Pennsylvania’s two-term elected state Treasurer Stacy Garrity will seek the Republican nomination to challenge Democratic Gov. Josh Shapiro’s reelection bid in 2026.

The Pennsylvania Republican Party plans to endorse a candidate for governor in September — nearly half a year earlier than in the past — in an attempt to learn from its 2022 losses and capitalize on its 2024 successes.

Republicans hope Ms. Garrity, the state treasurer, will give them a shot against Gov. Josh Shapiro. But he will be tough to beat, and the Republican field could still be complicated by Doug Mastriano.