Races›Ultra 100K

F.I.T. 'Rock Trail Race

Race-specific weather data and nutrition strategy for F.I.T. 'Rock Trail Race in Cumberland, RI, US.

RunningUltra 100K (62.1 mi)
LocationCumberland, RI, US
Last held
March 14, 2026Next edition TBA
Build Your Fueling PlanOfficial website
Race Location39.65°, -78.76°
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Race-Day Conditions

Low Heat Risk
Temperature
61°F

42–72°F range

Humidity
63%

48–78% 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 61°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 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 F.I.T. 'Rock Trail Race

F.I.T. 'Rock Trail Race is a Ultra 100K (62.1 mi) ultra 100k held in Cumberland, RI, US. Based on 5 years of historical weather data, athletes can expect median race-day temperatures around 61°F.

Temperatures at F.I.T. 'Rock Trail Race typically range from 42°F to 72°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.

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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.
What is the typical race-day weather?
Based on 5 years of historical data, race-day temperatures at Cumberland, RI typically range from 42°F to 72°F (median 61°F). Humidity ranges from 48% to 78%.
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 Cumberland, RI 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: runsignup_apiView sourceVerified: Mar 30, 2026Confidence: 95%