Grindstone Trail Running Festival - 100M 2026
The forecast arrives five days before the start.
Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 16 aid stations to plan your nutrition and hydration segment by segment.
What's your time based on your UTMB?
Times estimated by the RAVIT model, learned from real ultra-trail finish times. Enter your UTMB Index (utmb.world) to get a personalized estimate.
Predicted race time based on your UTMB Index® · smoothed times achieved by runners at your level in past editions
'%20d='M128.83%2011.31h142.21v60.44H128.83z'%3e%3c/path%3e%3cpath%20d='M0%2071.75V24.24h13.11v36h16.22v11.51ZM31.92%2071.75V24.24H45v47.51ZM76.64%2071.75H62.45L47.12%2024.24h14.06l.7%202.6%203.42%2012C67%2044.83%2068%2049%2069.16%2055l.38%202%20.38-2c1.21-6%202.16-10.13%203.87-16.08l3.42-12%20.69-2.6H92ZM93.86%2035.77V24.24h31.67v11.53Zm0%2036V42.23h31.67v11.53H107v6.46h18.56v11.53Z'%3e%3c/path%3e%3cpath%20d='m56.49%2017.88%201.45-2.85%203.39-6.66%203.46%206.44%205.99%2011.12%205.91-10.53h49.52v-4H74.48l-1.77%203.15-1.86%203.32-1.73-3.2L61.23%200l-7.05%2013.88H31.94v4H56.49z'%3e%3c/path%3e%3cg%20fill='%23fff'%3e%3cpath%20d='M146.79%2066.48h-7.62V25.85h-7.68v-8.53h23.09v8.53h-7.79ZM191.86%2066.48h-9.28l-15-25.73h8.84a8.73%208.73%200%200%200%202.85-.46%206.26%206.26%200%200%200%202.34-1.38%206.41%206.41%200%200%200%201.58-2.33%209%209%200%200%200%20.58-3.38%208.17%208.17%200%200%200-.61-3.28%206.91%206.91%200%200%200-1.6-2.3%206.72%206.72%200%200%200-2.32-1.38%208.73%208.73%200%200%200-2.82-.46h-10.69v40.7h-7.67V17.25h18.5a22.43%2022.43%200%200%201%205.3.62%2010.85%2010.85%200%200%201%204.75%202.66%2016%2016%200%200%201%203.59%205.38%2017.06%2017.06%200%200%201%201.28%206.57%2020.77%2020.77%200%200%201-1%206.37%2015.85%2015.85%200%200%201-2.88%205.38%2010.94%2010.94%200%200%201-3.2%202.66%2017.2%2017.2%200%200%201-3.7%201.34ZM231.19%2017.32v49.16h-7.68V33.53l-19.06%2033h-9.22l29-49.16ZM235.06%2017.25h7.56v49.23h-7.56ZM246.1%2017.18h7.68V58h12.59v8.47H246.1Z'%3e%3c/path%3e%3c/g%3e%3c/svg%3e){kind=small}
Cut-off times and crew - Grindstone Trail Running Festival - 100M · 2026
Data from the official race rules, checked for every edition. The race rules prevail. Positions are interpolated along the GPX track and are a guide, not official course marking.
What you'll find at each aid station
| Product | Lick Run 1km 9.2 | Wolf Ridgekm 18.6 | Reddish Knobkm 32.9 | Little Bald Knobkm 39.3 | North River Gap 1km 53.2 | Lookout Mountainkm 62.3 | Dowell’s Draft 1km 74.5 | Dry Branch Gap 1km 85.5 | Cold Springskm 96.9 | Dry Branch Gap 2km 105.8 | Dowell’s Draft 2km 116.8 | Magic Mosskm 125.4 | Camp Toddkm 133.5 | North River Gap 2km 149.7 | Lick Run 2km 162.1 | Finishkm 169.3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water | available | available | available | available | available | available | available | available | available | available | available | available | available | available | available | available |
| Brand products · Näak | available | available | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable | unavailable | available | available |
| Hot meal | unavailable | unavailable | available | available | available | available | available | available | available | available | available | available | available | available | unavailable | unavailable |
La feuille de ton assistance pour Grindstone Trail Running Festival - 100M · 2026
Ton assistance peut te voir à ces postes. Ton plan RAVIT y met tes heures, ce qu'elle te tend et la route pour y aller.
