# Opinion polling for the 2018 Costa Rican general election

This is opinion polling for the Costa Rican general election in 2018.
| Date | Source | Alvarado PAC | Alvarado PREN | Desanti PLN | Araya FA | Castro PIN | Campos PRC | Guevara ML | Hernández PRSC | López PASE | Mena PNG | Piza PUSC | Redondo ADC | Vega PT | None | N/A | Lead |
| 19–27 April 2017 | Cid Gallup | 2% | - | 29% | - | 24% | - | 8% | 4% | - | - | 11% | - | - | - | 22% | 5% |
| 25–27 May 2017 | Opol | 0.76% | 3.31% | 34.95% | 2.55% | 18.36% | - | 6.63% | 6.88% | - | 0.51% | 1.27% | - | - | 27.5% | 16.3% | 16% |
| 22–24 June 2017 | Opol | 4.90% | 3.99% | 29.5% | 1.75% | 19.19% | - | 3.92% | 9.45% | - | 0.56% | 20.65% | 0.84% | | 25.7% | 22.2% | 9% |
| 25 - 27 July 2017 | Opol | 10.79% | 5.83% | 31.22% | 2.25% | 14.48% | - | 6.82% | 9.63% | - | 0.44% | 17.56% | 0.33% | - | - | - | 14% |
| 17 - 26 July 2017 | CIEP | 8% | - | 25.2% | 0.4% | 5.8% | - | - | 1.1% | - | 0.3% | 11.5% | - | - | - | 42% | 14% |
| 29 - 31 August 2017 | Opol | 6% | - | 36,76% | 1,86% | 20,31% | - | 8,44% | 6,44% | - | - | 12,59% | 9% | - | - | - | 16% |
| 27 August - 2 September 2017 | Enfoques | 2% | - | 23,7% | - | 11,4% | - | 7,8% | 2,9% | - | - | 10,5% | - | - | 14,6% | 22,4% | 12% |
| 4 - 11 September 2017 | CID Gallup | 20% | - | 49% | 13% | 51% | - | 34% | 19% | - | 7% | 40% | - | - | - | - | 2% |
| 5–13 September 2017 | CID Gallup | 6% | - | 23% | 1% | 16% | - | 8% | 2% | - | - | 13% | - | - | | 30% | 7% |
| 25 - 28 September 2017 | Opol | 7.17% | 5.7% | 31.54% | 1.49% | 18.94% | - | 7.40% | 8.6% | - | 1.07% | 17.86% | 0.42% | - | - | - | 13% |
| 3 - 11 October 2017 | CIEP | 6.3% | - | 19.6% | 1.7% | 12.6% | - | 3.4% | 1.9% | - | - | 11% | - | - | - | 40.3% | 7% |
| 27 - 29 October 2017 | Opol | 6.65% | 5.01% | 31.33% | 2.64% | 23.77% | 2.9% | 4.28% | 9.38% | 0.36% | 0.73% | 12.93% | 0.55% | 0.27% | 28.43% | 21.61% | 8% |
| 13 - 15 November 2017 | Opol | 7.5% | 7.1% | 30% | 3% | 24.5% | 1.9% | 2.3% | 9.6% | 0.5% | 0.6% | 11.9% | 0.5% | 0.6% | 18.8% | 31% | 6% |
| 4 - 16 November 2017 | CIEP | 4% | 2% | 15% | 2% | 15% | - | 3% | 5% | - | - | 11% | - | - | - | 37% | Tied |
| 19 - 24 November 2017 | CID Gallup | 4% | 4% | 15% | 1% | 17% | 2% | 3% | 7% | - | - | 9% | - | - | - | 33% | 2% |
| 28 - 29 November 2017 | Opol | 7.9% | 3.9% | 29.5% | 3.1% | 29.1% | 1.1% | 1.7% | 8.5% | 1% | 0.5% | 12.5% | 0.4% | 0.7% | 24% | 31% | Tied |
| 20 - 30 November 2017 | Idespo | 5.8% | 2.6% | 12.5% | 2.2% | 16.4% | - | 0.7% | 4.7% | - | 0.4% | 11.5% | 1.1% | - | 2.6% | 39.1% | 4% |
| December 2017 | CIEP | 5% | 3% | 14% | 1.5% | 18% | - | 0.5% | 8% | - | - | 13% | - | - | - | 42% | 4% |
| December 2017 | Opol | 4.4% | 5.5% | 28.7% | 1.7% | 27% | 1% | 3.5% | 9.9% | 0.5% | 0.3% | 16.7% | 0.5% | 0.3% | - | - | 1% |
