| Poll source | Date(s) administered | Sample size | Margin of error | Xavier Becerra (D) | Chad Bianco (R) | Steve Hilton (R) | Matt Mahan (D) | Katie Porter (D) | Tom Steyer (D) | Eric Swalwell (D) | Tony Thurmond (D) |
| Public Policy Polling (D) | May 27–28, 2026 | 686 (LV) | ± 3 % | 18% | 14% | 20% | 7% | 7% | 21% | — | — |
| David Binder Research (D) | May 26–27, 2026 | — | ± 4 % | 26% | 9% | 27% | 4% | 8% | 22% | — | — |
| Kreate Strategies | May 23–27, 2026 | 900 (LV) | ± 3 % | 27% | 9% | 26% | 4% | 5% | 20% | — | — |
| Berkeley IGS | May 19–24, 2026 | 5,472 (LV) | ± 2 % | 25% | 11% | 21% | 4% | 7% | 19% | — | 1% |
| Global Strategy Group (D) | May 18–21, 2026 | 800 (LV) | — | 19% | 12% | 22% | 8% | 8% | 19% | — | 1% |
| Echelon Insights (R) | May 18–21, 2026 | 800 (LV) | — | 15% | 12% | 25% | 7% | 7% | 18% | — | — |
| PPIC | May 14–18, 2026 | 986 (LV) | ± 4 % | 23% | 13% | 20% | 7% | 12% | 15% | — | 1% |
| Evitarus (D) | May 14–16, 2026 | 1,200 (LV) | ± 2 % | 21% | 10% | 22% | 4% | 7% | 15% | <1% | 1% |
| David Binder Research (D) | May 5–11, 2026 | — | ± 3 % | 22% | 13% | 23% | 7% | 12% | 15% | — | <1% |
| Emerson College | May 9–10, 2026 | 1,000 (LV) | ± 3 % | 20% | 12% | 18% | 9% | 13% | 19% | — | 1% |
| 19% | 11% | 17% | 8% | 10% | 17% | — | 1% | 4% | — | 1% | 12% |
| Kreate Strategies | May 5–9, 2026 | 900 (LV) | ± 3 % | 20% | 13% | 22% | 9% | 9% | 14% | — | — |
| Mellman Group (D) | May 3–6, 2026 | 600 (LV) | ± 4 % | 20% | 14% | 20% | 10% | <10% | 12% | — | <10% |
| Impact Research (D) | April 28 – May 3, 2026 | 900 (LV) | ± 3 % | 23% | 11% | 23% | 10% | 9% | 14% | — | 1% |
| Evitarus (D) | April 30 – May 2, 2026 | 1,200 (LV) | ± 2 % | 18% | 14% | 18% | 7% | 8% | 12% | 1% | 1% |
| SurveyUSA | April 28 – May 1, 2026 | 991 (LV) | ± 4 % | 10% | 12% | 20% | 7% | 8% | 18% | — | 2% |
| Gudelunas Strategies | April 23–27, 2026 | 800 (LV) | ± 3 % | 24% | 13% | 23% | 6% | 10% | 15% | <1% | 1% |
| CBS News/YouGov | April 23–27, 2026 | 1,479 (LV) | ± 4 % | 13% | 10% | 16% | 4% | 9% | 15% | — | 1% |
| EMC Research (D) | April 21–26, 2026 | 1,000 (LV) | ± 3 % | 21% | 14% | 20% | 8% | 8% | 17% | — | 2% |
| | April 20, 2026 | Yee withdraws from the race, endorses Steyer |
| Independent Voter Project | April 14–20, 2026 | 3,404 (LV) | ± 2 % | 23% | 17% | 20% | 4% | 11% | 14% | — | 1% |
| Gudelunas Strategies | April 14–18, 2026 | 800 (LV) | ± 3 % | 15% | 14% | 20% | 6% | 13% | 15% | <1% | 2% |
| Kreate Strategies | April 12–18, 2026 | 900 (LV) | ± 3 % | 10% | 14% | 18% | 4% | 10% | 16% | — | — |
| Evitarus (D) | April 15–17, 2026 | 1,200 (LV) | ± 2 % | 13% | 14% | 16% | 5% | 10% | 13% | 1% | 1% |
