# Monarch butterfly annual migration > Live situation record from CLSTR: https://clstr.news/situations/monarch-butterfly-annual-migration > Updated: 2026-10-17T19:20:26.000Z. Sources: 17. Developments: 7. Monarch butterflies are undergoing their annual migration from southern Canada and the northern United States toward central Mexico, a journey exceeding 2,000 miles toward mountain forests for the winter. The migration typically sees its largest wave through September and October. In Texas, the migration has reached areas such as San Angelo. San Angelo State Park hosted a free monarch migration event on October 10, which included a presentation and a guided hike to a monarch waystation at the Bell’s Trailhead to observe the seasonal movement. As the migration progresses into October and November, butterflies arrive in Mexico, coinciding with Day of the Dead celebrations. In Mexican indigenous cultures, such as the Purépecha, Mexica, and Zapotec, the butterflies hold sacred significance and are often viewed as “the souls of the deceased or messengers of the gods,” arriving to visit the living in early November. Some communities continue to honor them with offerings of flowers and copal. Recent sightings indicate thousands of butterflies have begun arriving in northern Mexico. In the state of Coahuila, significant numbers have been reported in municipalities including Sabinas, Ciudad Acuña, Piedras Negras, and Nava, with similar sightings noted in Nuevo León. Cold front number two and northern winds have reportedly acted as environmental catalysts, providing aerodynamic assistance to accelerate the southward journey. Monitoring efforts by the Profauna Association’s ‘Correo Real’ program and the ‘Project Monarch’ mobile application are documenting specimens. Researchers continue to utilize BlūMorpho ultra-lightweight solar transmitters weighing approximately 60 milligrams to track migration routes. Travelers heading to the oyamel forests of the Monarch Butterfly Biosphere Reserve in Michoacán and Estado de México are advised to confirm specific opening dates and schedules for sanctuaries like El Rosario, Sierra Chincua, El Capulín, or Macheros. ## Timeline ### 2026-10-17: Monarch butterflies begin migration into Mexico Thousands of monarch butterflies are migrating from the US to Mexico, aided by cold fronts and northern winds, as they head toward hibernation sanctuaries in Michoacán and the State of Mexico. 3 sources. https://clstr.news/cluster/monarch-butterfly-migration-arrives-in-mexico ### 2026-10-15: Monarch butterfly migration begins in Mexico Monarch butterflies are beginning their 4,000-km migration to Mexico's biosphere reserves, a journey deeply tied to indigenous traditions and the Day of the Dead celebrations. 5 sources. https://clstr.news/cluster/monarch-butterfly-migration-begins-in-mexico ### 2026-10-09: Monarch butterflies arrive in Mexico for annual migration Monarch butterflies have arrived in Mexico for their annual migration and the Day of the Dead. Researchers are using new ultra-lightweight solar transmitters to track their routes through the sanctuaries. 2 sources. https://clstr.news/cluster/monarch-butterflies-arrive-in-mexico-for-annual-migration ### 2026-10-09: Monarch butterfly migration reaches Texas as species heads to Mexico Monarch butterflies are migrating from North America to Mexico, with San Angelo State Park hosting a public observation event on Oct. 10. 3 sources. https://clstr.news/cluster/monarch-butterfly-migration-reaches-texas-as-species-heads-to-mexico ### 2026-10-06: Monarch butterflies arrive in Coahuila for annual migration Monarch butterflies have arrived in Coahuila, Mexico, marking the start of their annual migration. Citizens can track tagged specimens using the Project Monarch app to assist scientific research. 2 sources. https://clstr.news/cluster/monarch-butterflies-arrive-in-coahuila-for-annual-migration ### 2026-09-27: Monarch butterflies begin annual migration across North America Monarch butterflies are migrating across North America toward central Mexico, with peak sightings occurring throughout September and October across the United States and Canada. 3 sources. https://clstr.news/cluster/monarch-butterflies-begin-annual-migration-across-north-america ### 2026-09-20: Monarch butterflies begin annual migration to Mexico Monarch butterflies are migrating toward Mexico, with Louisiana's Grand Isle State Park serving as a key coastal stop for the species during their autumn journey. 2 sources. https://clstr.news/cluster/monarch-butterflies-begin-annual-migration-to-mexico --- Cite as: Monarch butterfly annual migration. CLSTR, https://clstr.news/situations/monarch-butterfly-annual-migration