This forum is only about Yosemite. Definitely read the relevant topics in the Top Questions on the right. Camping is the next to last topic. Read about winter weather. You need a Plan B if it's snowy when you arrive.
For overall multi-state advice, I suggest the Road Trips forum: https://www.tripadvisor.com/ShowForum-g1-i12567-Road_Trips.html
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