This geocache is just steps away from the small parking area and trailhead that leads ~8 miles to the Rock Mountain summit. No parking pass is required, but the steep trail (4000 feet of elevation gain to the summit) requires a small piece of your soul.
The short road from US 2 to the trailhead is a bit rutted, so keep that in mind if your vehicle doesn't have much clearance. You are searching clear, labeled Lock & Lock container.