In reply to mikecvt: I have been in spring summer and autumn. Obviously there can be more snow about in the spring but its a good time to go as its colder and the conditions for climbing can be better. I've always managed to get plenty done, although snowfall can make for short delays. You just need plenty of experience at assessing the conditions. Any snow that falls soon melts in May. It's a great country and you'll have a great time.