The first cross country ski tracks will be open in Ruka and Kuusamo in the middle of October, I learnt today! 10th October in Kuusamo centre and 23rd in Ruka. Apparently they stored 10,000 cubic meters of snow for each slope over the summer and they will be opening up 2x 2km long tracks.
The temperature has cooled off a lot here now (I live near Ruka) and there is talk of the downhill ski slopes being opened up early as well. As long as the nights are below freezing it is possible for them make snow for the slopes. I'm crossing my fingers for an early ski season :)