Yosemite area camping end March-too snowy? campsites? tips?

Yosemite valley is about 4000 feet with generally minimal snow accumulation. Yes you can get a big storm that takes a bit to melt and may close the roads until plowed or melt. No hookups in the valley so you need to review your 12v system and charging method.

Otherwise I believe there are a few RV camping spots along CA140 if you want to plug in and then drive into the valley during the day.