Which courts have heard or will hear challenges to Oregon's 2025 gun legislation and on what dates?

1. Harney County Circuit Court — the local trial forum where the state case began

The state-level challenge that produced the current appellate trail began in Harney County Circuit Court, where trial proceedings and hearings took place (including a noted hearing in Burns on Dec. 13, 2022) as challengers originally sued over Measure 114’s permit and magazine provisions ^{[1] [2]}; that local proceeding was the factual and legal record that later fed the appeals process and is explicitly cited in contemporaneous coverage ^[1].

2. Oregon Court of Appeals — affirming constitutionality on March 12, 2025

The Oregon Court of Appeals ruled that Measure 114 is constitutional on March 12, 2025, a pivotal decision that the plaintiffs appealed and that prompted the next stage of review at the state supreme-court level ^{[1] [2]}; news outlets reported that plaintiffs had roughly a month to seek further review after the March 12, 2025 opinion ^[2].

3. Oregon Supreme Court — arguments heard in early November 2025

The Oregon Supreme Court took up the appeal from the Court of Appeals, with reporting showing the high court heard oral arguments in early November 2025 (coverage places arguments and questioning in the first week of November, with specific articles dated Nov. 6–8, 2025 describing the hearing) ^{[4] [3] [6]}. State coverage characterizes those early-November proceedings as the culmination of the state-court challenge and notes justices’ questioning about historical gun presence versus contemporary public-safety rationales ^{[3] [4]}.

4. Federal challenges — filed, active, but hearing dates not specified in the provided reporting

Separate federal litigation over Measure 114’s high-capacity magazine restrictions has been filed — for example, a federal challenge by the Canby-based Oregon Firearms Federation is noted in reporting — but the provided sources do not give specific federal-court hearing dates or a scheduled timetable for those federal cases ^[5]. Reporting makes clear Measure 114 has been litigated “in both state and federal courts,” but the exact federal hearing dates are not contained in the supplied pieces ^{[3] [4]}.

5. Legislative and venue actions that could affect future filings and where disputes are heard

During the 2025 legislative session lawmakers debated bills that would alter Measure 114’s terms or the venue for future challenges — House Bill 3075, for example, would require any new challenges of Measure 114 to be filed in Marion County Circuit Court — a development explicitly reported in spring 2025 that could shift where future state challenges are lodged even as existing appeals proceed through Harney County, the Court of Appeals and the Oregon Supreme Court ^{[7] [8] [9]}.

6. What the record shows and what remains unknown in available reporting

The public record in these pieces establishes the Harney County Circuit Court as the original trial forum, the Oregon Court of Appeals’ March 12, 2025 decision upholding Measure 114, and the Oregon Supreme Court hearings in early November 2025 ^{[1] [2] [3] [4]}; however, the reporting notes separate federal challenges exist without providing scheduled federal hearing dates, and it does not provide a final Oregon Supreme Court ruling date in the sources supplied ^{[5] [3]}.