Helvellyn Double
It takes two of the Lake District's best-known summits and links them properly, so instead of picking Fairfield or Helvellyn for the day, you get both, with the climbing to prove it.
Effort: Ultra distance and major ascent
Underfoot: Technical, navigation required
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A 36.7km, 2,856m ultra from Ambleside that runs the Fairfield ridge to Nab Scar, Heron Pike, Great Rigg and Fairfield, then crosses Grisedale Hause to Helvellyn's summit and back for a second pass near the top before returning.
It takes two of the Lake District's best-known summits and links them properly, so instead of picking Fairfield or Helvellyn for the day, you get both, with the climbing to prove it.
The route
This starts the same way as the classic Fairfield Horseshoe, climbing out of Ambleside past Rydal onto Nab Scar, then following the ridge over Heron Pike and Great Rigg to Fairfield's summit at 873m. From there the route drops off the western side of the plateau, loses height down Grisedale Hause, and climbs again onto Helvellyn, England's third-highest peak at 950m. The track shows two separate close passes near Helvellyn's top rather than one clean tag and turnaround, which is where the double in the name comes from - you spend real time on the high ground up there before committing to the return.
Why the numbers are what they are
2,856m of ascent over 36.7km is a big day by any measure, more climbing than the extended version of the horseshoe despite covering less ground. That's the cost of the Grisedale Hause link: steep, loose, and unforgiving in both directions, with no flat recovery section to bank time on. Treat this as a mountain ultra rather than a long trail run - fuel and pace it that way.
Getting back
The return follows the same line back over Grisedale Hause and Fairfield before dropping south down the horseshoe's western arm past Great Rigg, Heron Pike and Nab Scar into Rydal and back to Ambleside. By the time you're back on the Fairfield plateau for the second time, cloud or fading light can make the flat summit genuinely difficult to read, so this isn't one to start late in the day or without a backup plan if the weather turns.
When to go
Spring through autumn gives you the best chance of a clear ridge and a runnable Grisedale Hause. In winter this becomes a proper mountaineering objective - the col holds snow and ice long after the valleys have cleared, and the exposed high ground between Fairfield and Helvellyn is no place to be caught out without the right kit.
Grisedale Hause is loose scree in both directions and sits a long way from any easy escape route. Fairfield's flat summit plateau is disorientating in cloud, and this route crosses it twice - once on tired legs on the way back.
Summits on this route
Safety on this route
- No signal? Text 999 — pre-register first: text register to 999
- Tell someone your route and expected return time before you head out
Leave No Trace
- Leave nothing but footprints, take nothing but memories.
- Please respect the countryside and all its inhabitants.
- Dogs on leads near livestock, and around ground-nesting birds from March to July.
- Gates as you find them — open or closed, leave it that way for the farmer and the next runner.
- Take it all home — wrappers, peel, tissue, the lot. It doesn't count as biodegradable if you can still see it.
- Stick to the path where the ground either side is wet, planted, or nesting habitat.
Common questions
Run by us· last checked July 2026
Jason Millward has run this route and written it up from the ground. How we check routes
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