Chillswim Ullswater 7.5 Miles End to End

In 1962, the final shift workers abandoned the Greenside Mine above Glenridding, marking the end of an industrial era that once extracted 156,000 tons of lead and 45 tonnes of silver from the earth. Before the site fell silent, researchers from the Atomic Weapons Research Establishment used the deep, abandoned tunnels to monitor seismic signals from underground nuclear tests, a strange footnote in the history of this valley. Today, the landscape is defined by the glacial depth of Ullswater, where the scars of mining have given way to the calm, seven-mile expanse of water that serves as the course for the Chillswim End to End. As you begin your swim in the shadow of the mountains, you are tracing a route that the young William Wordsworth once explored, famously recounting his own childhood mischief of fishing from a stolen boat on these very waters.

Navigating the glacial basin

The swim covers 12,070 metres, moving from the southern tip at Glenridding toward the finish at Parkfoot Holiday Park. With a maximum depth of 63 metres, the lake maintains a distinct character, requiring swimmers to navigate the length of the valley while staying within 50 metres of the shore after the first mile. You will likely pass the slopes of Glencoyne Wood, a protected SSSI area where the elusive red squirrel is still recorded, and catch glimpses of the steep scree slopes of Birk Fell on the eastern bank. The event provides six feed stations along the route, each positioned near the shore to offer support as you progress through the lake's glacial length.

Race day logistics

This annual event, now in its 7th edition, is designed for those who appreciate a sustained challenge, with a maximum pace requirement of 65 minutes per mile. The race is wetsuit-optional, with separate categories for those choosing to swim without one. Whether you are a regular in these waters or planning your first long-distance crossing, you might find the shorter, more focused nature of other local events a useful addition to your calendar; those seeking a different pacing for their season can look into the BLDSA Ullswater event held in August. The logistics are managed via shuttle buses from the race headquarters, and participants are required to use a tow-float, a standard safety measure for navigating the open waters of the Lake District.