A month of NFL football is in the books, and the San Francisco 49ers have already flipped the script on just about everything we thought we knew back in August. Through four games of the 2026 campaign, the storylines coming out of Santa Clara look nothing like the preseason projections. That's exactly what makes this team so fascinating to track. From a revamped offensive identity to a defense exceeding even the most optimistic expectations, here's our breakdown of the 4 biggest surprises about the 49ers a month into the season.
1. The Offense Has a Brand-New Identity
Everyone assumed the 49ers would lean on the same run-first, play-action-heavy blueprint that's defined the Kyle Shanahan era. The first month has shown something else entirely: a noticeably more aggressive, vertical passing approach. Brock Purdy is pushing the ball downfield at a rate we simply haven't seen before, and the results have been explosive. Those downfield shots are opening up everything underneath, and opposing secondaries are struggling to adjust.
What makes this shift so jarring is how quickly it happened. There was no gradual transition. The 49ers came out in Week 1 slinging it, and they haven't looked back. Tight ends are being used more as vertical threats than as blockers, and the receiving corps is stretching defenses in ways that create chunk plays on a weekly basis. If this trend holds, San Francisco suddenly has one of the most unpredictable offenses in football.
📊 The 49ers rank near the top of the league in explosive pass plays through four games - a dramatic jump from their preseason projections as a ground-and-pound unit.
That unpredictability is a nightmare for defensive coordinators. You can't stack the box anymore. You can't sit back in soft coverage without getting carved up. The chess match has tilted in San Francisco's favor.
2. The Defense Is Playing Way Above Its Preseason Grade
Coming into the season, most analysts pegged this defense as the question mark - a unit that lost key contributors and would need time to gel. A month in, that narrative is dead. The front seven is generating consistent pressure without blitzing, and the secondary has been sticky in coverage in ways that have erased some of the league's better passing attacks.
The run defense deserves a special shoutout. Teams have tried to establish the ground game against the 49ers and simply haven't been able to. That combination - stuffing the run without extra help and still getting home with four rushers - is the formula that wins in January.
Table: 49ers Defensive Snapshot Through Four Games
| Metric | 2026 First Month | Preseason Expectation |
|---|---|---|
| Points allowed per game | Among NFL's stingiest units | Middle of the pack |
| Pass rush (sacks) | Consistent, four-man pressure | Needed blitz help |
| Run defense | Elite early-down stops | Concern area |
The eye test matches the numbers. This group is flying around, communicating well, and playing with a swagger that suggests the preseason skepticism was badly misplaced.
3. The Injury Bug Has Barely Bitten
For a franchise that's been defined by brutal injury luck in recent memory, the relative health through four games is a genuine shock. The 49ers have avoided the catastrophic early-season injuries that derailed past campaigns, and the depth pieces have stepped up whenever called upon. That's a testament to both the training staff and the roster construction.
📊 San Francisco has yet to lose a projected starter to a season-ending injury - a stark departure from the early-season carnage of recent years.
It's not that nobody's banged up - it's October, everybody's banged up. But the 49ers have managed workloads smartly, rotated their defensive front, and kept their key playmakers on the field. If that good fortune continues, it changes the entire calculus of their season.
