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MULTIDAYRUNNING
Fixed-Distance

Grindstone 100M

A 104-mile mountain loop west of Virginia's Shenandoah Valley with roughly 21,000 ft of climbing and a 36-hour limit.

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
DateSep 18-20, 2026
LocationNatural Chimneys Park, Virginia, USA
FormatFixed-Distance
TerrainMountain
RegionNorth America
Distance104 mi
State / areaVirginia (VA)
Course modelLoop
Elevation gainApproximately 21,000 ft
Cutoff36 hours
Start6:00 PM Friday
HighlightsUTMB World Series, Wild Oak Trail

Course & Terrain

Mountain loop from Natural Chimneys Park using forest roads, ridgelines, and technical singletrack.

Entry & Logistics

Listed qualification and support details
Registration and feesCheck the official event website for current availability, deadlines, prices, taxes, and refund terms.

Why This Race Matters

Grindstone 100M 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.
  • Train for terrain-specific fatigue. Technical trails and mountain courses demand downhill durability, hiking efficiency, and reliable night lighting.
  • The directory does not mark this as having simpler logistics. Confirm qualification, terrain, support, registration, medical, and withdrawal requirements before planning around it.
  • Large cumulative climbing
  • Mandatory trail work for 100-mile entrants

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 18, 2026. Organizers can revise details after review.

  1. Official Grindstone 100M page — https://grindstone.utmb.world/races/100M
  2. Multiday Running event directory review scope: August 18, 2026.