wild camping
Scottish Midge Survival Guide: When, Where and How to Beat Them
Scottish midges are the biggest unforced error in west-coast outdoor planning. Here's the biology, the season, the weather thresholds and the kit that actually works.
Quick Summary
- Scottish midges are active from late May to mid-September — peak biting is June and July on the west coast and in the Highlands
- They can't fly in wind above 6mph — so a high, exposed pitch on a ridge or col is effectively midge-free
- They're inactive below 10°C — and worst in still, humid conditions at dawn and dusk
- Plan around them — our Midge Forecast will give you a seven-day risk score for any Scottish postcode
“I'd forgotten about the midges” is the single most common opening line in complaints about Scottish west-coast trips. Forgetting about the midges is always a mistake. Planning around them is straightforward once you understand three numbers: 6mph, 10°C, and the dates of the biting season.
Quick Answer: The Scottish midge (Culicoides impunctatus) is active from late May to mid-September, peaking in June and July on the west coast and in the Highlands. Midges cannot fly in wind above 6mph (10kph) and are inactive below 10°C, so exposed pitches above 300m and breezy days are largely midge-free. The most effective defences are a head net, DEET or picaridin-based repellent (Smidge is the picaridin standard), and choosing your location and timing around the weather rather than against it.
What the Scottish midge actually is
The “Scottish midge” is Culicoides impunctatus, a two-millimetre biting fly that thrives in the specific conditions of the Scottish west coast and Highlands: damp, peaty, sheltered, mild. It is one of more than thirty Culicoides species in Britain, but impunctatus accounts for the overwhelming majority of human bites in Scotland.
Only the females bite. They need a blood meal to produce eggs. A single midge bite is trivial, but midges swarm — and the combination of thousands of bites, the irritant they inject, and the simple inability to sit still outside a tent makes them by some distance Scotland's most significant outdoor nuisance.
The biology in three numbers
| Threshold | Effect | Practical consequence |
|---|---|---|
| 6mph (10kph) wind | Midges cannot fly | Exposed ridges, cols and summits are largely midge-free |
| 10°C temperature | Inactive below this | Shoulder-season trips and winter are biting-free |
| Dawn and dusk | Peak biting activity | Pitch late, strike early |
Source: Biting Midges & the Scottish Midge — Advanced Pest Solutions; Highland Midge Forecast archive.
When the season runs
The season follows soil temperature, which is why it varies year to year by a fortnight or so.
- Late May: First adults emerge on the west coast. Biting is light.
- June: Peak first-generation emergence. Biting is severe in sheltered areas.
- July: Second generation. This is the worst month of the year on the west coast.
- August: Still severe in sheltered areas, beginning to ease in exposed spots.
- Early September: Tail end. Tolerable on most days.
- Mid-September onwards: Effectively finished for the year.
- October to April: No midges.
The east coast is genuinely different. Aberdeenshire, Angus, the Lothians, the Borders east of the M74 — none of these are midge-free, but they are a fraction of the west-coast intensity. If a midge-free summer trip is the priority, head east.
Where they're worst — and where they aren't
Midge density is a function of habitat. Three factors drive it:
- Peat and damp ground — larvae develop in wet peat, so blanket bog country is worst
- Shelter from wind — woodland, lochside hollows, glen floors
- Humidity — still, overcast, post-rain conditions
The worst combination is a sheltered, peaty lochside in the west Highlands on a still, overcast evening in July. The best combination is a windswept ridge above 500m in the eastern Cairngorms in September.
High-risk locations
- Lochside pitches anywhere west of the A9
- Glens in Wester Ross, Sutherland, Knoydart, Ardnamurchan
- Forestry and woodland across the west coast
- Sheltered beaches on the west mainland and Inner Hebrides
Low-risk locations
- Ridges and summits above 300m anywhere there's a breeze
- East coast in general, from East Lothian to Caithness
- The eastern Cairngorms at altitude
- Any exposed headland
- Open machair on the Outer Hebrides
Try it yourself
Our free Midge Forecast
gives you a seven-day midge risk score for any Scottish location, based on real weather data — wind speed, temperature and time of day — so you can see at a glance whether your campsite is going to be bearable before you leave the car park.
No sign-up required.What actually works: kit and tactics
Head nets
A fine-mesh head net (sometimes called a “midge net” or “bug net”) is the single most effective piece of anti-midge equipment you can own. It weighs 20 grams, costs £3–£8, and completely stops midges reaching your face and neck.
Look for one with a stiff brim or drawcord that keeps the mesh off your skin — midges will bite through fabric that's touching you. The all-over mesh beanie-style nets are better than the simple tube nets for this reason.
