What races qualify for AC100?
How to qualify without wasting a season.
Free Guides
Practical, plain-English AC100 and San Gabriel trail running guides. Start with the eight live guides below, then check back as new ones launch.
Last updated: 2026-02-18
Which guides should you start with?
Start with the topic that is your current bottleneck, then move to related guides to fill gaps in logistics, heat strategy, and race execution.
How do I plan crew and pacers for AC100?
Simple timeline and handoff system for race day.
Where can I get water along Angeles Crest Highway on AC100 weekend?
Water planning for crews and runners on Highway 2.
Which San Gabriel long run routes actually prepare you for AC100?
What to change when temps rise in the San Gabriels.
How do you run safely in SoCal heat while training for AC100?
Heat control, pacing, and bailout decisions for summer runs.
What gear do I need for night trail runs before AC100?
One-page pre-run checklist for dark mountain miles.
What is a simple ultra nutrition plan for AC100 training runs?
Simple fueling framework for SoCal long runs and race day.
What should taper week look like before an ultramarathon like AC100?
Cut volume, keep rhythm, and arrive ready to execute.
AC100 Drop Bag Checklist
Coming soon.
AC100 Race Week Timeline
Coming soon.
First 100K to First 100-Miler Plan
Coming soon.
SoCal Heat Block Training Week
Coming soon.
Crew Briefing Template (One Page)
Coming soon.