NASCAR’s secondary series is facing a huge brand change, leaving the title name “Xfinity Series” to become the brand-new O’Reilly Auto Parts Series. What is not changing, however, is its broadcast partner. The CW is headed for its 2nd season with the series, and has been investing heavily in it. Year after year, we put up the rating numbers and rank them accordingly in comparison to the previous season. Here’s how it works:
- We will directly compare each race’s viewership from 2025 to that race’s (or closest comparable race’s) 2026 viewership. We will also keep a tally of how each race weekend fared compared to the same weekend last season.
- This can be confusing, as the “2026 Season as a Whole” section compares races not directly to themselves, but to their corresponding 2025 race weekends. For example, in that section, the 3rd race of the year is compared to 2025’s 3rd race of the season, regardless of the race track.
- If necessary, we will also address any potential dips in ratings, such as weather delays, postponements, or debuting races, like San Diego taking over for the Mexico City race
The 2026 O’Reilly Series Season as a Whole
All Races (1 Total in 2026)
- 2026 Total/Average Viewership to Date: (Available Data From 1 race)*: 1.812 Million/1.812 Million Per Race
- 2025 Total/Average Viewership to Date (Available Data From 33 Races): 1.825 Million/1.825 Million Per Race
- Total Viewership Difference (2026 vs 2025): –0.013 Million (-0.717%)
- Average Viewership Difference (2026 vs 2025): -0.013 Million (-0.717%)
2026 United Rentals 300 at Daytona via Adam Stern
.@TheCW got 1.812 million viewers for Saturday's NASCAR O'Reilly Auto Parts Series race at Daytona, flat from last year, per Nielsen's panel and big data figures.
— Adam Stern (@A_S12) February 18, 2026
➡️ The race drew 340,000 viewers in the adults 18-49 demographic, the best for an event in that series since 2018. pic.twitter.com/JbyV4L0s0I
- 2026 Viewership: 1.812 Million Viewers
- 2025 Viewership: 1.825 Million Viewers
- Viewership Comparison (2024 vs 2025): –0.013 Million (-0.717%)
