 | |||||||||||||||||
| |||||||||||||||||
| |||||||||||||||||
 County results Tester: 40–50% 50–60% 60–70% 70–80% Burns: 40–50% 50–60% 60–70% 70–80% 80–90% | |||||||||||||||||
| |||||||||||||||||
| Elections in Montana |
|---|
 |
The 2006 United States Senate election in Montana was held November 7, 2006. The filing deadline was March 23; the primary was held June 6. Incumbent Republican Senator Conrad Burns ran for re-election to a fourth term, but lost to Democrat Jon Tester by a margin of 0.87%, or 3,562 votes out of 406,505 cast. This made the election the second-closest race of the 2006 Senate election cycle, behind only the election in Virginia. This was the last time an incumbent Senator lost reelection in Montana until 2024, where Tester lost to Tim Sheehy.