Obon (お盆) is one of Japan’s biggest holiday seasons — a multi-day period in mid-August when families across the country travel to their hometowns to honor ancestors. For Aso, it means one of the busiest stretches of the year, with roads around popular sightseeing spots becoming heavily congested.
Aso City Tourism has issued a notice specifically flagging the area around Kusasenri (草千里) — the sweeping volcanic meadow with its iconic pond, located on the slopes of Mt. Aso — as a congestion hotspot during the 2026 Obon period. Visitors heading to Kusasenri should expect significant delays and are encouraged to check the latest traffic advisories before setting out.
While specific alternate routes and parking details had not been published at the time of writing, Aso City Tourism has indicated that crowd-reduction measures are being planned. We recommend checking the Aso City Tourism Association website closer to the date for full details, including any suggested off-peak visit times or recommended approach roads.
It’s also worth noting that access to parts of Mt. Aso may be subject to volcanic alert restrictions during this period — check the latest Mt. Aso alert status before you go, and review any crater area closures that may still be in effect through the end of July 2026.
As a general rule for visiting Aso during Obon: consider arriving early in the morning before 9 a.m., or in the late afternoon, to avoid peak congestion windows. Midweek days tend to be quieter than weekends. If you’re relying on public transit, the Minamiaso Railway's Sunny-Go train is a scenic and traffic-free alternative for part of the journey.
Source: Aso City Tourism
