Overview
- State electoral bodies published and approved the local calendars in early October 2026, formally opening the 2026–2027 electoral processes in Colima and Sonora.
- Colima's official calendar starts in October 2026, sets gubernatura precampaigns for December 2026–January 2027, schedules campaigns through March until the June 2, 2027 election, and staggers installations from October to November 2027.
- The IEE Sonora calendar fixes gubernatura precampaigns from December 2, 2026 to January 10, 2027 and places the state vote on June 6, 2027, with campaigns for governor running March 5–June 2 and other contests from April 24–June 2.
- Sonora's schedule grants independent hopefuls the same precampaign windows but requires them to collect signatures equal to at least 3% of the relevant voter roll, and the Jan. 10 precampaign close aligns with INE dates published in the Diario Oficial de la Federación.
- Both states build in post‑vote oversight: fiscal audits of party spending are planned for June–July 2027 and Colima's electoral tribunal must rule on admitted appeals within 10 days, while Sonora's calendar could be delayed if the state congress does not approve the 2027 budget.