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MULTIDAYRUNNING
🏁 Fixed-Distance

Rio Del Lago 100 Mile Endurance Run

A varied Northern California 100-miler combining Folsom-area loops with an out-and-back trail journey into the Sierra foothills and a 30-hour cutoff.

Official WebsiteBack to Events

Event dates, entry rules, qualification standards, and course details can change. Always verify current information on the official event website before registering or booking travel.

Event Overview

Listed edition overview
DateNov 7-8, 2026
Location🇺🇸 Beal's Point, Granite Bay, California, USA
FormatFixed-Distance
TerrainMixed
RegionNorth America
Distance100 mi
State / areaCalifornia (CA)
Course modelMixed
Edition noteThe final 2026 runner guide was still pending at the August 10 directory review.
Elevation gain13,874 ft
Elevation loss13,874 ft
Cutoff30 hours
HighlightsFolsom Lake, Auburn State Recreation Area

Course & Terrain

Hybrid course with short Beal's Point and Lake Natoma loops followed by an out-and-back trail journey toward Cool and the Auburn State Recreation Area.

Key course features to know before comparing this race:

  • American River parkway and Folsom Lake terrain
  • Fire roads and Sierra-foothill singletrack

Paved parkway, fire road, and foothill singletrack create meaningful changes in surface, grade, and pace across the race.

Entry & Logistics

Listed qualification and support details
Registration and feesCheck the official event website for current availability, deadlines, prices, taxes, and refund terms.
Logistics noteThe organizer had updated the 2026 pace chart by verification, while the linked runner guide still showed 2025. Use the current site and final 2026 guide when released.

Why This Race Matters

Rio Del Lago 100 Mile Endurance Run is a useful reference point for runners comparing long fixed-distance ultras that still unfold over multiple days. Its format, terrain, and support model shape the kind of preparation required: not just fitness, but pacing discipline, nutrition planning, foot care, and the ability to make good decisions under fatigue.

Planning Notes

  • Prepare for sleep decisions, weather swings, and aid-station discipline. The distance is only one part of a multi-day fixed-distance race.
  • Treat intermediate cutoff gates as part of the course. Build enough margin for aid stops and late-race slowdown, and verify every current gate in the official rules.
  • The directory does not mark this as having simpler logistics. Confirm qualification, terrain, support, registration, medical, and withdrawal requirements before planning around it.
  • Do not treat the still-linked 2025 runner guide as final 2026 instructions
  • The hybrid course requires different pacing across loops and trail sections

Event FAQs

What is the Rio Del Lago 100 cutoff?

The official 2026 pace chart lists a 30-hour finish limit.

Is Rio Del Lago one continuous loop?

No. The official course combines shorter loops with a longer out-and-back trail section.

Verification & Sources

Verification scope: the listed edition's date, location, format, and available logistics were checked against the event-specific official sources below during the directory review dated August 10, 2026. Organizers can revise details after review.

  1. Official Rio Del Lago 100 site, rules, and results — https://www.rio100mile.com/
  2. Multiday Running event directory review scope: August 10, 2026.