| Emerson College | April 14–15, 2026 | 1,000 (LV) | ± 3 % | 10% | 14% | 17% | 5% | 10% | 14% | — | 1% |
| | April 12, 2026 | Swalwell withdraws from the race |
| Impact Research (D) | April 8–12, 2026 | 900 (LV) | ± 3 % | 7% | 10% | 25% | 8% | 14% | 16% | — | — |
| SurveyUSA | April 8–10, 2026 | 788 (LV) | ± 5 % | 4% | 8% | 18% | 4% | 8% | 21% | 9% | 1% |
| David Binder Research (D) | April 1–6, 2026 | 800 (LV) | ± 3 % | 4% | 13% | 22% | 5% | 11% | 12% | 18% | 2% |
| Evitarus (D) | March 31 – April 5, 2026 | 1,200 (LV) | ± 2 % | 4% | 14% | 14% | 4% | 7% | 11% | 12% | <1% |
| PPIC | March 26 – April 3, 2026 | 1,008 (LV) | ± 3 % | 5% | 14% | 17% | 5% | 10% | 14% | 18% | 2% |
| Kreate Strategies | March 23–29, 2026 | 700 (LV) | ± 3 % | 2% | 10% | 19% | 4% | 8% | 13% | 13% | — |
| Echelon Insights (R) | March 12–17, 2026 | 600 (LV) | ± 4 % | 3% | 14% | 20% | 4% | 10% | 13% | 15% | 1% |
| Evitarus (D) | March 12–17, 2026 | 2,000 (LV) | ± 2 % | 3% | 14% | 16% | 3% | 10% | 10% | 10% | 1% |
| Berkeley IGS | March 9–14, 2026 | 3,889 (LV) | ± 2 % | 5% | 16% | 17% | 4% | 13% | 10% | 13% | 1% |
| Emerson College | March 7–9, 2026 | 1,000 (LV) | ± 3 % | 3% | 11% | 13% | 3% | 8% | 11% | 17% | 1% |
| Politico/UC Berkeley/ TrueDot | February 25 – March 3, 2026 | 1,004 (LV) | ± 3 % | 5% | 11% | 19% | 3% | 11% | 13% | 11% | 1% |
| Global Strategy Group (D) | February 27 – March 2, 2026 | 1,340 (LV) | ± 3 % | 5% | 15% | 20% | 3% | 13% | 16% | 11% | — |
| Independent Voter Project | February 13–20, 2026 | 868 (LV) | ± 3 % | 3% | 23% | 15% | 2% | 12% | 8% | 18% | 1% |
| Emerson College | February 13–14, 2026 | 1,000 (LV) | ± 3 % | 4% | 14% | 17% | 3% | 10% | 9% | 14% | 2% |
| PPIC | February 3–11, 2026 | 1,049 (LV) | ± 3 % | 5% | 12% | 14% | 3% | 13% | 10% | 11% | 2% |
| Tavern Research (D) | February 2–5, 2026 | 1,097 (LV) | ± 3 % | 6% | 20% | 12% | 2% | 9% | 9% | 10% | — |
| EMC Research (D) | January 29 – February 4, 2026 | 1,400 (V) | — | 6% | 21% | 17% | 5% | 12% | 9% | 18% | 1% |
| Global Strategy Group (D) | January 29 – February 3, 2026 | — (LV) | — | 4% | 18% | 18% | 3% | 12% | 10% | 11% | — |
| J Wallin Opinion Research | January 29 – February 1, 2026 | 1,000 (RV) | — | 6% | 11% | 14% | 4% | 8% | 12% | 9% | 3% |
| RBI Strategies & Research (D) | January 25–29, 2026 | — (LV) | — | 4% | 15% | 16% | 3% | 13% | 8% | 14% | 2% |
| Tulchin Research (D) | January 22–28, 2026 | 1,000 (LV) | ± 3 % | 5% | 15% | 15% | — | 13% | 10% | 14% | 1% |
| Public Policy Polling (D) | January 20–21, 2026 | 1,001 (V) | — | 6% | 18% | 17% | 5% | 14% | 8% | 12% | 1% |
| David Binder Research (D) | January 17–20, 2026 | 800 (LV) | ± 3 % | 5% | 17% | 14% | — | 11% | 8% | 11% | 2% |
