Iowa Governor 2026 Rep Primary

The Iowa Governor rep primary is scheduled for June 2, 2026. The model sees a close race: Adam Steen edges Zach Lahn, 45% to 42% in a 5-candidate field. Zach Lahn leads the field in reported fundraising and Randy Feenstra has the most tracked endorsements. Public polling is available for this race and feeds the forecast alongside fundraising, endorsements, and historical results.

Current win probabilities

1. Adam Steen — 45%
2. Zach Lahn — 42%
3. Brad Sherman — 7%
4. Randy Feenstra — 4%
5. Eddie Andrews — 1%

Probabilities update daily from polls, fundraising, endorsements, and historical results. Last updated July 23, 2026.

All 2026 race forecasts · About the model