River Monsters Episode Ratings Heatmap
2009 · 9 Seasons · 59 Episodes · Overall Score: 7.4/10 (35 rated)
Season 3 holds the highest collective average score across the series.
Season 3 Details →Lowest score variance (σ = 0), maintaining an average of 8.0.
Complete Episode Rating Matrix
Interactive score chart by season and episode number. Darker green indicates higher ratings; amber and red denote lower reception.
| Episode | Season 1 | Season 2 | Season 3 | Season 4 | Season 5 | Season 6 | Season 7 | Season 8 | Season 9 |
|---|---|---|---|---|---|---|---|---|---|
| Ep 1 | 8.0 | 8.0 | – | 2.0 | – | 8.0 | 8.0 | 8.0 | – |
| Ep 2 | 8.0 | 8.7 | – | – | 6.0 | – | – | 8.0 | – |
| Ep 3 | 9.0 | 8.0 | – | 8.0 | – | – | – | 8.0 | – |
| Ep 4 | 1.0 | 6.8 | 8.0 | 7.0 | 8.0 | – | – | – | 7.0 |
| Ep 5 | 8.0 | 8.0 | 8.0 | – | 6.0 | 8.0 | 8.0 | – | 8.0 |
| Ep 6 | 8.0 | 7.0 | – | 8.0 | – | 8.0 | – | – | 8.0 |
| Ep 7 | – | 8.0 | 8.0 | 8.0 | – | – | – | – | – |
| Ep 8 | – | – | – | – | – | – | – | – | – |
| Season Avg | 7.0 | 7.8 | 8.0 | 6.6 | 6.7 | 8.0 | 8.0 | 8.0 | 7.7 |
Ratings Analysis & Trajectory
Across 9 seasons and 59 episodes, River Monsters has earned an overall series rating of 7.4 out of 10. The series demonstrates an upward quality trajectory, with later seasons sustaining higher viewer acclaim than its debut.
The single highest-rated hour of television in the series is Season 1, Episode 3 ("Alligator Gar"), rated at an extraordinary 9.0/10 with 3 ratings. Conversely, the lowest-rated installment is Season 1, Episode 4 ("European Maneater"), landing at 1.0/10.
The most precipitous single-episode shift occurred in Season 1 between Episode 3 ("Alligator Gar", 9) and Episode 4 ("European Maneater", 1), a swing of 8 points.
Top 10 Highest Rated Episodes of River Monsters
| Rank | Episode | Title | Score | Votes | Air Date |
|---|---|---|---|---|---|
| #1 | Season 1, Ep 3 | Alligator Gar | 9.0 | 3 | Apr 19, 2009 |
| #2 | Season 2, Ep 2 | Killer Snakehead | 8.7 | 3 | May 2, 2010 |
| #3 | Season 1, Ep 2 | Killer Catfish | 8.0 | 3 | Apr 12, 2009 |
| #4 | Season 1, Ep 1 | Piranha | 8.0 | 2 | Apr 5, 2009 |
| #5 | Season 2, Ep 1 | Death Ray | 8.0 | 2 | Apr 25, 2010 |
| #6 | Season 1, Ep 5 | Amazon Assassins | 8.0 | 1 | May 3, 2009 |
| #7 | Season 1, Ep 6 | Amazon Flesh Eaters | 8.0 | 1 | May 10, 2009 |
| #8 | Season 2, Ep 3 | Congo Killer | 8.0 | 1 | May 9, 2010 |
| #9 | Season 2, Ep 5 | Rift Valley Killer | 8.0 | 1 | May 23, 2010 |
| #10 | Season 2, Ep 7 | Demon Fish | 8.0 | 1 | May 31, 2010 |