Just $50, a 24-month day-use parking permit offers the most value -- $10 less than buying two, 12-month parking permits for consecutive years. Valid for 24 months from the month purchased, the parking permit is honored at all 26 Oregon State Parks that charge a parking fee. The permit is valid only in parks operated by Oregon State Parks (see map of parks charging a day-use parking fee), and cannot be used for camping or extra vehicle fees.
If you're camping at a state park, you don't need a day-use parking permit. Just display your current state park camping receipt on your dashboard.