Fala Knowe, Allermuir Hill, Windy Door Nick and Castle Knowe Loop

This medium-grade loop in the Pentland Hills packs a lot into roughly 7 km / 4.3 miles, with about 300 m / 985 ft of ascent. Expect a route that feels bigger than the numbers suggest: short, steep pulls, exposed high ground, broad views over Edinburgh and the central Pentlands, and a mix of hill paths, grassy tracks, and potentially wet or muddy sections around the lower flanks. Allermuir Hill is one of the closest substantial Pentland summits to Edinburgh, and its high point is known for wide views over the city, the Firth of Forth, and deeper into the range. (walkhighlands.co.uk)

The route is best understood as a rolling circuit linking several named features rather than one long continuous climb. From the start, the ascent usually builds quickly toward the shoulder of Allermuir Hill, where the gradient becomes more sustained. Wind exposure is often the main challenge here, especially around Windy Door Nick, which lives up to its name on unsettled days. Even in fair weather, the open ground can feel much cooler than the city below, so extra layers, waterproofs, and secure footing are worth planning for. Reports and route notes for this part of the Pentlands regularly mention boggy or muddy ground in places, particularly on side paths and lower traverses. (pentlandfriends.org.uk)

What the route feels like on the ground

A typical outing begins near one of the eastern Pentland access points such as Swanston or Hillend, both on the south side of Edinburgh. Swanston car park is listed by the Pentland Hills Regional Park at EH10 7DS, and Hillend Upper car park at EH10 7DU. If your route file places the start near the ski slope side, the nearest significant landmark is the Midlothian Snowsports Centre, Biggar Road, Hillend, Edinburgh EH10 7DU. (pentlandhills.org)

The first section usually gains height steadily on clear paths heading toward Allermuir Hill. This is one of the most popular hills in the range, so the line on the ground is often obvious, but the climb can still feel sharp for the first 1.5 to 2 km / 0.9 to 1.2 miles. Near the summit area, expect a more open, rounded hilltop with a cairn, trig point, and a view indicator. The reward is immediate: Edinburgh spreads out to the north, while the higher Pentland summits rise to the southwest. (walkhighlands.co.uk)

From there, the route trends toward Windy Door Nick, a col that can be blustery and surprisingly exposed. This middle section is where the walk becomes more varied. Instead of one simple up-and-down, you move across connecting ground between hill features, with short descents and re-ascents that add to the overall effort. Fala Knowe and Castle Knowe give the loop a more undulating character, and the paths here can be less straightforward than the main summit line, especially in mist. For navigation, carrying the route on HiiKER is a sensible way to stay on the intended line when multiple trods and tracks branch across the hillside. The route around Castlelaw and Fala Knowe is also noted by local Pentland sources as an alternative to the often boggy Kirkburn-side path. (pentlandfriends.org.uk)

Landmarks, scenery, and wildlife

Allermuir Hill is the visual highlight for many walkers, but the surrounding features give the loop its character. Fala Knowe sits on the hill flank below the higher tops, and Castle Knowe/Castlelaw adds a strong historical dimension to the walk. The nearby Castlelaw Hill Fort is an Iron Age stronghold occupied for several centuries, with three concentric rings of ramparts and ditches. That means this is not just a scenic hill circuit; it also passes through a landscape shaped by very early settlement and defense, with commanding views that clearly explain why people chose these heights long before modern recreation. (historicenvironment.scot)

The Pentlands are a mosaic of heather moor, rough grassland, reservoirs, and grazed hill pasture. Depending on season and exact line, hikers may see grouse moor habitat, upland grasses, patches of bracken, and in late summer some good heather color. Birdlife can