# 1958 Idaho gubernatorial election

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vte :
The 1958 Idaho gubernatorial election was held on November 4. Incumbent Republican Robert E. Smylie defeated Democratic nominee Alfred M. Derr with 50.96% of the vote.
Since changing to four-year term for governor beginning with the 1946 election, this was the first time the incumbent was permitted to run for re-election, due to a change in the state's constitution, approved by voters in November 1956. The last incumbent to be re-elected was C. Ben Ross, who won a third two-year term in 1934.

## Primary elections

Primary elections were held on August 12, 1958.

### Democratic primary
#### Candidates

* Alfred M. Derr, Clark Fork state senator
* H. Max Hanson, Fairfield state senator
* John Glasby, Mountain Home, former state party chairman
* Omar Maine, Parma farmer

#### Results

Democratic primary results :
| Party | Party | Candidate | Votes | % |
| | Democratic | Alfred M. Derr | 25,599 | |
| | Democratic | H. Max Hanson | 25,477 | |
| | Democratic | John Glasby | 21,207 | |
| | Democratic | Omar Maine | 1,929 | |
| Total votes | Total votes | Total votes | 48,613 | 100.00 |

### Republican primary
#### Candidate

* Robert E. Smylie, incumbent governor (unopposed)

#### Results

Republican primary results :
| Party | Party | Candidate | Votes | % |
| | Republican | Robert E. Smylie (incumbent) | 41,568 | 100.00 |
| Total votes | Total votes | Total votes | 41,568 | 100.00 |

## General election
### Candidates

* Robert E. Smylie, Republican
* Alfred M. Derr, Democratic

### Results

1958 Idaho gubernatorial election :
| Party | Party | Candidate | Votes | % |
| | Republican | Robert E. Smylie (incumbent) | 121,810 | 50.96% |
| | Democratic | Alfred M. Derr | 117,236 | 49.04% |
| Majority | Majority | Majority | 4,574 | |
| Turnout | Turnout | Turnout | 239,046 | |
| | Republican hold | Republican hold | Swing | |