He was easily re-elected in the cold winter election, defeating by a landslide the future Member of Parliament Frederick William Gershaw a candidate from the Liberals.

The 1925 Canadian federal election saw the ridings in Alberta redistributed, Gardiner changed to the brand new Acadia district.

He easily won his district again in the 1926 Canadian federal election this time under the banner of the United Farmers of Alberta.

Gardiner would be acclaimed to his 5th term in the 1930 Canadian federal election and also served as president of the UFA.

Upon running for his 6th term in office, this time under the Co-operative Commonwealth Federation banner, he would be defeated by Victor Quelch from the Social Credit Party of Canada in the 1935 Canadian federal election.