Run by the Sea

Sun, Oct 4, 2026, 8:15 AM PDT

Location: Santa Cruz, CA; Wilder Ranch State Park, 95060
Type: RUN

Vibe analysis coming soon

Course feel, difficulty, and community fit are being added to this listing. Check back, and always confirm details on the official registration page.

Distances & registration

3 options

Registration for all distances is through the official signup link above.

4K
Sun, Oct 4, 8:30 AM PDT · From $48.70
Opens Jan 6, 2026, 5:12 AM PST · Closes Jun 1, 2026, 7:59 PM PDT
12K
Sun, Oct 4, 8:15 AM PDT · From $59.30
Opens Jan 6, 2026, 5:12 AM PST · Closes Jun 1, 2026, 7:59 PM PDT
Run by the Sea Half Marathon
Sun, Oct 4, 8:00 AM PDT · From $75.20
Opens Jan 6, 2026, 3:59 AM PST · Closes Apr 2, 2026, 7:59 PM PDT

Vibe Check

Push Potential

Trail + hills

Mostly trail

Based on terrain, weather, and distance data.

The course

From the organizer

Run by the Sea returns to lovely Wilder Ranch State Park on Sunday, October 4th! This unique Half Marathon, 12K run, and 4K run/walk meanders along the gorgeous coastal bluffs of California's Central Coast in Santa Cruz and consists mostly of flat, packed dirt trails. Participants will enjoy scenic coastal views while passing along the bluffs and Wilder Ranch park trails. Get ready to take in the natural beauty of the Monterey Bay, the serene flats of Wilder Ranch's meadows, and maybe even catch a glimpse of some dolphins - no other race is quite like it!

Now in its 10th year, Run by the Sea is organized by the Santa Cruz Track Club and benefits the track club's youth program, Bike Santa Cruz County, and Santa Cruz Mountain Trail Stewards.

Race Headquarters and Parking

4K Route

12K Route

Half Marathon Route

Also in this area

Easier options nearby

Lower-difficulty races in the same state.

More demanding options nearby

Higher-difficulty races in the same state.