Grimwith Blast

Grimwith Blast

It links a big day in Wharfedale with the wide-open water and skies around Grimwith, so you get valley running, moorland crossings and a proper reservoir circuit all in one loop without needing a second car.

EXPERT

Effort: Ultra distance and major ascent

Underfoot: Open fell or rough terrain

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Distance
56.2km
Ascent
1,503m
Descent
1,504m
High point
501m
Est. time
7h 20m – 9h 55m
Route type
Loop
In short

A 56.2km ultra loop from Skipton up through Wharfedale to Grimwith Reservoir and back, with 1503m of climbing spread across dale paths, moorland tracks and one of the Dales' largest reservoirs.

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It links a big day in Wharfedale with the wide-open water and skies around Grimwith, so you get valley running, moorland crossings and a proper reservoir circuit all in one loop without needing a second car.

The route

Starting and finishing in Skipton, this route heads north into Wharfedale, climbing steadily through the farmland and drystone-walled fields that give the Dales their character before reaching Grimwith Reservoir, tucked between Grassington and Pateley Bridge. A well-surfaced path circles the reservoir itself, a rare stretch of properly flat, fast running in the middle of a long day, before the route turns back south to retrace its way to Skipton.

Grimwith itself

Grimwith is the largest reservoir Yorkshire Water owns by storage, and the loop around it is popular with walkers and the local sailing club rather than runners, so expect a change of pace and company partway through this route. It's a good psychological marker too - reaching the reservoir means you're roughly at the turnaround point of a genuinely long day out.

The ground between

The connecting sections between Skipton and Grimwith mix quiet lanes, farm tracks and open moorland edges, with a few boggy stretches where the path crosses rough pasture. None of it is technical, but 56km with 1503m of climbing spread thinly across that distance is a different kind of demanding to a shorter route with a single big hill - it's about sustained effort and fuelling rather than one hard climb.

Why runners come back to it

Grimwith Blast rewards anyone training for a bigger event later in the year - a hilly ultra or a multi-day stage race - because it forces you to manage pace and fuelling over real distance without the added complication of technical ground. It's a route to learn about your own limits on rather than one to chase a fast time on.

Getting it right

This is long enough that weather, light and navigation all matter more than they would on a shorter loop. Carry more kit than the modest climbing figure might suggest, and treat the reservoir path as a good place to check your pace and refuel before the return leg back into Wharfedale and down to Skipton.

Watch out for

The sheer distance is the main hazard here - 56km with modest but constant climbing wears differently to a shorter, steeper route. Some moorland sections are shot over for grouse between August and December, so expect diversions or restricted access on those dates.

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.

Full Countryside Code & Leave No Trace guide →

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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Jason Millward

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Kit for this route

INOV8 Men's MUDTALON Speed V2 Running Shoe

INOV8 Men's MUDTALON Speed V2 Running Shoe

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Salomon Supercross 4 Trail Running Shoes

Salomon Supercross 4 Trail Running Shoes

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Hoka Speedgoat 7

Hoka Speedgoat 7

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