- North River Gap 1km 53.2
- Dowell’s Draft 1km 74.5
- Dowell’s Draft 2km 116.8
- Camp Toddkm 133.5
- North River Gap 2km 149.7
Recto, verso et planche d'étiquettes, en PDF : l'exemple d'une coureuse de l'UTMB.
Elevation profile
The course and its aid stations
Grindstone Trail Running Festival - 100M: times, aid-station stops and fuelling needs by UTMB® Index
Between a UTMB® Index of 500 and 800, the estimated finish time on this race runs from 33h52 to 20h51. These times include aid-station stops: they come from real durations between two timing points, and this race's timing does not measure stops separately.
SourceBelow a UTMB® Index of roughly 440, the overall cut-off of 36h00 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|
| 500 | 33h52 | 16.9 | 2,032 g | 23.7 L | 16,933 mg | +2h08 |
| 550 | 30h21 | 13.4 | 1,821 g | 21.2 L | 15,175 mg | +5h39 |
| 600 | 28h51 | 11.9 | 1,731 g | 20.2 L | 14,425 mg | +7h09 |
| 650 | 26h51 | 10 | 1,611 g | 18.8 L | 13,425 mg | +9h09 |
| 700 | 24h18 | 10 | 1,458 g | 17 L | 12,150 mg | +11h42 |
| 750 | 22h31 | 10 | 1,351 g | 15.8 L | 11,258 mg | +13h29 |
| 800 | 20h51 | 10 | 1,251 g | 14.6 L | 10,425 mg | +15h09 |
Figures based on 60 g of carbohydrate, 700 mL of fluid and 500 mg of sodium per hour, "average" preparation and mild conditions (15–25 °C). Above 25 °C, count on roughly 900 mL/h and 700 mg/h. Carbohydrate intake is trained: 60 g/h is a floor, 90 g/h assumes a glucose-fructose blend and a gut used to it.
Measured on the 2026 edition: the field checkpoint by checkpoint
230 starters, 47.4% DNF rate, 16 timed checkpoints.
| Segment | km | Median | Middle half | Measured | Median passage | Still ranked |
|---|---|---|---|---|---|---|
| Natural Chimneys → Lick Run - 1 | 9.2 | 1 h 03 | 59 min – 1 h 08 | 189 | 1 h 02 | 230 |
| Lick Run - 1 → Wolf Ridge | 18.6 | 1 h 25 | 1 h 17 – 1 h 32 | 189 | 2 h 24 | 230 |
| Wolf Ridge → Reddish Knob | 33 | 2 h 44 | 2 h 28 – 2 h 58 | 226 | 4 h 58 | 227 |
| Reddish Knob → Little Bald Knob | 39.4 | — | — – — | 0 | — | 196 |
| Little Bald Knob → North River Gap - 1 | 53.2 | — | — – — | 0 | 8 h 31 | 196 |
| North River Gap - 1 → Lookout Mountain | 62.4 | — | — – — | 0 | — | 169 |
| Lookout Mountain → Dowells Draft - 1 | 74.6 | — | — – — | 0 | 13 h 10 | 169 |
| Dowells Draft - 1 → Dry Branch Gap - 1 | 85.6 | 1 h 51 | 1 h 44 – 1 h 58 | 167 | 15 h 05 | 169 |
| Dry Branch Gap - 1 → Cold Springs | 96.6 | — | — – — | 0 | — | 134 |
| Cold Springs → Dry Branch Gap - 2 | 105.5 | — | — – — | 0 | 19 h 19 | 134 |
| Dry Branch Gap - 2 → Dowells Draft - 2 | 116.5 | 1 h 54 | 1 h 44 – 2 h 00 | 129 | 21 h 07 | 131 |
| Dowells Draft - 2 → Magic Moss | 125.2 | 2 h 29 | 2 h 15 – 2 h 38 | 123 | 23 h 30 | 126 |
| Magic Moss → Camp Todd | 133.2 | 1 h 34 | 1 h 23 – 1 h 42 | 121 | 25 h 17 | 123 |
| Camp Todd → North River Gap - 2 | 149 | 4 h 07 | 3 h 41 – 4 h 24 | 119 | 29 h 29 | 121 |
| North River Gap - 2 → Lick Run - 2 | 161.5 | 2 h 40 | 2 h 21 – 2 h 53 | 108 | 32 h 23 | 121 |
| Lick Run - 2 → Natural Chimneys | 168.6 | 1 h 10 | 59 min – 1 h 20 | 108 | 33 h 26 | 121 |
“Median passage” is elapsed time from the start, not a clock time: the clock time depends on the edition.
