The main park road crosses the park in a half-circle with entrance stations at either end. It is usually open from mid-June through late November. Most visitors enter the park at the Southwest Entrance Station, drive through, and leave through the northwest entrance, or vice versa.
The 30-mile tour through this rugged yet captivating region should take no more than a couple of hours, though it's a good idea to factor in a few more hours to hike up Lassen Peak or explore the Devastated Area and Bumpass Hell. If there's time, make an effort to stop at Sulphur Works near Mineral (about 2 miles from the southwest entrance), an acrid, noisy cauldron of steam vents that let off a mighty pungent odor.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.