Skip to event navigation Skip to main content

Clo Cow Half Marathon, 10K & 5K

13th Annual

October 12, 2025

Join us on October 12, 2025 for the Clo Cow Half Marathon, 10K & 5K in charming Historic Downtown Petaluma! Wind your way through picturesque Sonoma County farmland and rolling hills, where friendly sheep, horses—and of course Moo-Cows—will cheer you on every step of the way. Sure, those climbs are a challenge, but the sweeping country views at the top are well worth the effort!

689022aceae28.jpg
The 5K and 10K is sold out

These options are available:
1. Join the waitlist and only be charged if your registration is accepted
2. Transfer from someone unable to attend. Use the transfer button on this page

Please be cautious and don't send money to a stranger unless you are 100% sure they have a legitimate entry. There are scammers on social media pretending to have entries to sell.

Registration fees

Prices are inclusive of mandatory charges, items, and fees

Half Marathon Spots remaining: 10

Registration closes in 5 days 5 hours

  • Includes T-Shirt, Cowbell medal, Post-race food

    1. $88.58

      $82 + Processing Fee

      Mar 21 – Apr 30
    2. $92.84

      $86 + Processing Fee

      May 1 – Jul 31
    3. $99.23

      $92 + Processing Fee

      Aug 1 – Sep 30
    4. $104.56

      $97 + Processing Fee

      Now registering Oct 1 – Oct 12
      Register for Half Marathon

10K Sold out

Registration closes in 5 days 5 hours

  • Includes T-Shirt, Cowbell medal, Post-race food

    1. $67.28

      $62 + Processing Fee

      Mar 21 – Apr 30
    2. $71.54

      $66 + Processing Fee

      May 1 – Jul 31
    3. $77.93

      $72 + Processing Fee

      Aug 1 – Sep 30
    4. $82.19

      $76 + Processing Fee

      Now registering Oct 1 – Oct 12

5K Sold out

Registration closes in 5 days 5 hours

  • Includes T-Shirt, Cowbell medal, Post-race food

    1. $49.18

      $45 + Processing Fee

      Mar 21 – Apr 30
    2. $54.50

      $50 + Processing Fee

      May 1 – Jul 31
    3. $59.83

      $55 + Processing Fee

      Aug 1 – Sep 30
    4. $65.15

      $60 + Processing Fee

      Now registering Oct 1 – Oct 12

5K Waitlist

Registration closes in 5 days 5 hours

  • Your card will only be charged if accepted

    1. $59.83

      $55 + Processing Fee

      Mar 21 – Sep 30
    2. $65.15

      $60 + Processing Fee

      Now registering Oct 1 – Oct 12
      Register for 5K Waitlist

10K Waitlist

Registration closes in 5 days 5 hours

  • Your card will only be charged if accepted

    1. $77.93

      $72 + Processing Fee

      Mar 21 – Sep 30
    2. $82.19

      $76 + Processing Fee

      Now registering Oct 1 – Oct 12
      Register for 10K Waitlist

Youth Discount

Registrants under 18 receive a $10 discount at checkout (applies to all distances)

Top donors

No. Name Amount
1 Marcia Keasler $107.35
2 Catherine Bevanda $107.35
3 Trang Nguyen $107.35
4 Jackie Magliari $107.35
5 Anonymous $54.10
6 Geri Johnston $54.10

Contact information

Event contact
Chris Mason
Website
Visit website