The photo is from 16th January 2018 after a heavy fall of snow.  However the first snow can arrive as early as the end of October.  In winter conditions you can still drive up Vollen skog road but if there is a lot of snow, or minor roads are icy, it is possible to use the alternative route.  Turn off Slemmestadveien into Vollenveien.  Continue 3 more minutes up the road past Vollenskog and turn into Vollenlia.  Then take the first road on your left into Golia and down to Vollen Skog.  Left again and my house is on the right.  It is best to back down into the drive.