Races›Ultra 50 Mile

Behind the Rocks Ultra

Race-specific weather data and nutrition strategy for Behind the Rocks Ultra in Moab, UT, US.

RunningUltra 50 Mile
LocationMoab, UT, US
Last held
March 28, 2026Next edition TBA
Build Your Fueling PlanOfficial website
Race Location38.57°, -109.55°
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Race-Day Conditions

Moderate Heat Risk
Temperature
60°F

50–79°F range

Humidity
36%

17–51% range

5-year average via Open-Meteo. 80% of race days fall within the range shown. Updated Mar 30, 2026.

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Moderate heat risk

Temperatures may reach 79°F. Plan for 10-15% higher sweat rates than cool conditions. Ensure adequate sodium intake (600-900 mg/hr) and consider pre-cooling strategies.

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Gut fatigue management

For races lasting 6+ hours, gut absorption efficiency decreases over time. Plan to reduce carb intake by 10-15% after hour 6 and shift toward easily digestible sources like gels and simple sugars.

Sample Ultra 50 Mile Nutrition Plan

Based on a 155 lb runner finishing in ~10 hours. Your plan will differ based on body weight, experience, and conditions.

HourCarbsFluidSodiumExample
Hour 150g18oz400mg1 gel + sports drink
Hour 265g20oz500mg2 gels + water
Hour 365g20oz500mgChews + drink mix
Hour 460g20oz500mgGel + banana
Hour 555g18oz500mgRice ball + water
Hours 6–10250g88oz2500mgMix of gels, food, broth
Total545g184oz4900mg

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

What to Expect at Behind the Rocks Ultra

Behind the Rocks Ultra is a Ultra 50 Mile ultra 50 mile held in Moab, UT, US. Based on 5 years of historical weather data, athletes can expect median race-day temperatures around 60°F.

Temperatures at Behind the Rocks Ultra typically range from 50°F to 79°F. The upper end of that range crosses into moderate heat risk. While not extreme, sweat rates will be elevated and athletes who under-fuel on sodium or fluids may feel it in the later miles. A dialed-in hydration plan makes a real difference here.

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.

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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.

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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 50 Mile.
What is the typical race-day weather?
Based on 5 years of historical data, race-day temperatures at Moab, UT typically range from 50°F to 79°F (median 60°F). Humidity ranges from 17% to 51%.
How much water should I drink?
Fluid needs vary based on your sweat rate, body weight, and race-day temperature. A typical range is 400-800 mL per hour, but hotter conditions at Moab, UT 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 50 Mile 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: runsignup_apiView sourceVerified: Mar 30, 2026Confidence: 95%