In 1950s Milwaukee the Cunningham family must contend with Fonzie, a motorcycle riding Casanova.
| Episode 1 | Episode 2 | Episode 3 | Episode 4 | Episode 5 | Episode 6 | Episode 7 | Episode 8 | Episode 9 | Episode 10 | Episode 11 | Episode 12 | Episode 13 | Episode 14 | Episode 15 | Episode 16 | Episode 17 | Episode 18 |
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| Episode 20 |
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| Episode 21 |
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| Episode 22 |
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| Episode 23 |
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| Episode 24 |
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| Episode 25 |
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| Episode 26 |
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| Episode 27 |
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| Season 1 | 7.4 | 7.6 | 7.8 | 7.7 | 7.5 | 7.6 | 7.6 | 7.5 | 7.5 | 7.6 | 7.8 | 7.5 | 7.3 | 7.9 | 7.8 | 7.6 | |||||||||||
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| Season 2 | 7.5 | 7.8 | 7.8 | 7.3 | 6.7 | 8.2 | 7.9 | 7.8 | |||||||||||||||||||
| Season 3 | 7.8 | 8.0 | 7.8 | 7.8 | 7.9 | 8.3 | 7.7 | 7.4 | |||||||||||||||||||
| Season 4 | 7.3 | 6.9 | 7.0 | 7.9 | 7.5 | 7.9 | 8.0 | 8.2 | |||||||||||||||||||
| Season 5 | 6.7 | 6.9 | 6.6 | 7.9 | 6.7 | 7.5 | 7.1 | 7.3 | |||||||||||||||||||
| Season 6 | 6.5 | 6.1 | 6.4 | 7.3 | 6.6 | 7.2 | 6.8 | 7.0 | |||||||||||||||||||
| Season 7 | 6.3 | 5.2 | 7.0 | 7.1 | 7.0 | 6.7 | 6.9 | 6.8 | |||||||||||||||||||
| Season 8 | 6.5 | 6.1 | 6.2 | 6.4 | 6.7 | 6.6 | 6.4 | 6.5 | |||||||||||||||||||
| Season 9 | 6.6 | 6.6 | 6.5 | 6.4 | 6.9 | 6.4 | 7.0 | 6.8 | |||||||||||||||||||
| Season 10 | 6.8 | 6.5 | 6.8 | 6.6 | 6.9 | 6.2 | 7.1 | 6.4 | |||||||||||||||||||
| Season 11 | 6.1 | 6.3 | 6.7 | 7.6 | 7.6 | 5.9 | 6.8 | 6.4 |
| 7.7 |
| 7.5 |
| 8.7 |
| 7.8 |
| 7.7 |
| 8.0 |
| 7.5 |
| 7.5 |
| 7.7 |
| 8.0 |
| 7.5 |
| 8.0 |
| 7.1 |
| 7.8 |
| 7.3 |
| 7.6 |
| 8.3 |
| 7.8 |
| 7.8 |
| 8.0 |
| 7.2 |
| 8.2 |
| 7.1 |
| 7.6 |
| 7.4 |
| 7.5 |
| 7.5 |
| 7.5 |
| 7.2 |
| 7.8 |
| 7.5 |
| 7.5 |
| 7.9 |
| 7.1 |
| 7.5 |
| 7.7 |
| 7.3 |
| 8.0 |
| 7.5 |
| 6.5 |
| 7.4 |
| 7.6 |
| 8.1 |
| 7.9 |
| 7.3 |
| 7.0 |
| 7.3 |
| 6.8 |
| 7.3 |
| 7.6 |
| 7.0 |
| 7.1 |
| 7.1 |
| 6.8 |
| 7.2 |
| 7.4 |
| 7.2 |
| 8.0 |
| 6.4 |
| 5.8 |
| 7.2 |
| 8.5 |
| 6.5 |
| 6.5 |
| 6.9 |
| 7.0 |
| 7.3 |
| 6.3 |
| 7.1 |
| 6.9 |
| 6.8 |
| 7.1 |
| 6.5 |
| 7.1 |
| 7.5 |
| 7.2 |
| 7.1 |
| 7.0 |
| 6.6 |
| 7.3 |
| 7.4 |
| 7.8 |
| 7.3 |
| 7.6 |
| 6.8 |
| 7.5 |
| 7.6 |
| 7.1 |
| 7.4 |
| 6.5 |
| 6.7 |
| 7.0 |
| 7.0 |
| 6.6 |
| 7.8 |
| 7.3 |
| 6.8 |
| 7.2 |
| 7.3 |
| 7.1 |
| 7.1 |
| 6.3 |
| 6.9 |
| 6.3 |
| 6.4 |
| 6.2 |
| 6.4 |
| 6.7 |
| 6.9 |
| 6.2 |
| 6.3 |
| 7.1 |
| 6.2 |
| 6.6 |
| 6.7 |
| 6.8 |
| 5.3 |
| 6.2 |
| 6.4 |
| 6.4 |
| 6.4 |
| 6.7 |
| 7.0 |
| 6.1 |
| 6.2 |
| 7.2 |
| 6.5 |
| 6.1 |
| 6.2 |
| 6.7 |
| 6.6 |
| 6.9 |
| 6.4 |
| 6.3 |
| 7.1 |
| 6.6 |
| 6.4 |
| 6.1 |
| 6.3 |
| 6.4 |
| 6.1 |
| 6.4 |
| 6.0 |
| 6.5 |
| 6.1 |
| 6.1 |
| 6.6 |
| 6.8 |
| 6.2 |
| 6.0 |
| 7.1 |
| 6.4 |
| 7.2 |
| 7.8 |
| 6.3 |
| 5.9 |
| 6.3 |
| 6.0 |
| 7.0 |