Hazard: Moderate
A high Far Eastern fell crowned by the landmark Thornthwaite Beacon, a tall stone column that is a useful navigation aid up here. The walking on top is easy, but the steep, rough, loose descent to Threshthwaite Mouth is the catch — meandering over crags and damp ledges with two awkward rocky steps — and the fell takes its name from the crags on its western flank. Patterdale Mountain Rescue Team covers this ground.
- The descent to Threshthwaite Mouth: The path down to the saddle drops steeply over rough crags and damp ledges, with two rocky steps — the second, just above the saddle, is slightly tricky and may need facing in to the rock to down-climb. Loose in places; pick the correct line from the beacon (a grassy route avoids the worst of the scree). Take it slowly, especially when wet.
- The western crags: The fell is named for the crags on its western side. Keep back from the edge near the summit, particularly in cloud or wind where the broad top gives little warning.
- Exposure on the high open ground: This is high, exposed ground with little shelter; the beacon aids navigation but in cloud you still need a bearing to choose the right path off. Plan for wind and changeable conditions.
Who should attempt this fell: Thornthwaite Crag is easy on top, but respect the descent to Threshthwaite Mouth: it's steep, loose and crag-strewn with an awkward down-climb near the saddle, so take the better-graded line from the beacon and move carefully, especially in the wet. Keep back from the western crags, navigate by compass in cloud despite the helpful beacon, and treat the steep ground as full winter terrain when iced.
Most common causes: Slips and difficulty on the steep, loose Threshthwaite Mouth descent and its rocky steps · Taking the wrong (looser) line down from the beacon · Walkers straying toward the western crags in poor visibility · Exposure on the high open ground in wind or winter
Local Mountain Rescue: Patterdale Mountain Rescue Team (opens in new tab) · Reviewed 14 Jun 2026
Safety: Hazard guidance compiled from published Mountain Rescue reports and well-documented accident history - editorial background, not a live feed of callouts. Always check current conditions, carry proper navigation equipment, and seek qualified instruction before heading onto the fells. In an emergency, call 999, ask for Police, then Mountain Rescue.
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