Where runners drop out. Dry Branch Gap - 1 (35) · Reddish Knob (31) · North River Gap - 1 (27) out of 109 total DNFs.
RAVIT record from the official timing of the 2026 edition, data from September 29, 2026.
SourceOther trails worth preparing for
- Pinhoti 100162 km · 3,750 m D+ · October 31, 2026
- Javelina Jundred 100 miler158 km · 1,688 m D+ · October 31, 2026
- Mamba 100161 km · 143 m D+ · November 6, 2026
- Tunnel Hill 100161 km · 355 m D+ · November 7, 2026
- Rio Del Lago161 km · 2,697 m D+ · November 7, 2026
- Spirit of Syllamo 100152 km · 5,023 m D+ · December 12, 2026
- Beast of the East163 km · 5,328 m D+ · December 12, 2026
- Coldwater Rumble 100161 km · 2,171 m D+ · January 16, 2027
- SUFFERFEST161 km · 7,024 m D+ · January 30, 2027
Grindstone Trail Running Festival - 100M over the years
Sources and method
- Time projection — times by UTMB Index are taken from the actual splits of runners in each level band on previous editions of this race, aid station stops included. No formula is used as long as these results exist.
- Trail nutrition — hourly targets for carbohydrate, fluid and sodium follow the commonly accepted ultra-endurance guidance. La Clinique du Coureur — Fuelling in trail running
- Course, aid stations and cut-offs — taken from the event's official rules, which prevail in case of any discrepancy. Official site — Grindstone Trail Running Festival - 100M
Weather for Grindstone Trail Running Festival - 100M
The weather for Grindstone Trail Running Festival - 100M will appear here as soon as the forecast models reach that date, around five days before the start: feels-like temperature, rain, snow, wind and storms, section by section and at your passage time.
Detailed weather for Grindstone Trail Running Festival - 100M, hour by hour on the courseFrequently asked questions
How many checkpoints?
Grindstone Trail Running Festival - 100M has 16 checkpoints: 16 aid stations. Details are in the two tables above.
What's the longest segment without aid?
The one leading to North River Gap 2: 16.2 km and 0 m elevation gain. That's the one to load up for first.
How do I find the exact location of an aid station?
The Google Maps icon in the “Access” column opens the aid station's location: handy for planning your crew's routes.
What distance and elevation gain?
Grindstone Trail Running Festival - 100M is 169 km long with 5532 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 28h51 for Grindstone Trail Running Festival - 100M.
What's the weather forecast?
The weather for Grindstone Trail Running Festival - 100M will be published on this page around five days before the start, once the forecast models reach the race date. It will be detailed section by section: feels-like temperature, rain, snow, wind and storms.
Want to stack the odds in your favor for Grindstone Trail Running Festival - 100M?
In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.
No card required · Instant results