Police say Turcotte and another man were hurt Monday when the van Turcotte was driving left the Trans-Canada Highway, hit a snowbank and flipped onto its side on the pavement.
RCMP Const. Yannick Pelletier says the accident happened around 9:45 a.m. near Four Falls.
He says the accident is under investigation but roads were covered in snow and slippery at the time.
Both men were taken to hospital in Perth-Andover, but Pelletier could not comment on their conditions.
The 73-year-old Turcotte is best known as the rider of Secretariat, winner of the U.S. Triple Crown in 1973.
He was paralyzed from the waist down when he fell from a horse during a race at Belmont Park in 1978.