1)The nearest airport is Shimla Airport which requires a one hour drive to reach.
2)The nearest railway station too is situated in Shimla at approximately 68 km from Hatu Peak. One can either take a bus or book a cab from here to the destination.
3)One way to get to the peak is by driving, either your own vehicle or a rental vehicle as there is a nice road going to the peak which hosts the Hatu Mata mandir
4)Another way is that you can obviously trek to the top, You can abandon the road and climb straight up which would make it a 4 km trek. This trek can be done in a day with ease even though there are steep sections in between.