2021 High School Football Computer ratings through three weeks based on win-loss, overall rating and strength of schedule. These are not humanly chosen.
| Rank | School | State | League | Division | W-L | League W-L | Division W-L | Rating | Schedule Strength | Opponents’ W-L |
| 1 | Windsor (CA) team preview trend | North Coast | North Bay – Oak | 3 | 3-0 | 0-0 | 1-0 | 28.5 | -3.4 | 5-7 |
| 2 | Cardinal Newman (Santa Rosa, CA) team preview trend | North Coast | North Bay – Oak | 4 | 3-1 | 0-0 | 0-0 | 21.6 | 12.5 | 7-8 |
| 3 | Rancho Cotate (Rohnert Park, CA) team preview trend | North Coast | North Bay – Oak | 2 | 2-1 | 0-0 | 0-0 | 10.6 | 6.8 | 8-4 |
| 4 | Vintage (Napa, CA) team preview trend | North Coast | Vine Valley | 1 | 1-2 | 0-0 | 0-0 | 7.0 | 4.5 | 6-4 |
| 5 | St. Vincent (Petaluma, CA) team preview trend | North Coast | North Bay – Redwood | 7 | 4-0 | 0-0 | 1-0 | 2.4 | -19.7 | 7-6 |
| 6 | Casa Grande (Petaluma, CA) team preview trend | North Coast | Vine Valley | 3 | 2-1 | 0-0 | 1-0 | 1.7 | -3.9 | 4-7 |
| 7 | Montgomery (Santa Rosa, CA) team preview trend | North Coast | North Bay – Redwood | 3 | 2-2 | 0-0 | 2-1 | 0.9 | 1.9 | 7-6 |
| 8 | Petaluma (CA) team preview trend | North Coast | Vine Valley | 4 | 4-0 | 0-0 | 2-0 | 0.2 | -30.5 | 3-10 |
| 9 | American Canyon (CA) team preview trend | North Coast | Vine Valley | 3 | 2-2 | 0-0 | 0-0 | -4.3 | -3.2 | 12-3 |
| 10 | St. Helena (CA) team preview trend | North Coast | North Central I | 7 | 2-1 | 0-0 | 1-1 | -4.5 | -15.7 | 7-5 |