al78 wrote:The slight problem with planning Scottish highland trips is I want to pick a time when the weather is favourable, outside of peak midge activity, and at a time of year when getting to the higher summits (1000m+) isn't going to be hampered by snow and ice, and ideally not having to worry about stalking activities. That only leaves mid May to late June (maybe just June for the highest Cairngorm summits), unless September is not so bad for midge activity.
I understand your reasoning, but I reckon you might be over-estimating the midge issue. In a decade of hillwalking in Scotland I can count the number of days I've encountered significant numbers of midges on one hand. Sure, they can be bad, but the chance is low, especially east of the A9 (where you are going).
Anecdotally I would say that July and September have similar numbers of midges (August being undoubtedly the worst month in an average year - but still nothing to get too bothered about). Additionally I've found that the midge season seems to focussed a few weeks later in the year in the Cairngorms than on the west coast, so July in the Cairngorms might well be OK (and probably better than September).
This is of course just based on my own experience and from what I've seen on this forum, so it may not be factually correct!