Lochaber Midges in May — Risk, Peak Times, Kit
Noticeable at dawn and dusk. Repellent recommended. Ground zero for Scottish midges. Wet, sheltered, west-coast — the trinity that drives the biggest populations in Britain. Glen Nevis, the Mamores, Knoydart and the Road to the Isles are all peak-pressure habitat from late May to mid-September.
Current risk
Lochaber in May: Moderate. Noticeable at dawn and dusk. Repellent recommended.
When they bite
Peak biting windows are dawn 6–8am and dusk 5–7pm. Spring proper. Average highs into the mid teens, lengthening days, and the first warm settled spells. The first midge hatches arrive on the lowest sheltered ground from around mid-month, building rapidly in the last week.
What to wear
- Smidge repellent (75ml)
- Light-coloured long-sleeve baselayer — midges have a strong preference for dark clothing.
Tactical notes
May is the warning month. The first hatches in Lochaber typically arrive around 15-20 May in the lowest, wettest, most sheltered spots — the [Glen Nevis](/glens/glen-nevis) valley floor below the gorge, the Steall meadows, the river edges near Polldubh, the Kinlochleven path, the Inverie waterfront on Knoydart. By the end of the month an evening at the Glen Nevis campsite in still warm overcast weather is no longer pleasant outdoors.
The geography of the early hatches matters. Below 300m on sheltered west-facing slopes — bad. Above 500m and on any exposed ridge — still fine. The [Ben Nevis](/hillwalking/munros/ben-nevis-beinn-nibheis) Tourist Track and the Mamore high ridge are pretty much midge-free even at the end of May. The Knoydart approaches (over the Mam Barrisdale to [Barrisdale bothy](/bothies/barrisdale) or in to [Sourlies](/bothies/sourlies)) start to show midges in the bothies at dusk in the last week.
For planning: don't postpone a May Lochaber trip because of midges — the activity is patchy and well below peak. But carry Smidge from mid-month, and pack a head net if you're camping below 400m. The Loch Ossian bothy at Corrour is at 415m and starts showing midge activity in late May; the Glen Nevis tent pitches are worse and earlier. [Glen Coe](/glens/glen-coe) village restaurants and pubs are still working as outdoor evening spaces but the windows are closing.
The end-of-May / start-of-June window is when the population transition kicks in hard. Plan trips for mid-May (still good) over late May (closing fast).