The Carter Center announced his return to the Lyle Street Habitat build on Twitter.
Carter, 92, became unsteady while working on Thursday on the steps of a home at a building project for Habitat for Humanity, a charitable organization that promotes affordable home ownership, eyewitnesses said.
Carter has always been involved with Habitat for Humanity's work and, along with his wife Rosalynn Carter, sponsors the annual Carter Work Project.
The statement also said Carter and his wife, Rosalynn, appreciate the many well-wishes they received worldwide. He spent the night at St. Boniface Hospital, where he was treated for dehydration.
Carter's visit to the hospital generated an outpouring of support for the former president, who has lived longer after his term in office than any other president in USA history.
Carter told local news station 630 CHED, "When we get through with this build here, we'll look back and say 'this was one of the best we ever had'".
Before leaving the build site in an escorted ambulance Thursday, Carter passed on a message to the other workers and volunteers, telling them to "stay hydrated and to keep building".
Carter and the former first lady are in Winnipeg, working on their 34th annual Habitat for Humanity "Carter Work Project".
Carter had joined Habitat as the organization builds 150 homes for people in need in Canada to celebrate the country's 150th anniversary.