Climbing sharply from the Somerset coast up onto the Exmoor plateau, Porlock Hill is reputed to be one of England’s steepest A-roads, with sections close to 25% within the first few hundred metres.
A short, brutal ascent
From Porlock, it’s just 3.9 km for 366 m of elevation gain, averaging 9.3%, with a punishing opening section reaching 23 to 25% on some of the hairpins. The top sits around 350-400 m, at the edge of the Exmoor plateau.
A reputation that reaches beyond cycling
Reputed to be England’s steepest A-road, Porlock Hill has hosted its own annual hill-climb time trial since 2013. The road is flagged as unsuitable for caravans and heavy vehicles given its gradient, a reputation that long predates its use by cyclists.
Getting the ride right
Compact or triple gearing is essential to avoid stalling on the 25% ramps, while brake pads in good condition offer reassurance on the descent, just as steep in the other direction.
When to go
April to October — take care in winter, when frost or rain can make the steepest sections slippery.
Good to know
A gentler alternative sits right alongside it: the historic Porlock Toll Road, built in the 1840s, climbs far more gradually with a maximum gradient of around 7%, for the price of a toll.
