Race fans remember to tune in to the Performance Racing Network radio broadcasts of the Nationwide Series and Sprint Cup throughout the NASCAR season. Guess the Green Flag Temperature before it is announced for your chance to win an Exergen TemporalScanner Thermometer.

For official contest rules and details visit: http://www.goprn.com/contests/greenflagtemp/

Below are a few clips from Indy events earlier this NASCAR season: