Errigal Mountain
Errigal, a white quartzite cone soaring to 751 m, is Donegal's iconic summit. A 3 to 4-hour hike leads through One Man's Pass to sweeping views of the Atlantic and surrounding lakes.
Errigal is the highest peak in County Donegal, standing at 751 metres. Its grey-white quartzite cone, visible for dozens of kilometres in every direction, dominates the wild landscape of Gweedore. It's a demanding yet accessible hike, rewarded with expansive views across lakes, bogland and the Atlantic. The summit comprises two narrow ridges separated by a vertiginous passage known as "One Man's Pass".
Quick facts
- Access: car park at the mountain's base on the R251, between Dunlewy and Gweedore.
- Admission: free.
- Suggested duration: 3 to 4 hours round trip depending on pace.
- Difficulty: moderate to challenging — rocky terrain and steep slopes; hiking boots essential.
- What to wear: waterproof clothing and warm layers even in summer; wind at the summit can be fierce.
- Accessibility: not accessible — mountainous terrain without facilities.
What you'll see
Errigal's flanks are covered in white quartzite scree that glimmers in sunlight. As you climb, Dunlewy and Nacung lakes gradually emerge, along with the Derryveagh boglands and, on clear days, the Aran Islands offshore. Two cairns mark the twin peaks at the summit. Between them, "One Man's Pass" — a narrow ridge — offers dramatic drop-off views on either side.
History and context
Errigal is part of the Derryveagh massif, within an Irish-speaking region (Gaeltacht). Its name derives from Irish An Earagail, meaning a church or oratory. The mountain has been central to Donegal's culture and identity for centuries. It features in local mythology and remains a visual landmark for coastal communities.
Highlights
One Man's Pass
This narrow rocky ridge connects the two summits. It demands attention and good balance, but remains passable for a cautious hiker. Views from either side are breathtaking: bogland to the east, the Atlantic to the west.
The summit panorama
In clear weather, your gaze stretches across Donegal's mountains, the Aran Islands, Scotland and occasionally the Connaught mountains. Dunlewy Lake below contrasts beautifully with the white quartzite.
Evening light
In late afternoon, the quartzite takes on golden and pink hues. Hikers setting out early can descend before dark while still enjoying this low-angle light.
Photography tips
Morning light illuminates the mountain's eastern flank, bringing out the white quartzite's brilliance. Late afternoon offers golden light over Dunlewy Lake from the summit—particularly striking. From the R251, Errigal's cone sometimes reflects in surrounding lakes, a classic roadside angle.
Location and access
Errigal lies in north-west County Donegal, roughly 25 km north-west of Letterkenny. The trailhead car park sits on the R251 between Dunlewy village and Gweedore. No regular public transport serves the mountain's base; a personal vehicle or rental car is necessary. Dunlewy Lake and Dunlewy Centre lie just minutes' drive away.
Nearby attractions
- Dunlewy Lake — glacial lake at Errigal's foot, ideal for a post-hike rest.
- Glenveagh National Park — vast wilderness park with castle, gardens and red deer, about 20 km east.
- Muckish Mountain — another Donegal landmark with distinctive tabletop profile, visible from Errigal.
- Slieve League Cliffs — some of Europe's highest sea cliffs, in south Donegal.
Frequently asked questions
May to September brings long daylight hours and more stable weather. Summer in Donegal remains unpredictable—always pack a waterproof. Avoid days with thick fog, which erases views and makes navigation difficult.
Rocky terrain and steep slopes make it challenging for young children. Teenagers comfortable with hiking might attempt it with an experienced adult. One Man's Pass requires caution and balance.
Yes, the main trail is well-marked from the R251 car park. A topographic map or hiking app is still recommended, as fog can roll in quickly and cause disorientation.
The ridge is narrow and exposed but passable for an attentive hiker in dry conditions. In high wind or wet weather, extreme caution is needed. Some hikers choose to turn back before this section.
None. The summit is public natural space. Protect your gear from wind, which can be intense, and secure your camera on the ridge.
Yes, both sites are about 20 km apart. Plan a full day: Errigal takes 3 to 4 hours, and Glenveagh deserves at least 2 more hours.
Interested in this visit?
We can include it in your personalised itinerary.
