Slieve Bloom Mountains - Walking Guide for Ireland's Quiet Range
The Slieve Bloom Mountains rise from the flat midlands of Offaly and Laois like an island of high ground. They are old - 300 million years of old red sandstone - and they are quiet. At 527 metres, Arderin is the highest point. It is not dramatic by Kerry or Donegal standards. The point is isolation. On a weekday, you are unlikely to meet another walker.
This is Ireland's most underrated walking range. The trails pass through blanket bog, mature forestry, and mountain valleys carved by rivers. Glenbarrow waterfall is the most accessible highlight - a 45-minute loop from the car park. The Slieve Bloom Way, a 77-kilometre looped trail, covers the full range for those who want a multi-day walk.
No crowds, no queues, no admission fees. Just open mountain and bog. If that appeals, the Slieve Blooms deliver.
What to Expect
The Glenbarrow waterfall walk is where most visitors start, and it is a good introduction. You park at the Glenbarrow car park near Rosenallis and follow a marked trail along the river. The waterfall drops through a wooded glen - not enormous, but the setting is beautiful. The loop takes about 45 minutes at a steady pace. It is the most accessible walk in the range and suitable for most fitness levels.
Beyond Glenbarrow, the character of the mountains changes. Ridge walks take you above the tree line onto open blanket bog. The views stretch across the midlands in every direction - flat farmland and bog to the horizon, with the mountains rising above it all. On a clear day, you can see the Galtees and the Comeraghs to the south.
The Slieve Bloom Way is the headline trail - a 77-kilometre loop that circles the entire range. Most walkers break it into sections over two to three days. The trail passes through forestry plantations, open moorland, and river valleys. It is waymarked throughout, though some sections through the bog can be very wet underfoot. Proper waterproof boots are not optional.
The honest negative: facilities are limited. There are no cafes, no shops, and no shelters on the mountains. The nearest services are in the villages of Kinnitty, Mountrath, or Clonaslee - none of which are large. Weather changes fast at altitude, and the bog sections can turn a walk into a wade after heavy rain. Bring everything you need with you.
That said, the lack of infrastructure is also the appeal. You are walking through a landscape that feels genuinely remote, even though Dublin is only 90 minutes away. The Slieve Blooms were designated as Ireland's first eco-tourism destination, and the description fits.
How to Get There
The Slieve Bloom Mountains sit on the Offaly-Laois border. Multiple trailhead car parks provide access from different sides of the range. Glenbarrow (near Rosenallis) is the most popular starting point. Kinnitty and Monicknew car parks access the Offaly side.
From Dublin, the drive takes about 1.5 hours via the M7 motorway. Kinnitty is reached via the N52 from Tullamore. Mountrath is on the N7/M7 corridor.
A car is essential. There is no public transport to the trailheads. The roads to the car parks are narrow but passable. A rental car is the only practical option for visitors.
The Slieve Blooms combine naturally with Birr Castle (20 minutes from Kinnitty) or Lough Boora for a full day in Offaly.
Where to Stay Nearby
Accommodation near the Slieve Blooms is limited but characterful. Kinnitty on the Offaly side and Mountrath on the Laois side are the closest villages with options.
Atmospheric Gothic Revival castle in the foothills of the Slieve Blooms. Good bar, solid restaurant, and the mountains are on the doorstep.
Check availability →What Else is Nearby
A Note on the History
The Slieve Bloom Mountains are composed of old red sandstone, formed around 300 million years ago. They are among the oldest mountains in Ireland. Erosion has worn them down from what were once much higher peaks - the rounded, gentle profiles you see today are the product of deep time.
The blanket bog that covers the upper slopes is an ecosystem in its own right. Sphagnum moss, heather, and cotton grass dominate. The bog has been forming for thousands of years and acts as a significant carbon store.
The range was designated as Ireland's first eco-tourism destination in 2003, recognising both its ecological value and its potential for low-impact recreation. The Slieve Bloom Way was one of the first national waymarked trails established in Ireland.
Frequently Asked Questions
