100 Mile Grand Slam

Worthing, United Kingdom • 1-17 May-Oct 2027

The 100 Mile Grand Slam will take place in Worthing from Saturday 1 May 2027 to Sunday 17 October 2027. You can run 100 miles. Visit the organization's website for the most recent information.

Race information

100 mi
Thames Path 100
100 mi
Autumn 100
100 mi
North Downs Way 100
100 mi
South Downs Way 100
Visit the organization's website for the most recent information.
Trail runs nearby

Off-road multi lap run at Nutbourne Vineyards with views to the South Downs. Choose distances from 5 km up to a half marathon on the day; entry is £29, places are limited to 100, and finishers receive a medal, drink and cake.

Mud Monsters Run on 17 May 2026 in East Grinstead is a muddy obstacle event with 3 km, 5 km and 10 km routes through fields, woods and river crossings. Finishers get a medal and free photos; onsite parking costs £5.

Three Beaks Trail Running Day offers three self supported trail routes from Beak Brewery in Lewes on 17 May 2026. Routes are unmarked but run leaders guide groups and each finish includes a complimentary drink.

Dragon's Eye Race 1 2026 at Hurtwood Park Estate offers looped off road laps over mostly flat trails with a seven hour time limit. Participants can run from 5 km up to ultra distance and receive a bespoke finishers' medal.

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