California · 10K · 5K · Half Marathon
Clo Cow Half Marathon, 10K & 5K
Clo Cow Half Marathon, 10K & 5K is a 10K, 5K and half marathon event held in Petaluma, California. It was last held on October 11, 2026 and is usually run in October; the next date hasn't been announced yet.
- Usually held
- October
- Location
- Petaluma, CA
Race details
- Last held
- October 11, 2026
- Usually held in
- October
- Location
- Petaluma, California
- Distances
- 10K, 5K, Half Marathon
- Course
- Hilly out-and-back course: a steady climb heading out of downtown Petaluma into farmland, cresting near the halfway point of the half marathon before a long downhill/rolling return; no official elevation profile published.
- Registration
- raceroster.com
Registration, course & weather
- Registration status
- Registration status as last checked September 26, 2026: open
- Start time
- 7:30 AM PDT
- Course profile — Half Marathon
- Out-and-back course; Road surface
- Course profile — 10K
- Out-and-back course; Road surface
- Course profile — 5K
- Out-and-back course; Road surface
- Typical race-day weather
- about 48°F at the start, 94% humidity, 4 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 26, 2026)
About the Clo Cow Half Marathon, 10K & 5K
The Clo-Cow Half Marathon, 10K & 5K is an annual out-and-back road race starting and finishing in Historic Downtown Petaluma, California, sending runners out into rolling Sonoma County farmland past cows, sheep, and horses before returning to a hometown finish on Kentucky Street. First run in 2010 (as the Moo-Cow), it benefits the Petaluma Educational Foundation and local school sports programs.
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Guides from the RaceRove blog
- 8 min read How to Choose the Best Half Marathon for a PR, Racecation or 50-State Challenge The best half marathon depends on what you want from it. How to choose a course for a personal record, a race worth travelling for, or an efficient stop on a 50-state challenge.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 9 min read How to Run a Race in All 50 States How to plan a 50-state running challenge: set your own rules, group states into trips, build a calendar around the seasons, budget for it and keep track of every finish.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Clo Cow Half Marathon, 10K & 5K: common questions
- When is the Clo Cow Half Marathon, 10K & 5K?
- The next date hasn't been announced in the listing yet. The race is usually held in October. Check the organiser's website for the official date.
- Where is the Clo Cow Half Marathon, 10K & 5K held?
- In Petaluma, California.
- What distances does the Clo Cow Half Marathon, 10K & 5K offer?
- 10K, 5K and Half Marathon.
- How do I register for the Clo Cow Half Marathon, 10K & 5K?
- Registration is handled by the organiser at raceroster.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Clo Cow Half Marathon, 10K & 5K?
- Registration status as last checked September 26, 2026: open.
- What time does the Clo Cow Half Marathon, 10K & 5K start?
- 7:30 AM PDT.
- What is race-day weather usually like at the Clo Cow Half Marathon, 10K & 5K?
- about 48°F at the start, 94% humidity, 4 mph wind (based on the 2025 race day, measured near the city center rather than the exact start line; Open-Meteo, checked September 26, 2026).
Plan this race in RaceRove
Save it to your plan, compare it with other races, check typical race-day weather and track your 50-state progress in the interactive app.