Confront the untamed power of the Dorset coast at BigSea, the second event in the inspiring Classic Element Trail Series, on Sunday, June 7, 2026. This dramatic trail run is inspired by the element of Water, starting and finishing on the golden sands of Knoll Beach and challenging you to battle over an ancient, rugged Jurassic coastline. Choose your epic distance—from a Half Marathon to a formidable 54km ultramarathon—and embark on a single lap route that showcases iconic landmarks like Old Harry Rocks, Corfe Castle, and the dramatic cliffs of Kimmeridge Bay.
You'll experience a truly wild and scenic adventure, with courses that traverse the Purbeck Hills and reward every step with breathtaking sea views. The event is designed for the modern trail runner, featuring well-stocked aid stations supplied by Precision Fuel & Hydration, cupless environmental policies, and an option to plant a tree instead of receiving a medal. With a friendly, energetic atmosphere, fully marked routes, and a strict nine-hour cut-off for the longest distances, BigSea offers the perfect balance of coastal challenge and reliable organisation. Lace up your shoes and test your spirit against one of England's most spectacular and elemental trail running experiences.
Races Offered
18 miles
Jun 07, 2026
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Distance —
29K
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Type ——
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09:00
54 km
Jun 07, 2026
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Distance —
54K
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09:00
Half Marathon
Jun 07, 2026
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Distance —
21.1K
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09:00
Marathon
Jun 07, 2026
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Distance —
42.2K
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Type ——
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09:00
Weather History
These values represent the 3-year monthly averages for June in Isle of Purbeck.
thermostatTemperature
12.6° / 19.4°
wb_sunnyFeels like
10.1° / 17.1°
light_mode
Avg sunshine hours
13h 19m
water_drop
Avg rainfall
1.1 mm
ac_unit
Avg snowfall
—
air
Avg wind speed
16.2 km/h (Gentle breeze)
opacity
Sweat loss rate
Moderate
terrain
Course conditions
Firm and slightly soft
sunny
Max UV Index
Moderate (5.6)
humidity_mid
Humidity
75.8%
wb_twilight
Sunrise
04:56
nightlight
Sunset
21:20
About Isle of Purbeck
Learn more about the host city, Isle of Purbeck.
The Isle of Purbeck is a peninsula in Dorset, England. It is bordered by water on three sides: the English Channel to the south and east, where steep cliffs fall to the sea; and by the marshy lands of the River Frome and Poole Harbour to the north. Its western boundary is less well defined, with some medieval sources placing it at Flower's Barrow above Worbarrow Bay. John Hutchins, author of The History and Antiquities of the County of Dorset, defined Purbeck's western boundary as the Luckford Lake stream, which runs south from the Frome. According to writer and broadcaster Ralph Wightman, Purbeck "is only an island if you accept the barren heaths between Arish Mell and Wareham as cutting off this corner of Dorset as effectively as the sea." The most southerly point is St Alban's Head.
