The Loros Twilight Walk has been postponed because of bad weather.
One of the charity's biggest annual fund-raisers, it was due to start from the King Power Stadium tomorrow and involve a 10km walk through the city centre.
It has been rescheduled for Saturday, April 13.
Spokeswoman for Loros Diane Morris said: "It has been rescheduled because of the weather. It is just too dangerous, and I think the snow will make it just too slippy and too cold.
"The arrangements will stay the same for the rescheduled walk."
Last year the walk generated more than £50,000 for Loros, which is based in Groby Road, supports about 2,500 patients and their families each year.
