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MULTIDAYRUNNING
🏁 Fixed-Distance

Coldwater Hundred — 100 Mile

A 101.3-mile desert loop race at Estrella Mountain Regional Park, combining two shorter red loops and three longer blue loops with a 32-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
DateJan 16-17, 2027
Location🇺🇸 Estrella Mountain Regional Park, Goodyear, Arizona, USA
FormatFixed-Distance
TerrainDesert
RegionNorth America
Distance101.3 mi
State / areaArizona (AZ)
Course modelLoop
Edition noteThe 2027 event page was current at review but still linked the 2026 runner guide.
Elevation gain8,687 ft
Cutoff32 hours, finishing by 3:00 PM Sunday
Start7:00 AM
HighlightsSierra Estrella Foothills, Five-Loop Course

Course & Terrain

Two approximately 10-mile red loops followed by three approximately 27-mile blue loops, with four returns through the start and finish operation before completion.

Key course features to know before comparing this race:

  • Estrella Mountain Competitive Track race base
  • Rolling Sierra Estrella desert trails and washes

Crushed-granite singletrack, rocks, boulders, sandy washes, jeep roads, and dry wash beds create more technical running than the modest maximum elevation suggests.

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 current page lists final-loop and Horse Thief departure cutoffs. Use the final 2027 guide for crew, pacer, drop-bag, and soft-cutoff details.

Why This Race Matters

Coldwater Hundred — 100 Mile 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.
  • Heat, sun, and dry air require event-specific preparation. Test sun protection and cooling, drink in response to thirst, and remember that sodium cannot make overdrinking safe.
  • The directory does not mark this as having simpler logistics. Confirm qualification, terrain, support, registration, medical, and withdrawal requirements before planning around it.
  • Large day-to-night temperature swings are possible
  • The listed distance is 101.3 miles rather than exactly 100

Event FAQs

How is the Coldwater 100 course arranged?

The official 2027 page describes two roughly 10-mile red loops followed by three roughly 27-mile blue loops and separately lists the full course at 101.3 miles.

What is the Coldwater Hundred cutoff?

The event lists a 32-hour limit with a 3:00 PM Sunday finish cutoff and earlier departure deadlines.

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 Coldwater Hundred page and cutoff details — https://www.aravaiparunning.com/coldwater/
  2. Multiday Running event directory review scope: August 10, 2026.