Mount Errigal is a demanding but manageable hike for confident walkers in dry, calm conditions. At 751 metres, it is County Donegal’s highest peak and the tallest mountain in the Derryveagh range.
The route is short on paper, but it packs in boggy ground, a sustained climb, loose stone and an exposed summit ridge. Good footwear, sensible weather judgment and a willingness to turn around are more useful here than bravado.
Known in Irish as An Earagail, the mountain rises near Gweedore and Dunlewy in northwest Donegal. Its sharp quartzite profile looks different from almost every angle, and its pale rock can take on a pink tone in low evening light.
Mount Errigal is the highest of Donegal’s Seven Sisters, a local name for a line of prominent peaks that also includes Muckish, Crocknalaragagh, Aghla Beg, Ardloughnabrackbaddy, Aghla More and Mackoght. Mackoght is often called Little Errigal or Wee Errigal, and sits close to its larger neighbour.
Errigal’s shape is part of the appeal. Seen from the road near Dunlewy, it has a clean, pointed silhouette. From other sides, it appears broader and more complex. On clear days, the mountain’s reflection in Dunlewy Lough is one of Donegal’s classic landscape views.
The name An Earagail is generally linked to an old Irish word for an oratory or place of prayer. There is no surviving oratory on the mountain, but the name gives this very physical hike a little extra atmosphere.
The core Mount Errigal route is generally described as about 4 kilometres, with roughly 500 metres of ascent, and it can take a regular hillwalker a little over two hours. Allow more time if you are moving cautiously, stopping for photographs or continuing along the summit ridge.
Route measurements vary because hikers do not all turn around at the same point. Some accounts include an out-and-back trip to the far summit across One Man’s Pass, while others focus on the main ascent and descent. A realistic planning window is two to three and a half hours.
The hike is not a long-distance walk, but it is not a casual stroll either. The upper mountain has steep ground and loose scree, so descending can feel as technical as climbing up.
The usual starting point is the Mount Errigal car park on the R251, near the mountain’s eastern side. It is within driving distance of Gweedore, Falcarragh, Dungloe, Dunfanaghy and Letterkenny, making it an achievable half-day outing for people touring Donegal by car.
Parking is limited, with space for roughly 10 to 12 cars. Arrive early on fine summer days if you want a straightforward start, especially when clear weather is forecast. Do not block the road or assume that a narrow roadside space is suitable for parking.
The approach now includes a constructed path across ground that was once especially wet and boggy. It makes the lower section easier to follow, though wet weather can still leave mud and standing water around the trail.
The walk begins across open bogland, passing heather and gorse before the mountain steepens ahead. The engineered path takes some sting out of the opening section, but it does not remove the need for waterproof footwear.
Above the lower approach, the climb becomes steeper and rockier. Stone steps assist on part of the ascent, yet there is still loose material underfoot. Keep your pace controlled and leave space between your group and the people ahead, particularly where stones can shift.
The final section is the serious bit. The summit area is exposed, and the ridge known as One Man’s Pass is narrow, rocky and vulnerable to wind. It leads toward the adjacent summit and offers a fuller experience of the mountain, but it is optional. Skip it if visibility is poor, the wind is strong, the rock is wet or the route is crowded.
Mount Errigal is an exposed mountain, so conditions can change quickly even when the car park feels pleasantly warm. Wear sturdy, grippy hiking boots, take warm and waterproof layers, and carry water and a charged phone. Mobile coverage can be unreliable in the area, so do not depend on it for navigation.
Proper hiking boots are especially helpful on the loose upper slope and slick descent. Trainers may be fine for a dry, flat trail, but Errigal’s scree, rock and wet ground demand more support and grip.
Clear, dry and relatively calm weather gives you the safest and most enjoyable conditions. The mountain is particularly exposed to wind, and cloud can arrive quickly around the summit. A forecast that looks merely acceptable in a nearby town may feel very different several hundred metres higher up.
Summer brings longer daylight and usually the busiest trailhead. Spring and autumn can be quieter, but wet ground, shorter days and fast-moving weather require more preparation. Winter conditions are for properly equipped, experienced mountain walkers, especially when snow or ice is present.
For photographs, early morning can offer quieter paths and softer light. Late-day light can bring out the quartzite’s warmer tones, but do not let a sunset plan leave you descending in darkness. Carry a headtorch if there is any chance your walk will run late.
On a clear day, Mount Errigal offers a wide sweep across the Derryveagh Mountains, with Donegal’s rugged interior spread below. Dunlewy Lough is a standout feature, and the surrounding Seven Sisters help explain why this corner of the county feels made for hillwalking.
Views are a bonus, not a guarantee. If cloud closes in, treat the hike as a navigation and safety decision first. The sensible call is often to enjoy the lower slopes, take a few photos and save the summit for another day.
Dunlewy Lough is the natural first stop before or after the hike. Its waters sit beneath Errigal’s slopes and provide one of the clearest roadside views of the mountain, particularly when the surface is calm.
Glenveagh National Park is another strong option for a longer Donegal itinerary. The park includes Glenveagh Castle and gardens, plus walking routes around Lough Veagh. It offers a gentler contrast after the steep ground of Errigal.
Muckish is another of the Seven Sisters and has a very different profile from Errigal. It is best treated as a separate hike on another day, not an add-on after a summit attempt unless you are already an experienced, well-prepared hillwalker with plenty of daylight.
Staying around Gweedore or Dunlewy gives you a better chance of choosing a clear-weather window instead of forcing the hike into a poor forecast. It also makes an early start less of a logistical puzzle, which is useful when the small car park fills quickly. If you are basing yourself in Letterkenny in autumn 2026, Mount Errigal Hotel has Some Guys Have All The Luck – Rod Stewart Story on 6 September and The Highstool Prophets on 25 September; Rock N Christmas follows there on 4 December.
Mount Errigal is a moderate-to-strenuous hike with a steep, loose and exposed upper section. It suits prepared walkers with sturdy footwear and good weather, but it is not ideal for anyone uncomfortable on rocky slopes or narrow ridges.
Mount Errigal stands at 751 metres, or 2,464 feet. It is the highest mountain in County Donegal and the highest point in the Derryveagh Mountains.
Fit beginners can hike the lower route and may reach the summit in calm, dry, clear conditions with careful pacing. Beginners should avoid One Man’s Pass if it feels intimidating and should not attempt the mountain in high wind, rain, snow, ice or poor visibility.
Mount Errigal is a public mountain hike, and no entry charge is associated with walking the route. Plan for your own transport, food, equipment and any accommodation costs.
Yes. Dunlewy Lough is one of the best-known places to view Mount Errigal, and calm, clear conditions can produce a reflection of the mountain on the water.
Yes, Mount Errigal is worth hiking if you want a short, steep Donegal mountain day with a properly wild finish. It delivers a memorable summit without requiring an all-day expedition, but it expects you to respect the conditions.
Take the forecast seriously, wear the right footwear and treat One Man’s Pass as a choice, not a target. Do that, and Donegal’s highest mountain is likely to be one of the strongest walks on your trip.
Matt Hook is a Canadian writer of Scottish and Irish heritage. He built his writing career creating detailed gaming guides, turning complex mechanics, history and lore into useful information for readers. Matt brings that same research-focused approach to Ireland Wide, where he writes about Irish travel, heritage, history and culture. He also holds CMA and CPA designations as a professional accountant, giving him a strong background in research, accuracy and attention to detail.
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