There are 3 upcoming marathon races in Berkshire listed. Next up: Windsor Dorney Lakeside Marathon (Sunday, 18 October 2026), Original Marathon X (Saturday, 13 March 2027), Goring Gap Trails Festival (Saturday, 22 May 2027).
Upcoming races only, soonest first. Confirm dates and entry details with the organiser.
Windsor · Dorney Lake, Off Court Lane, Windsor, Berks, SL4 6QP
Windsor Dorney Lakeside Marathon is organised by Run UK in Windsor. Entry options: Windsor Dorney Lakeside Marathon. The course surface has not been confirmed.
£41.51
See entry options & fees
Windsor · Church Street
Original Marathon X takes place in Windsor on 13 March 2027. Check the organiser’s page for the route, start arrangements and eligibility.
£79.50–£108
See entry options & fees
Reading · Reading RG4 7TR, UK
Goring Gap Trails Festival is organised by Good Running Events in Reading. The published event dates run from 2027-05-22 to 2027-05-23. Entry options: Goring Gap Half Marathon; Goring Gap 52K Ultra Run; Goring Gap 50 Mile Ultra Run; Goring Gap Trail Walks - Half Marathon; Goring Gap Trail Walks - Marathon.
£38–£82
See entry options & fees
Work out your target marathon time and pace.