Name: Thunder in the Valley
Start: 2026-05-09
End: 2026-05-09
Location: Terre Haute, Indiana

About the Event

USAT CERTIFIED EVENT

USAT membership will be required at registration or you can opt for a 1Day USAT race license.

Thunder in the Valley Triathlon is 40 years old in 2025. Athletes will also get top notch swag with custom die cast 40th anniversary finisher medals and awards, custom race bibs, swim caps, and a retro participant t-shirt.

Sprint Triathlon Distances 500Μ SWIM 20K BIKE 5K RUN

Duathlon Distances 1.6K RUN 20K BIKE 5K RUN

This triathlon will begin at 8am with a 500 meter swim in the calm Hawthorne Lake. After a quick lakeside transition athletes will head out for a smooth, fast 20k bike course with rolling hills that brings them back to the transition area. Athletes will then run on a shaded, flat out and back 5k course before returning to the finish line. This race is the perfect race for the new triathlete looking for their first triathlon, or the seasoned athlete looking for their first race of the season. For 40 years, Thunder has been the race for first time triathletes!

The Duathlon will begin with a 1 mile out and back run to transition before heading out on the 20k bike course. This race is held around and within beautiful Hawthorne Park with great competition for beginners and experienced athletes. Awards and post race refreshments following the race.

The guarantee t-shirt cutoff is May 1st at 11:59pm. If you sign up after this date, there is not a guarantee you will get a shirt, even though we will order some extras.

USAT rules state that competitors may wear wetsuits if the water temperature is 78 degrees or lower.
USAT rules also state that if the water temperature is between 78.1 – 83.9 degrees, competitors may wear wetsuits but will not be eligible for awards or USAT ranking points.
USAT rules also state that if the water temperature is 84 degrees or higher, wetsuits may not be worn.

Races Offered

Sprint Triathlon

May 09, 2026

straighten

Distance — 15 Miles

terrain

Type — —

timer

08:00

sell

$65.00

Triathlon Relay Team

May 09, 2026

straighten

Distance — 15 Miles

terrain

Type — —

timer

08:00

sell

$100.00

Relay Duathlon Team

May 09, 2026

straighten

Distance — 15 Miles

terrain

Type — —

timer

08:05

sell

$90.00

Duathlon

May 09, 2026

straighten

Distance — 15 Miles

terrain

Type — —

timer

08:10

sell

$65.00

Weather Overview

These values represent the 3-year monthly averages for May in Terre Haute.

Temp (°C)

Feels Like (°C)

thermostat 13.9° / 25.1°

wb_sunny 12.3° / 24.1°

Wind (km/h)

Humidity (%)

air 11.5 /

water_drop 67.6%

Temp (°C)

Feels Like (°C)

Wind (km/h)

Humidity (%)

thermostat 13.9° / 25.1°

wb_sunny 12.3° / 24.1°

air 11.5 km/h

water_drop 67.6%

About Terre Haute

Terre Haute is a city of 61,000 people (2019) in west-central Indiana, about 180 mi (300 km) south of Chicago and 1 hour southwest of Indianapolis. Terre Haute is one of the largest cities in the Wabash Valley and is known as the "Queen City of the Wabash". The city is home to several higher education institutions, including Indiana State University, Rose-Hulman Institute of Technology, and Ivy Tech Community College of Indiana.