Everyday. But there is a limit when the park reaches maximum auto capacity. They close when there are too many cars. Get there early especially during holiday weekends.
December through February 6 am to 5 pm the drive is open. The visitor center is open 8 am to 4:30 pm.
They are open everyday starting at 6am and closing at 5pm. If you're climbing, and might be there after dark you can call ahead and get a free permit so they know your car is allowed to be there.
They're open everyday. But they do have a maximum capability
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