The Nielsen television ratings for last weekend’s Iowa Corn Indy 250 took a huge hit from a two-hour rain delay as the IZOD IndyCar Series event that didn’t end until after midnight in the Eastern time zone, drew a .18 rating, which translates to just approximately 254,000 households.

The race, seen on the NBC Sports Network, was preceded by tape-delayed coverage of Saturday’s qualifying heats and followed by live coverage of the rain-delayed Firestone Indy Lights event.

Last year’s Iowa race drew a .3 rating and 436,000 households, meaning that this year’s viewership plummeted more than 41 percent from a year ago.

NBC Sports Network is currently available in 80 million households, or about 30 percent fewer than standard networks.