In reply to petre:
Hi Petre,
I've been ice climbing in Slovenia a few times and really enjoyed what the Alpine valleys have to offer. Early January should be OK, I've been once at that time and it was very cold and snowy (ski approach to the routes). End of January and into February is probably better from my experience.
The area is susceptible to warm thaws from the south, but if you have transport you can just drive west into the Dolomites and find higher starting routes around, say Colfosco. That drive is about 2hrs from Kranjska Gora.
Climbing is like a national sport in Slovenia, and the grading is tough IMO. I didn't do any routes lower than grade IV but there are plenty for you to go at. The local climbers are friendly and helpful, and mostly very, very good.
Hope you enjoy it.......Jeff