ER Episode Ratings Heatmap
1994 · 15 Seasons · 331 Episodes · Overall Score: 7.9/10 (331 rated)
Season 2 holds the highest collective average score across the series.
Season 2 Details →Lowest score variance (σ = 0.14), maintaining an average of 8.1.
Complete Episode Rating Matrix
Interactive score chart by season and episode number. Darker green indicates higher ratings; amber and red denote lower reception.
Ratings Analysis & Trajectory
Across 15 seasons and 331 episodes, ER has earned an overall series rating of 7.9 out of 10. The series displays remarkable consistency across its narrative arc, maintaining reliable ratings from premiere to conclusion.
The single highest-rated hour of television in the series is Season 2, Episode 7 ("Hell and High Water"), rated at an extraordinary 9.0/10 with 11 ratings. Conversely, the lowest-rated installment is Season 13, Episode 21 ("I Don't"), landing at 5.8/10.
The most precipitous single-episode shift occurred in Season 13 between Episode 20 ("Lights Out", 8) and Episode 21 ("I Don't", 5.8), a swing of 2.2 points.
Top 10 Highest Rated Episodes of ER
| Rank | Episode | Title | Score | Votes | Air Date |
|---|---|---|---|---|---|
| #1 | Season 2, Ep 7 | Hell and High Water | 9.0 | 11 | Nov 9, 1995 |
| #2 | Season 2, Ep 16 | The Healers | 8.8 | 13 | Feb 22, 1996 |
| #3 | Season 8, Ep 21 | On the Beach | 8.8 | 9 | May 9, 2002 |
| #4 | Season 10, Ep 8 | Freefall | 8.8 | 9 | Nov 20, 2003 |
| #5 | Season 1, Ep 10 | Blizzard | 8.7 | 15 | Dec 8, 1994 |
| #6 | Season 1, Ep 19 | Love's Labor Lost | 8.7 | 12 | Mar 9, 1995 |
| #7 | Season 4, Ep 15 | Exodus | 8.7 | 9 | Feb 26, 1998 |
| #8 | Season 6, Ep 14 | All in the Family | 8.6 | 16 | Feb 17, 2000 |
| #9 | Season 2, Ep 18 | A Shift in the Night | 8.6 | 11 | Apr 4, 1996 |
| #10 | Season 4, Ep 7 | Fathers and Sons | 8.6 | 10 | Nov 13, 1997 |