Silverton, US · July 2026
Hardrock Hundred Endurance Run
Hardrock Hundred Endurance Run pacing strategy with effort-based splits, nutrition timing, and course-specific risk notes for the 164.9 km ultra.
- Distance
- 164.90 km
- Elevation gain
- 8893 m
- Typical temp
- 0–25 °C
- Cutoff
- 48:00:00
The short version
A brutal course
- ▸Big climbing day — 8893 m up. Pace the ascents on effort, not the clock.
- ▸Low sun in your eyes around km 85 — bring a cap or shades.
- ▸Full overhead sun from km 22 — sunscreen and run the shaded side.
Next edition
10 July 2026
Typical race-day conditions
0–25 °C
We lock the real forecast into your plan in race week.
Course difficulty
BrutalDriven by 8893 m of climbing, altitude up to 4247 m, 8895 m of quad-pounding descent. Harder than Eiger Ultra Trail E101 (10.0), easier than Hong Kong 100 Ultra Marathon (10.0) — tougher than 80% of the races we cover.
Race data quality
Medium confidence
Last verified: 24/05/2026
Seeded as an approximate high-altitude ultra. Full paid confidence requires direction-specific course files and segment-level altitude validation.
Elevation profile
Verified profile
Paid strategy guardrail
Official race packet remains source of truth
Step 1 · Free preview
See the course-adjusted plan first
Enter one recent result. The preview returns course cost, first splits, and fuel target from the deterministic engine and the current course data model.
VDOT
49.1
Estimate
22:24:18
Course cost
+575:06
Fuel target
90 g/h
First 5 km preview
full race locked
- km 17:02
- km 25:05
- km 37:15
- km 45:11
- km 511:58
First race free · then €7 Race Pass · no monthly subscription
Uses an approximate course model; verify final logistics against the official race packet.
Step 2 · Your full Hardrock Hundred Endurance Run plan
The preview shows the shape. The plan races it for you.
Course preview
Free
what you see now
- ✓Difficulty score & course data
- ✓Course-cost & toughest km
- ✓Your first full plan free, ever
Race Pass
€7
one-time, this race
- ✓Every km split, weather-adjusted
- ✓Nutrition & fluid timeline
- ✓Heat, wind & sun race tactics
- ✓Danger zones + watch file (GPX)
- ✓Race-week forecast & reminders
Annual
€19
per year, every race
- ✓Everything in Race Pass
- ✓Unlimited races, all year
- ✓Re-plan as your fitness changes
No subscription required — one race is a one-off €7. Cancel anytime on Annual.
Continue with approximate course data →Course elevation
8893 m total gain · 8895 m loss · max 4247 m, min 2350 m.
Fly the course
At San Juan high altitude loopSun & shade
Sun in your eyes
1 km
Sun on your back
40 km
Side / overhead
54 km
Expect low sun roughly in your eyes around km 85 — pack a peaked cap or shades; low glare hides kerbs and potholes. From km 22 the sun sits high overhead — peak UV and radiant heat, so keep sunscreen on and run the shaded side of the road where you can.
Approximate — solar position from the route geometry and a 06:00:00 start (timezone estimated from longitude), for a mid-pack finishing time.
Signature sections
San Juan high altitude loop · km 0–164.9
Sustained high-altitude climbing and descending; altitude cost dominates flat pace assumptions.
Aid stations
13 stations on course — plan your fueling around them.
Race overview
Hardrock is one of the most demanding 100-mile races in the world: high altitude, huge vertical gain, technical terrain, and long exposure in the San Juan Mountains. The model should prioritize altitude-aware effort caps and conservative descent loading over target pace precision.
How hard is this course?
Reference table — how the Hardrock Hundred Endurance Run compares to a flat sea-level course for four typical fitness levels. Computed from the route profile, mean course altitude, and typical race-week climate (13 °C / 45 % humidity). Your personal strategy uses your VDOT, per-km splits, nutrition timing, and the typical climate baseline for this static sample; paid strategies use Open-Meteo when a verified race date is inside the forecast window.
| Runner | Flat-course finish | Hardrock Hundred Endurance Run finish | Course cost | Adjusted pace |
|---|---|---|---|---|
| Beginner (VDOT 35) | 16:47:58 | 29:21:36 | +74.8% | 6:52/km |
| Intermediate (VDOT 45) | 13:44:43 | 24:01:19 | +74.8% | 5:37/km |
| Trained (VDOT 50) | 12:37:33 | 22:03:57 | +74.8% | 5:09/km |
| Competitive (VDOT 60) | 10:53:36 | 19:02:16 | +74.8% | 4:27/km |
Reference nutrition
For a 70 kg runner finishing in 22:03:57 at 13 °C. Adjust to your weight and tolerance — these are ISSN-window targets, not prescriptions.
- Carbs / hour
- 90 g
- Total carbs
- 1986 g
- Fluid / hour
- 640 ml
- Sodium / hour
- 500 mg
FAQ
How should I pace Hardrock Hundred Endurance Run?
Treat the preview as an effort plan, not a fixed road-marathon pace table. The course model includes 10140 m of climbing, so climbs, descents, heat, and aid-station timing matter more than average pace.
How reliable is the current course data?
Seeded as an approximate high-altitude ultra. Full paid confidence requires direction-specific course files and segment-level altitude validation.
Get your personalized strategy
The numbers above are samples. Sign up free and get the full Hardrock Hundred Endurance Run strategy from your VDOT, the current course model, Open-Meteo race-week forecast when available, and your nutrition preferences.
First race free · €7 per additional race · €19/yr for unlimited
Get my Hardrock Hundred Endurance Run strategyRelated races
- Badwater 135· Death Valley4450 m gain · typical 30–49 °CHardrock Hundred Endurance Run vs Badwater 135 — which is harder? →
- Black Canyon Ultras 100K· Mayer1500 m gain · typical 5–22 °CHardrock Hundred Endurance Run vs Black Canyon Ultras 100K — which is harder? →
- The Canyons Endurance Runs 100M· Auburn3311 m gain · typical 5–24 °CHardrock Hundred Endurance Run vs The Canyons Endurance Runs 100M — which is harder? →
- Javelina Jundred· Fountain Hills2400 m gain · typical 10–30 °CHardrock Hundred Endurance Run vs Javelina Jundred — which is harder? →
New to trail and ultra pacing? Start with our trail and ultra pacing guide or run the VDOT calculator.