Marathon races near Oxnard-Thousand Oaks-Ventura, CA

Oxnard Ventura Training Notes

Oxnard-Thousand Oaks-Ventura, CA hosts 4 Marathon races in 2026 within 80 km of the city centre — upcoming dates, recurring series, and other races nearby, all in one place.

Ventura Beach gives locals an easy coastal five-mile run with 16 m of gain when the legs need Z2. Riverpark gives the neighborhood 5K rhythm on bike paths and sidewalks from Windrow Park. Riverpark loops out to 54 km and 92 m of gain when flat miles feel too soft. Oxnard Run Club meets Tuesday at 6:30pm in Oxnard, and Conejo Valley Run Club meets Wednesday at 6pm at Tarantula Hill Brewing Co. Santa To The Sea 1/2 Marathon, 1/4 Marathon & 5K, Mountains 2 Beach Marathon, and XTerra Boney Mountain 20k are the anchor events.

I do 1 km with 789 m of elevation gain on paved roads. I do 7 km and 189 m of gain. I do 5 km with only 3 m of gain when the plan is tempo, not climbing. THOUSAND OAKS 54M WEEKEND RIDE starts at W Hillcrest Dr and W Wilbur Rd, then stacks 940 m of ascent over 54 miles. CHANNEL ISLANDS BICYCLE CLUB has been around since 1990, and Cool Breeze Century is the August anchor.

Summer puts Riverpark on repeat, with the weekly 5K Summer Series starting and ending at Windrow Park. Cool Breeze Century keeps August busy for cyclists who want a proper target. Locals use Ventura Beach, Hueneme Road, and the coast-side roads for steady base miles when the heat says keep it honest. Winter keeps the riding calendar simple because Ventura County has great, year-round riding out of Ventura and Moorpark/Camarillo. Runners keep rotating club nights, while trail legs still look toward Boney Mountain and Wildwood when intervals need bite.