Purple Mountain Loop

Overview

This is Killarney’s big, committing ridge day: a 9.7‑mile (15–16 km) loop with about 3,100 feet of climbing over Purple Mountain (832 m) and Tomies. Expect a serious, rewarding outing with unmarked stretches, short scrambly steps, steep scree, and boggy patches. On a clear day the 360° views over the Killarney Lakes, the Gap of Dunloe, and the MacGillycuddy’s Reeks—including Carrauntoohil—are superb. Plan 5.5–6.5 hours for the full loop, longer if conditions are poor or you linger on the tops.

Route at a Glance

Most hikers start at Kate Kearney’s Cottage at the north end of the Gap of Dunloe (parking, café, restrooms). Walk the Gap road to the Head of the Gap, then leave the tarmac to climb beside a stream to Lough Glas. A steep pull gains the ridge, where you tag the 793 m top, Purple Mountain (832 m), then traverse over the 757 m top to Tomies. Descend NNW via Tomies Rock to tracks and minor roads back to the start. Parts are pathless; some stones bear yellow dots, but do not rely on them. OSI Discovery Series Map 78 covers the area, and an offline GPS track is smart backup.

What You’ll See

The upper slopes are made of shattered red sandstone and scree—likely the origin of the mountain’s “purple” name—dropping to cliff‑edged corries and string‑of‑beads loughs (Black Lake, Cushnavally, Auger, Black Lough, and Lough Glas). From the ridge, the lake country spreads below and the Reeks line the skyline. In good light, this is one of the best photo vantage points in the park.

Difficulty and Hazards

This loop is graded hard. The final inclines are tough, footing is often loose or boggy, and the ridge can be extremely windy even when it’s calm in the valley. Visibility can collapse fast in mist. Several sections are unmarked and require confident navigation. There are high, cliffy corries near the summits—mind your spacing and footing.

Tips and Tricks

• Footwear: stiff, grippy boots; poles help on scree and bog.
• Navigation: carry a map and compass and download an offline route; phone signal is patchy.
• Water/food: none on route—bring what you need.
• Logistics: start/finish at Kate Kearney’s; parking in the Gap itself is limited and awkward. Expect jaunting cars and walkers on the road—go early and share courteously.

Shorter Alternatives

• Summit out‑and‑back: From the Head of the Gap via Lough Glas to Purple Mountain and back. Fit hikers report roughly 2.5–3.5 hours in good conditions; still steep and partly pathless.
• Lower‑level fallback: the Black Lough area offers a shorter, moderate loop if weather turns.

Best Times to Hike

Clear days make the hike—save it for good visibility. Summer mornings give the most reliable light and calmer air; autumn afternoons trade some crowds for richer colors. Start early to bank daylight, especially outside summer. Waterproof layers are essential year‑round; it’s colder and windier on the ridge than at the trailheads.

Access and Fees

Killarney National Park has no entry fee, and you don’t need a ticket for this hike. Facilities are at Kate Kearney’s; options are limited once you leave the road.