There are no hostels in Valmontone but there are other types of accommodations...

"In the Roman hills at 30 minutes from Rome, comfortable train or motorway, between Tivoli, Palestrina, and Valmontone Castelli Romani, two rooms in B & B, welcoming and comfortable.
Our B & B is for those who love to enjoy the wonders of Rome and charm of his' Roman ', full of history, civilization and folklore.
For lovers gather in the evening in the quiet of a villa surrounded by greenery, where they are available to the rest of the guests two rooms and comfortable
For the morning...