The Natural Calendar: October and November

Monarch butterflies (central Mexico): the Monarch Butterfly Biosphere Reserve in Michoacán and the State of Mexico is a World Heritage site, inscribed in 2008. Visitors generally go between about November and March; one detailed report said the 2024–25 season opened on 15 November, and which sanctuaries open changes by year. Predictable season, exact opening dates set each year.

Autumn colour (Kyoto and Japan): Japan Meteorological Corporation's first 2026 forecast put Kyoto's yellow leaves around 27 November and red around 11 December. A forecast, not a promise.

Olive ridley turtles (Odisha): Odisha's annual fishing ban to protect turtles runs from 1 November to 31 May. Mass nesting at Gahirmatha and Rushikulya usually happens in February or March but varies from year to year, and in some years Gahirmatha has had none. Uncertain: do not plan a trip around an arribada.