You wouldn't be able to do the bus tour or visit the museum. The walk itself is free and only "closes" at night.
The gift shop and small museum would apply but if you walk to see the fossils they're not subject to holiday closures.
Some. They are closed on New Year's Day, Thanksgiving Day, and Christmas Day.
They're open year round for the free walk.
The fossils can be walked to anytime but are "closed" at night. Best to go on a day that is overcast to see them best.
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