Tomorrow's Cotswold Marathon has been abandoned amid fears around the weather.
The night-time hike, organised by Scouts and Girl Guides, would have seen 250 walkers from across the country take on the muddy challenge, starting out from Tuffley at 5pm and trekking a 36-mile circular route.
A statement from the organisers said: "Following discussions with our District Commissioner it has been agreed that the 41st Cotswold Marathon should be abandoned for this year.
"The decision has been taken on safety grounds due to the forecast weather for tomorrow evening.
"The weather forecast is for heavy rain showers from 11am through until midnight with the possibility of hail and thunder. There are 50mph winds forecast possibly gusting to 70mph which will give a wind chill of well below 0C.
"Taking account of the forecast and that the ground is already saturated it is possible that trees will be unstable in the strong winds, also the combination of wind and rain is not good particularly when we have young people out on the route. There is also the difficulty in keeping tents up in gale force winds.
"The decision has not been taken lightly and it is obviously a disappointment for the organising team but the team have made the decision as the safety of the walkers and staff is paramount.
"The organisers hope to see everybody next year February 7/8 2015."