Races›Ultra 50 Mile

64th Annual JFK 50 Mile presented by Altra

Race-specific weather data and nutrition strategy for 64th Annual JFK 50 Mile presented by Altra in Boonsboro, MD, US.

RunningUltra 50 MileRegistration Open
LocationBoonsboro, MD, US
Date
November 21, 2026
Register on RunSignUpBuild Your Fueling PlanOfficial website
Race Location38.05°, -87.27°
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Race-Day Conditions

Low Heat Risk
Temperature
55°F

44–62°F range

Humidity
66%

50–88% range

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

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Favorable temperature range

Typical race-day temperature of 55°F is in the optimal range for performance. Standard fueling and hydration targets apply.

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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 150g16oz400mg1 gel + sports drink
Hour 265g18oz500mg2 gels + water
Hour 365g18oz500mgChews + drink mix
Hour 460g18oz500mgGel + banana
Hour 555g16oz500mgRice ball + water
Hours 6–10250g80oz2500mgMix of gels, food, broth
Total545g166oz4900mg

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

What to Expect at 64th Annual JFK 50 Mile presented by Altra

64th Annual JFK 50 Mile presented by Altra is a Ultra 50 Mile ultra 50 mile held in Boonsboro, MD, US. Based on 5 years of historical weather data, athletes can expect median race-day temperatures around 55°F.

Temperatures at 64th Annual JFK 50 Mile presented by Altra typically range from 44°F to 62°F. Cold conditions suppress the sensation of thirst, but fluid and calorie needs remain largely unchanged. Warm fluids are easier to consume and absorb. Don't let the cool air fool you into skipping your fueling plan.

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.

Ready to fuel 64th Annual JFK 50 Mile presented by Altra?

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 50 Mile.
What is the typical race-day weather?
Based on 5 years of historical data, race-day temperatures at Boonsboro, MD typically range from 44°F to 62°F (median 55°F). Humidity ranges from 50% to 88%.
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 Boonsboro, MD 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%