Los Alamos Halloweekend & Trick-or-Treat on MainStreet

Los Alamos Halloweekend, Friday, Oct. 30 - Sunday, Nov. 1, 2026, features a variety of festive and spooky holiday events for the entire family. The primary event during the weekend is Trick–or–Treat on MainStreet, which will haunt downtown Los Alamos again on Friday, Oct. 30, 2026, from 4-6 p.m. Part of Central Avenue closes to auto traffic and becomes a safe pedestrian area where local businesses and organizations distribute candy to costumed families. The weekend’s festivities attract an average of 7,000 people. More information about all Halloweekend events can be found at http://losalamosmainstreet.com/events/halloweekend/.