There is one way to get here. Use highway from Zagreb to Karlovac, and than continue with main road D1 Karlovac - Slunj - Rakovica - Grabovac. In Grabovac turn left on the crossroad and follow the sign for Drežnik Grad.

If you are comming from the coast, than take highway to Udbina, than continue with main road D1 in direction Korenica - Plitvice Lakes - Grabovac. Than on the crossroad in Grabovac take right and drive more 3 km and you're comming in Drežnik Grad.