Iowa's 3rd Congressional District remains one of the most competitive House races heading into the November 3, 2026, general election, with incumbent Republican Zach Nunn facing Democrat Sarah Trone Garriott in a seat that delivered narrow Republican wins in 2022 and 2024. Forecasters rate the contest a toss-up, reflecting its R+2 partisan voting index and history of close margins. Trone Garriott's slight fundraising advantage, record of flipping competitive state legislative seats, and focus on tariff impacts on Iowa farms, healthcare access, and reproductive rights have positioned her as the market favorite. Recent campaign activity includes her September 22 criticism of Nunn over Epstein files transparency efforts. National midterm dynamics and voter turnout in the Des Moines suburbs and rural southwest areas will shape the final outcome.