Races›Ultra 100K

Black Canyon Ultras

Black Canyon Ultras is in Spring Valley / New River. Build your free hour-by-hour plan.

RunningUltra 100K (62.1 mi)Registration Open
LocationSpring Valley / New River, Arizona, US
Date
Usually February
Build Your Fueling PlanOfficial website
Race Location34.40°, -112.24°
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Race-Day Weather

Historical weather data is being collected for this race. In the meantime, use the calculator to enter conditions manually — it will auto-fetch weather for your race date and location.

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Weather data unavailable

Historical weather data is not yet available for this race. Use the calculator with manual temperature and humidity inputs for the most accurate plan.

Sample Ultra 100K Nutrition Plan

Based on a 155 lb runner finishing in ~14 hours. Your plan will differ based on body weight, experience, and conditions.

HourCarbsFluidSodiumExample
Hours 1–3180g52oz1400mgGels + sports drink
Hours 4–7240g68oz2000mgMix of gels, chews, real food
Hours 8–10150g48oz1500mgBroth, PB sandwich, gels
Hours 11–14180g56oz1600mgWhatever stays down + cola
Total750g224oz6500mg

These are general estimates. Get your personalized plan for this race →

What to Expect at Black Canyon Ultras

Black Canyon Ultras is a 100K ultra held in Spring Valley / New River, Arizona, US.

Ultra-distance racing demands a flexible nutrition strategy. Gut absorption efficiency declines over many hours, so plan for variety — alternating between gels, chews, real food, and liquids helps prevent flavor fatigue and GI rebellion. Many ultra runners find that what works at hour 3 is intolerable by hour 10. Build your plan with options, not rigid prescriptions.

We do our best to keep race details accurate and up to date, but things can change and occasionally we simply get something wrong.

Always check the official website for the most complete and current information.

See something wrong? Let us know and we'll fix it.

Fueling and hydration suggestions are based on published sports science research including ACSM position stands, ISSN guidelines, and peer-reviewed work by Jeukendrup, Sawka, and others. This is not medical or dietary advice — individual needs vary. Always test your nutrition strategy in training before race day.

Ready to fuel Black Canyon Ultras?

Get a personalized, hour-by-hour fueling blueprint based on your body, this race's course, and historical weather data. Free, no account needed.

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Frequently Asked Questions

What should I eat during the race?
Your nutrition plan depends on your body weight, experience level, and race-day conditions. Use our free calculator to get a personalized, hour-by-hour fueling plan with specific carb, fluid, and sodium targets for this Ultra 100K.
How much water should I drink?
Fluid needs vary based on your sweat rate, body weight, and race-day temperature. A typical range for moderate days is about 500-800 ml/hr, but hotter conditions at Spring Valley / New River, Arizona may require more. Our calculator provides personalized fluid targets adjusted for the expected weather.
How many calories do I need?
Rather than replacing all calories burned, focus on carbohydrate intake — the primary fuel for endurance performance. Target 30-50% of caloric expenditure through carbs. Our calculator computes the exact hourly targets based on your Ultra 100K pace and body weight.
When should I start fueling?
Begin fueling within the first 30-45 minutes. Start at about 70% of your target intake and ramp up to full by hour 2. This gives your gut time to adjust. Starting too late makes it nearly impossible to catch up on carbs and fluids.
Source: curatedView sourceVerified: Nov 4, 2026Confidence: 80%