The ranger road lists it doesn't open till April sooo.... no go...it appears to be mostly 5,000 ft and above, and crests around 7,600 ft, so early March could have snow/mud to contend with on a dirt road. So, a lot depends on the weather. I've never ridden that road, so can't answer as to whether its something your bike could handle even in good weather.
even better, no traffic!!The ranger road lists it doesn't open till April sooo.... no go...