Dear ,
It depends on your car, if it has good road clearnace, as neelum road is most worset road in northern areas, as government there is most ignorant and does not care, even our Army does not care to improve the road, as it is only one road connecting far off areas like sharda, kel , halmat region.
Secondly, road to sharda is always open except any slight rain, road is guranteed to get closed for 24 hours least, as it gets debris very easily as mountains are sloppy.
Thirdly, if march you can go till sharda on your own vehilce but not far off. in August you can go till Taobut Valley. see these plans for itineraries it might help you.