From Osaka (about 7 hours from center of Osaka)
Take the Meishin Expressway to the Komki J.C.T, head up the Chuo Expressway to the Okaya J.C.T, then take Nagano Expressway to the Kosyoku J.C.T and head towards and past Nagano on the Nagano Expressway. The Shinshu Nakano Interchange is the nearest exit to Okushiga Kogen. Get off at the Shinshu Nakano Interchange and follow the signs onto the Shiga Nakano toll road for Shiga Kogen. The toll road runs into Route 292 that takes you to the Shiga Kogen area.

By Train

Okushiga Kogen is about 1.5 hours from Nagano Station by bus or train. 

From Tokyo (about 1.5 hours from Tokyo to Nagano)
From Tokyo Station, take the Nagano Shinkansen ("Asama").
The Shinkansen "Asama" runs regularly throughout the day. Nagano is the last stop of the Nagano Shinkansen. Get off the train at Nagano and take the direct bus to Shiga Kogen. The buses from Nagano to Okushiga Kogen also run throughout the day in the winter season (with 2-4 buses running each in the summer season).  The buses depart from the East (Higashi) exit of Nagano Station from bus stops 3 or 4, and the traveling time is about 70 mins.

From Nagoya - about 3hrs from Nagoya to Nagano
Take the Chuo limited express (Shinano) that departs from Nagoya Station and travels to Nagano (Nagano is the last stop). The traveling time is about 3hrs.  Then from Nagano Station catch the direct bus from the East exit (as above) to Okushiga Kogen.

From Osaka - about 7hrs from center of Osaka
Departing Osaka, catch the Tokai Shinkansen to Nagoya (1hr) and transfer to the Chuo limited express (Shinano) that departs from Nagoya Station to Nagano Station (3hrs).  The traveling time from Osaka to Nagano is about 4hrs.  Then from Nagano Station catch the direct bus from the East exit (as above) to Okushiga Kogen.

From Route 292, head up into the Shiga Kogen highlands and at the main Maruike junction turn left towards Ichinose / Yakebitaiyama and Okushiga Kogen.  You will see this signposted and it will take you directly to Okushiga Kogen.