Clo Cow Half Marathon

The Clo Cow Half Marathon, 10K & 5K is an annual running event held in Historic Downtown Petaluma, California. The 13th edition, scheduled for October 12, 2025, features three race distances: a half marathon, 10K, and 5K. The scenic half marathon course winds through rural Sonoma County farm country, offering runners rolling hills and views of local farm animals like sheep, horses, and cows.

The challenging inclines reward participants with beautiful countryside vistas. All race entries include a T-shirt, cowbell medal, and post-race food. The event supports the Petaluma Educational Foundation, combining fitness with community fundraising. Visit the organization's website for the most recent information.