| 2 - 4 January 2018 | Opol | 4.7% | 5.5% | 27.4% | 1.9% | 28.8% | 1.1% | 2.9% | 11.1% | 0.7% | 0.4% | 12.5% | 1.3% | 0.6% | - | - | 1% |
| 9 - 11 January 2018 | Opol | 5.7% | 8.3% | 26.2% | 1.8% | 25.3% | 1.1% | 1.4% | 11.1% | 0.7% | 1.0% | 15.3% | 1.4% | 0.7% | - | - | 1% |
| 9 - 14 January 2018 | CID-Gallup | 5.3% | 9.6% | 15.5% | 1.6% | 16.5% | 1.7% | 3.4% | 7.7% | | 2.8% | 12.2% | | | | - | 1% |
| 12 - 17 January 2018 | Demoscopia | 4% | 3.5% | 16.7% | 1% | 12.4% | - | 4% | 9.1% | - | 1.2% | 14.7% | - | - | 11.9% | 35% | 2% |
| 15 - 18 January 2018 | Opol | 5.6% | 18.4% | 22% | 1.9% | 20.7% | 1.3% | 2.5% | 9.5% | 0.8% | 1.3% | 14.17% | 1% | 0.4% | - | - | 2% |
| 15 - 17 January 2018 | CIEP | 6% | 17% | 11% | - | 16% | - | - | 6% | - | - | 9% | - | - | - | - | 1% |
| 15 - 20 January 2018 | CID Gallup | 6% | 14% | 3% | 16% | 12% | - | 3% | 7% | - | 4% | 12% | - | 2% | 3% | 20% | 2% |
| 22 - 24 January 2018 | Opol | 8% | 22.5% | 21.9% | 1.6% | 17.4% | 0.7% | 1.6% | 9.5% | 0.8% | 0.9% | 13.1% | 1.3% | 0.4% | - | - | 1% |
| 22 - 24 January 2018 | Demoscopía | 8.3% | 10.7% | 12.7% | 0.2% | 7.3% | - | 1% | 4% | - | 0.3% | 12% | 0.5% | - | - | - | Tied |
| 24 - 26 January 2018 | CIEP | 10.6% | 16.9% | 12.4% | - | 8.6% | - | - | 2.8% | - | - | 8.2% | - | - | 1% | 36.5% | 4% |
| 31 January 2018 | Opol | 12.0% | 17.4% | 13.8% | 1.1% | 8.5% | 0.6% | 0.8% | 3.8% | 0.2% | 0.5% | 8.3% | 0.7% | 0.3% | 14.1% | 19.1% | 4% |
| 4 February 2018 | First round | First round | First round | First round | First round | First round | First round | First round | First round | First round | First round | First round | First round | First round | First round | First round | First round |
| 8-9 February 2018 | Opol | 28.0% | 37.6% | | | | | | | | | | | | 23.2% | 11.3% | 9% |
| 6-8 February 2018 | CIEP | 42% | 45% | | | | | | | | | | | | - | 13% | 3% |
| 15-16 February 2018 | Opol | 29.4% | 36.1% | | | | | | | | | | | | 19.7% | 14.7% | 6.7% |
| 21-23 February 2018 | Opol | 29.2% | 39.2% | | | | | | | | | | | | 15.4% | 16.3% | 10% |
| 6–17 February 2018 | Idespo | 52% | 29% | | | | | | | | | | | | | | 23% |
| 28 February - 2 March | Opol | 31.1% | 39.7% | | | | | | | | | | | | 14% | 15.2% | 8.6% |
| 27-28 February 2018 | CIEP | 41% | 39% | | | | | | | | | | | | | 20% | 3% |
| 8-9 March 2018 | Opol | 31.4% | 38.7% | | | | | | | | | | | | 15.1% | 14.8% | 7.3% |
| 10-15 March 2018 | CID Gallup | 28.4% | 32.9% | | | | | | | | | | | | 38% | 38% | 4.5% |
| 12-16 March 2018 | Opol | 27.7% | 36.5% | | | | | | | | | | | | 22.2% | 13.6% | 8.8% |
| 19-21 March 2018 | CIEP | 42% | 43% | | | | | | | | | | | | | 15% | 1% |
| 19-23 March 2018 | Opol | 28.5% | 36.2% | | | | | | | | | | | | 20.9% | 14.4% | 7.7% |