FOURmidable

Sat, Feb 20, 2027, 8:00 AM EST

Location: Auburn, CA; 855 Pacific ave, 95603
Type: TRAIL

Official registration

At a glance

Double-check key details

A challenging 50K trail race in Auburn, CA, set on mountainous terrain.

Great for: runners training for a serious effort

The FOURmidable 50K is a trail race in Auburn, CA, offering a demanding experience on mountainous terrain. This event is designed for runners seeking a significant challenge on natural surfaces. Participants can expect a straightforward registration and bib pickup process, focusing on the core running experience.

What to expect

Easy mobile sign-up process.
Streamlined packet and bib pickup on race day.

Standout details

50K trail race
Mountainous terrain
Mobile sign-up
Race day bib pickup

Auto-drafted from the public listing — confirm details on the official event page before signing up.

Distances & registration

4 options

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

13K
Sat, Feb 20, 8:45 AM EST · From $43.40
Opens Feb 18, 2026, 7:00 PM EST · Closes Oct 31, 2026, 5:00 AM EDT
13.4 Miles
Sat, Feb 20, 8:30 AM EST · From $54.00
Opens Feb 18, 2026, 7:00 PM EST · Closes Oct 31, 2026, 5:00 AM EDT
35K
Sat, Feb 20, 8:15 AM EST · From $64.60
Opens Feb 18, 2026, 7:00 PM EST · Closes Oct 31, 2026, 5:00 AM EDT

+ 1 more option

50K
Sat, Feb 20, 8:00 AM EST · From $85.80
Opens Feb 18, 2026, 7:00 PM EST · Closes Oct 31, 2026, 5:00 AM EDT

Vibe Check

Serious Test

Trail + hills, longer distance

Mostly trail

Based on terrain, weather, and distance data.

The course

Trail
Hilly

From the organizer

Use this page to sign up for FOURmidable trail race starting Feb 20, 2026 up until the start of the race. Simply sign up using your smart phone and the system will automatically add you to the packet pick up roster. After signing up, line up to pick up your bib in the correct line.

Also in this area

Easier options nearby

Lower-difficulty races in the same state.