Democrats hold an implied 68.5% probability of winning Arizona State Senate control in the November 3 general election, compared with 16.5% for Republicans, reflecting trader consensus on a competitive but Democratic-leaning contest. All 30 seats are on the ballot following the July primaries. Republicans currently hold a 17-13 majority after 2024 gains, but the chamber is rated a toss-up or lean Democratic by multiple forecasters amid a broader national environment favoring Democratic performance in state legislative races. Key influences include multiple Republican retirements, including the Senate president, Democratic gains in recent cycles, and targeted competition in swing districts. A Democratic flip would contribute to a potential state trifecta with the Democratic governor, though narrow margins leave room for shifts before election day.