Thunder in the Valley

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.