| Timeslot | Lo | Avg | Hi | y2y | A18-49+ | Label | Results |
| Monday 10:00 | 1.7 | 2.04 | 2.3 | -12% | 97 | marginal | detail |
Rating the Ratings: Castle's usual lead-in, Dancing with the Stars, had a rather disastrous season. And early on, it looked like Castle might join it; the show's 2.1 premiere was down about a third year-to-year. But Castle held up very well post-premiere and closed the vast majority of that year-to-year deficit over the course of the season. By season's end, it was actually beating competing procedural Hawaii Five-0 with some consistency, and it also tied or beat the DWTS rating on a few occasions. Though the drop was still in the double digits, this was arguably one of Castle's most valuable seasons, as it really proved itself a decent player even with DWTS diminished. Grade: B.
Here's the now updated War of 18-49 post for Castle.
