Overview
The Bluestack Mountains – locally known as the Croaghgorms – form a dramatic granite spine across southern County Donegal. Stretching between the Barnesmore Gap and the coastal lowlands, the range acts as a natural boundary separating Donegal Town and Ballyshannon from the northern Gaeltacht communities around Dungloe and Letterkenny. At 674 m, Croaghgorm is the highest summit, while Silver Hill (600 m) holds the distinction of being Ireland’s smallest peak to meet the Simms classification. The terrain shifts from gentle, heather-dusted foothills to deep river valleys and boggy plateaux, creating a landscape that rewards steady walkers and keen observers alike.
Glacial Origins & Local Lore
The Bluestacks owe their rugged character to the last Ice Age. Roughly 12,000 years ago, massive ice sheets ground against the ancient granite bedrock. The softer rock was scraped away, but the resistant granite held firm, leaving behind sheer boulders, polished rock pavements and steep corries that still define the skyline today. The Irish name Croaghgorm translates to “the blue mountain,” a reference to the violet-grey tint the peaks take on at dawn and dusk.
Historically, the range served as a defensive barrier and a natural trade divide. The Barnesmore Gap has long been the primary passage for goods and travellers moving between north and south Donegal. Scattered across the higher ground are quiet reminders of early human presence, most notably the mountain graveyard at Disert. This isolated burial site, surrounded by open moorland, has inspired generations of local stories about wandering spirits and hidden fairy rings. The trail itself was developed by the Bluestack Environmental Group, launched in 2000 with EU Peace and Reconciliation funding, and later upgraded to National Long Distance Trail standard.
The Bluestack Way: Route & Stages
The official trail covers 65 km and is graded as moderate. While the route spans six OS Discovery Series map sheets, most walkers break it into three manageable stages, typically completed over a weekend or a long weekend. The path is clearly waymarked with a yellow arrow on a black background, and both trailheads offer free roadside parking.
| Stage | Route | Key Highlights |
|---|---|---|
| Day 1 | Donegal Town → Lough Eske | Lakeside conservation zone, salmon and freshwater pearl mussels, optional 5.5 km loop around Loch Iascaigh |
| Day 2 | Lough Eske → Disert | Gradual ascent through foothills, ancient graveyard at Disert, open ridge walks with wide valley views |
| Day 3 | Disert → Ardara | Rolling moorland, sweeping sightlines to the western coast, finish at The Diamond in Ardara |
Dogs are welcome on public land but must be kept on a lead across private sections, the first of which begins near Owenboy when heading north from Donegal Town. For navigation, carry OS Discovery Series 1:30 000 maps (Sheets 1, 2 & 3) or download the route details from the Sport Ireland trail portal.
Wildlife & Landscape Features
The Bluestacks are one of Donegal’s most active wildlife corridors. On calm mornings, golden eagles often circle the thermal updrafts along the ridges. The autumn months bring red deer stags to the bogs for the rut, while otters and red squirrels favour the hazel thickets and riverbanks lower down.
Water features play a central role in the scenery. Lough Belshade, tucked against the western flank of Croaghgorm, is a remote, mirror-calm lake that reflects the surrounding granite. Further south, Lough Eske anchors the first stage of the trail. Its shoreline is lined with walking paths, and the lake itself supports healthy populations of Atlantic salmon and the endangered freshwater pearl mussel. Petrifying springs nearby leave delicate mineral deposits on fallen branches, a quiet geological curiosity worth spotting.
Practical Information
- Length & Grade: 65 km, moderate. Suitable for walkers with a reasonable fitness level and experience on uneven terrain.
- Start & Finish: The trail begins at The Diamond in Donegal Town and concludes at The Diamond in Ardara.
- Maps & Guides: OS Discovery Series maps (Sheets 1, 2, 3) are essential. The official Sport Ireland page provides downloadable route cards.
- Accommodation: B&Bs, guesthouses and self-catering cottages are plentiful in Donegal Town, Ardara and the villages along Lough Eske. Designated camping sites operate near the lake during summer.
- Facilities: Public toilets are available at both Diamonds. Water sources are reliable near the lakes and streams, but carry at least 1.5 litres per person per day.
- Fees: The trail is free to walk. Parking at both trailheads is also free.
Getting There & Seasonal Advice
The nearest motorway access is via the N13 to Donegal Town and the N15 to Ardara. Bus Éireann routes 480 and 490 serve the trailheads, though Sunday services are limited. Donegal Airport (CFN) is roughly 30 km north, while Derry Airport (LDY) is about 70 km away.
The trail is open year-round, but late May through early October offers the most reliable conditions. Winter walks demand sturdy boots, waterproof layers and a reliable compass, as peat bogs can freeze and visibility drops quickly. Autumn delivers rich bracken colour and active wildlife, while spring brings heather blooms and nesting birds. Check local weather forecasts before setting out, and always inform someone of your planned route and expected return time.
For a post-walk meal, Ardara’s historic market square is a short stroll from the trail’s end, with the Ardara Heritage Centre nearby for a look at regional crafts and local history. Keep your pace steady, carry a fully charged phone, and you’ll find the Bluestack Way rewards careful preparation with quiet, unspoiled mountain scenery.