public Access Policy" PDF on their site, linked from this page:
On a training hike for our Switzerland Hiking / Climbing tour next July / August. Accompanied by my wife Sharon and our Labrador Retriever Dexter. Rattlesnake Mountain is a relatively easy 9.2 miles round trip (including preliminary walk to trail head from parking lot), gaining 2,500 feet +/- to a summit elevation of 3,517. TH is is easily accessible from my home QTH in Bellevue, WA. I-90 east to exit 32 in North Bend, then good but windy paved road to Rattlesnake Lake area. The hike is through mostly wooded terrain, with some sections