The 80th Annual Los Alamos Old Days celebration in California is traditionally held on the last full weekend of September, featuring a 5k run, car show, artisan mart, and a parade.

While specific 2026 dates are pending, based on historical schedules, the event is likely to take place around September 25-27, 2025, featuring a weekend of festivities organized by the Los Alamos Valley Men's Club

Anticipated Highlights (Based on Annual Event):

• Friday Night: Kick-off with a Chili Cook-off, dinner, and auction (6pm) .

• Saturday: Classic Car Show on Bell Street and an Artisan Fair (9am-3pm).

• Sunday: The "Greatest Little Small Town Parade," (11am); preceded by a 5K Run/Walk (9:30am).

• Activities: Live music, dancing, food trucks, and a beer garden. 

For the most up-to-date schedule as 2026 approaches, you can check the Los Alamos Valley Men's Club website or the Santa Maria Valley tourism