The park is open year round, 24/7.
Don't forget to see the ranch. And the orchard
Its never closes I wouldn't think. The only thing that would is the offices and store. Otherwise you can hike anytime and sightsee anytime.
This park is a drive through. With a few pull offs for heading out on hikes.
We've gone twice between Christmas and New Year's and don't seem to have a problem
The park is open 24/7. The visitor center is 8am to 4:30pm daily barring a major holiday or possible government shutdown. During winter though, some trails/ roads maybe closed depending on the weather due to safety issues with ice and snow. (My wife and I were there last week, had beautiful weather and no closures) Just do your research on which trails you'd likes to see and you'll be fine.
Check out nps.gov
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