October 11, 2026
Join us on October 11, 2026 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!
Registration fees
Where pricing applies, shown amounts include mandatory charges, items, and fees.
Half Marathon
Registration closes in 1 day 17 hours-
Includes T-Shirt, Cowbell medal, Post-race food
-
$91.78
$85 + Processing Fee
Jan 15 – Apr 30 -
$94.97
$88 + Processing Fee
May 1 – Jul 31 -
$107.75
$100 + Processing Fee
Aug 1 – Sep 30 -
Register for Half Marathon$113.08
$105 + Processing Fee
Now registering Oct 1 – Oct 11
-
10K Spots remaining: 23
Registration closes in 1 day 17 hours-
Includes T-Shirt, Cowbell medal, Post-race food
-
$68.35
$63 + Processing Fee
Jan 15 – Apr 30 -
$72.61
$67 + Processing Fee
May 1 – Jul 31 -
$85.39
$79 + Processing Fee
Aug 1 – Sep 30 -
Register for 10K$91.78
$85 + Processing Fee
Now registering Oct 1 – Oct 11
-
5K Sold out
Registration closes in 1 day 17 hours-
Includes T-Shirt, Cowbell medal, Post-race food
-
$50.24
$46 + Processing Fee
Jan 15 – Apr 30 -
$54.50
$50 + Processing Fee
May 1 – Jul 31 -
$59.83
$55 + Processing Fee
Aug 1 – Sep 30 -
$65.15
$60 + Processing Fee
Now registering Oct 1 – Oct 11
-
Youth Discount
Registrants under 18 receive a $10 discount at checkout (applies to all distances)
Top donors
| No. | Name | Amount |
|---|---|---|
| 1 | Anonymous | $107.35 |
| 2 | Barbara Hancock | $107.35 |
| 3 | Jennifer Christensen | $107.35 |
| 4 | Sebastian Aguilar | $54.10 |
| 5 | Luci Mendoza | $54.10 |
| 6 | Hannah Lee | $27.48 |
Contact information
- Event contact
- Event Team
- Website
- Visit website
Event schedule
- Sun, October 11, 2026 7:30 AM - Half Marathon Start
- Sun, October 11, 2026 7:35 AM - 10K Start
- Sun, October 11, 2026 7:45 AM - 5K Start
