2018Final results
2018 election for Colorado Senate District 1
Colorado State Senate · Colorado
Jerry Sonnenberg (R) won with 79.0% of the vote, defeating Debra Gustafson (D) by 58.0 points.
Jerry SonnenbergRepublican · winner · incumbent
79.0%52,311
Debra GustafsonDemocrat
21.0%13,894
66,205 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET