Karbach Brewing Monster Mash Run 2026

The Karbach Brewing Monster Mash Run is a Halloween race in Houston, part of the Houston Holiday Series. Participants are known as Monster Mashers, and the event welcomes runners of all abilities, not just competitive racers. The race takes costumed participants through Houston, where creative outfits are as significant as the running itself. This is the seventh annual event in the series, concluding with an after-party that organizers claim is the premier Halloween run party in the city.