Filthy Fifty Mountain Bike Race 2026
October 31
The 12th Annual Filthy 50+ is a mountain bike ride scheduled for Saturday, October 31, 2026, taking place in and around San Dieguito River Park and Black Mountain Park in northern San Diego County. The event features two primary distance options—a 30-mile route and a 50-plus-mile route—both starting from the San Pasqual Staging Area near Bandy Canyon Road in Escondido. The 30-mile course follows an out-and-back format, while the longer route continues into Black Mountain Park and includes additional trail segments arranged in a lollipop-style loop.
The course travels across a mix of wide multi-use trails and narrower singletrack, with terrain described as generally fast and flowing and suitable for a range of riding abilities. Routes are fully marked, and multiple feed stations are positioned along the course. Because the trails remain open to the public during the event, riders are expected to share the route with hikers, equestrians, and other trail users, particularly in areas with switchbacks and limited sightlines.
In addition to the main rides, the event includes a short kids’ ride held earlier in the morning, with on-site and online registration available. The Filthy 50+ typically offers multiple rider categories based on distance, age, and equipment, as well as timing and results tracking. Registration is expected to open in summer 2026 and will close once capacity is reached or shortly before the event date.
Here’s a video about the 2022 race: