Races›Ultra 100 Mile

Tunnel Hill 100 2026

Tunnel Hill 100 2026 is Nov 14, 2026 in Vienna. Plan for cold air, then build your free hour-by-hour plan.

RunningUltra 100 MileRegistration Open
LocationVienna, Illinois, United States
Date
November 14, 2026
Build Your Fueling PlanOfficial website
Race Location37.42°, -88.89°
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Race-Day Conditions

Live ForecastLow Heat Risk
Temperature
30°F

forecast

Humidity
73%

forecast

Live forecast via Open-Meteo. Updated daily. Historical avg: 41–70°F, 53–84% humidity.

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Favorable temperature range

Typical race-day temperature of 60°F is in the optimal range for performance. Standard fueling and hydration targets apply.

Sample Ultra 100 Mile Nutrition Plan

Based on a 155 lb runner finishing in ~24 hours. Your plan will differ based on body weight, experience, and conditions.

HourCarbsFluidSodiumExample
Hours 1–6360g100oz3000mgGels, chews, drink mix
Hours 7–12300g96oz3000mgReal food rotation + gels
Hours 13–18240g84oz2400mgBroth, potatoes, cola, gels
Hours 19–24200g72oz2000mgWhatever works + caffeine
Total1100g352oz10400mg

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

What to Expect at Tunnel Hill 100 2026

Tunnel Hill 100 2026 is a 100-mile ultra held in Vienna, Illinois, United States. Based on 5 years of historical weather data, athletes can expect median race-day temperatures around 60°F.

Temperatures at Tunnel Hill 100 2026 typically range from 41°F to 70°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.

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 Tunnel Hill 100 2026?

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

Build Your Plan

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 100 Mile.
What is the typical race-day weather?
Based on 5 years of historical data, race-day temperatures at Vienna, Illinois typically range from 41°F to 70°F (median 60°F). Humidity ranges from 53% to 84%.
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 Vienna, Illinois 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 100 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: curatedView sourceVerified: Nov 4, 2026Confidence: 80%