Races›Marathon

Undergrad Spring 2026

Race-specific weather data and nutrition strategy for Undergrad Spring 2026 in Rexburg, ID, US.

RunningMarathon (26.2 mi)
LocationRexburg, ID, US
Last held
March 21, 2026Next edition TBA
Build Your Fueling PlanOfficial website
Race Location43.83°, -111.79°
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Race-Day Conditions

Low Heat Risk
Temperature
41°F

35–55°F range

Humidity
71%

65–83% range

5-year average via Open-Meteo. 80% of race days fall within the range shown. Updated Jun 8, 2026.

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Cold race conditions

Median race-day temperature is 41°F. Cold reduces perceived thirst but not fluid needs. Warm fluids are easier to consume. Carb targets remain the same — don't skip fueling because you're cold.

Sample Marathon Nutrition Plan

Based on a 155 lb runner finishing in ~4 hours. Your plan will differ based on body weight, experience, and conditions.

HourCarbsFluidSodiumExample
Hour 150g16oz400mg1 gel + sports drink
Hour 270g18oz500mg2 gels + water
Hour 370g18oz500mg1 gel + 4 chews
Hour 450g14oz400mg1 gel + sports drink
Total240g66oz1800mg

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

What to Expect at Undergrad Spring 2026

Undergrad Spring 2026 is a Marathon (26.2 mi) marathon held in Rexburg, ID, US. Based on 5 years of historical weather data, athletes can expect median race-day temperatures around 41°F.

Temperatures at Undergrad Spring 2026 typically range from 35°F to 55°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.

Marathon fueling is about precision. Current sports science supports 60–90g of carbohydrates per hour for events over 2.5 hours, with experienced athletes pushing up to 120g/hr using glucose-fructose combinations. Start conservative in the first hour (around 70% of target) and build to full intake by hour two.

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 Undergrad Spring 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.

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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 Marathon.
What is the typical race-day weather?
Based on 5 years of historical data, race-day temperatures at Rexburg, ID typically range from 35°F to 55°F (median 41°F). Humidity ranges from 65% to 83%.
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 Rexburg, ID 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 Marathon 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: Jun 8, 2026Confidence: 95%