Repellents
The two chemistries that work on Scottish midges are DEET and picaridin (icaridin). Everything else — citronella, lavender oil, wrist bands, ultrasonic devices — is essentially ineffective in field conditions.
| Repellent | Active ingredient | Notes |
|---|---|---|
| Smidge | 20% picaridin | Skin-safe, non-greasy, widely stocked in Scotland, the default recommendation |
| Jungle Formula Maximum | 50% DEET | More effective than Smidge against the worst swarms, but damages plastics |
| Avon Skin So Soft | Not a registered repellent | Folk remedy — sometimes works, sometimes doesn't, not reliable at peak density |
For most trips, Smidge is the sensible default. In peak July conditions in the west, a 50% DEET product will outperform it — bring both if you're camping in a known midge hot-spot.
Clothing
- Long sleeves and long trousers in lightweight, tight-woven fabric
- Light colours are less attractive to midges than dark
- Tuck trousers into socks or use gaiters
- A buff worn up to the ears adds a second layer of defence with no weight penalty
Tent and camp tactics
- Pitch at least 50m from standing water
- Choose the windward side of any hill, ridge or col
- Keep the tent door zipped when you're not actively going in or out
- Cook outside the porch if midges are thick — cooking in the vestibule will pull dozens of them in
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Common mistakes
- Assuming the repellent is a force field. Repellent buys you time; it doesn't make you invisible. In peak conditions you'll still need a head net.
- Forgetting about boots and socks. Midges will bite ankles through thin sports socks.
- Camping in a glen floor because it's sheltered from wind. Shelter from wind is shelter for midges. Go higher.
- Staying after sunrise to “have a coffee in camp”. Sunrise is prime biting hour. Leave, have coffee in the car.
- Writing off Scotland in July. East coast and above 400m on any breezy day, it's fine. You just need to pick your spot.
Try it yourself
Our free Gear Checklist Generator
includes a summer wild camping kit list with midge-specific items built in — head net, repellent, long sleeve base layer, waste bags — so you don't arrive at the car park having forgotten the one £5 item that matters.
No sign-up required.Scotland vs the rest of Britain
England and Wales have biting midges too, but nothing on the scale of the west Highlands. The combination of blanket bog, high rainfall, mild temperatures and low wind in Scottish west-coast summers is uniquely favourable to Culicoides impunctatus. Cornwall, the Lake District and Snowdonia all have some midge activity, but none approach the density of Ardnamurchan on a July evening.
| Region | Midge severity (peak season) |
|---|---|
| Scottish west coast | Severe |
| Scottish Highlands (interior) | High |
| Scottish east coast | Low to moderate |
| Northern England | Low |
| Wales | Low |
| Southern England | Minimal |
Frequently Asked Questions
When is midge season in Scotland?
Scottish midge season runs from late May to mid-September, with peak biting in June and July. The last week of June and the first three weeks of July are typically the worst. Outside this window there are effectively no midges.
Where in Scotland is worst for midges?
The west coast and Highlands, particularly sheltered lochside and woodland locations below 300m. Wester Ross, Sutherland, Knoydart and Ardnamurchan have the highest densities. The east coast — Aberdeenshire, Angus, the Lothians, the Borders — is dramatically less severe.
What is the best midge repellent for Scotland?
Smidge (20% picaridin) is the widely stocked default in Scotland and works for most conditions. In peak July density on the west coast, a 50% DEET product will outperform it. A head net is more effective than any repellent and weighs almost nothing — carry one regardless.
Do midges go away in wind?
Yes. Scottish midges cannot fly in winds above 6mph (10kph). An exposed ridge, col or summit on a breezy day is effectively midge-free even at peak season. This is the single most important fact for planning west-coast camping trips.
Are midges active at night?
Midges are most active at dawn and dusk. Inside a tent at midnight with the doors zipped, you're safe. The classic Scottish wild camping pattern is to arrive after 7pm and strike camp before 8am — that puts you inside the tent during the hours they're worst.
Do Skin So Soft or citronella repel Scottish midges?
Not reliably. Avon Skin So Soft is the best-known folk remedy and sometimes works in light conditions, but breaks down against peak-season west-coast swarms. Citronella, lavender oil, wrist bands and ultrasonic devices are effectively useless. Stick with DEET or picaridin.
Related Articles
- Wild Camping in Scotland: What the Access Code Actually Means — the legal basis for Scottish wild camping
- What to Wear Hillwalking in Scotland — layering for Scottish conditions, including midge-friendly fabric choices
- Wild Camping Hub — regional wild camping guides and kit advice
- Hillwalking Hub — hill walking across Scotland's Munros, Corbetts, Grahams and Donalds
- OutdoorSCOT Tools — free planning tools for Scottish trips
This article is for informational purposes only and does not constitute medical or professional guidance. Individual reactions to midge bites vary. If you experience a severe reaction to insect bites, seek medical advice. Product recommendations are based on field experience and published field trials — no manufacturer has influenced the content. OutdoorSCOT is not liable for any incidents arising from the use of this information.
Sources
- Highland Midge — Natural History Museum
- Midge Forecast Scotland — APS Biocontrol
- Culicoides impunctatus: biology and control — Medical and Veterinary Entomology
- Scottish Outdoor Access Code — NatureScot