Opinion polling for the 2020 Republican Party presidential primaries
This is a list of nationwide and statewide public opinion polls that have been conducted relating to the Republican primaries for the 2020 United States presidential election. The persons named in the polls are declared candidates or have received media speculation about their possible candidacy. The polls included are among Republicans or Republicans and Republican-leaning independents. If multiple versions of polls are provided, the version among likely voters is prioritized, then registered voters, then adults.
Background
National polling
From February 2020
From December 2019 to January 2020
June 2019 to November 2019
November 2018 to May 2019
Before November 2018
Against unnamed primary challenger
Statewide polling
The statewide polls are ordered by the scheduled date of the state's primary or caucus. Polls with a sample size of <100 have their 'sample size' cells marked in red to indicate a lack of reliability.Iowa caucus
The Iowa Republican caucus will take place on Monday, February 3, 2020.New Hampshire primary
The New Hampshire Republican primary will take place on Tuesday, February 11, 2020.Since July 2019
Before May 2019
;Against unnamed primary challenger| Poll source | Date administered | Sample size | Margin | Donald Trump | Other | Undecided |
| Apr 10–18, 2019 | 208 | ± 6.8% | 63% | 14% | 23% | |
| Feb 18–26, 2019 | 218 | ± 6.6% | 56% | 15% | 29% | |
| Aug 2–19, 2018 | 199 | ± 6.9% | 56% | 20% | 24% | |
| Apr 13–22, 2018 | 202 | ± 6.8% | 55% | 19% | 27% | |
| Jan 28 – Feb 10, 2018 | 157 | ± 7.8% | 60% | 18% | 23% | |
| Oct 3–15, 2017 | 191 | ± 7.1% | 47% | 23% | 30% |
Nevada caucus
The Nevada caucus was cancelled by the Nevada Republican Party in a vote on September 7, 2019.South Carolina primary
The South Carolina primary was cancelled in a vote by the South Carolina Republican Party on September 7, 2019.;Against unnamed primary challenger
| Poll source | Date administered | Sample size | Margin | Donald Trump | Other | Undecided |
| Jun 11–14, 2019 | 1,183 | ± 2.9% | 95% | 5% | – |
California primary
The California Republican primary will take place on Tuesday, March 3, 2020.;Since June 2019
;April 2019 to May 2019
;Against unnamed primary challenger
| Poll source | Date administered | Sample size | Margin | Donald Trump | Other | Undecided |
| May 25–28, 2019 | 989 | ± 3.1% | 94% | 7% | – | |
| Apr 6–9, 2019 | 853 | – | 88% | 12% | – |
Colorado primary
The Colorado Republican primary will take place on Tuesday, March 3, 2020.;Against unnamed primary challenger
| Poll source | Date administered | Sample size | Margin | Donald Trump | Other | Undecided |
| Jan 30–31 and Feb 4, 2019 | 622 | ± 3.9% | 78% | 17% | 5% |
Massachusetts primary
The Massachusetts Republican primary will take place on Tuesday, March 3, 2020.North Carolina primary
The North Carolina Republican primary will take place on Tuesday, March 3, 2020.Texas primary
The Texas Republican primary will take place on Tuesday, March 3, 2020.Vermont primary
The Vermont Republican primary will take place on Tuesday, March 3, 2020.| Poll source | Date administered | Sample size | Margin | Rocky De La Fuente | Donald Trump | Bill Weld | Other | Undecided |
| Feb 4-10, 2020 | 166 | ± 7.6% | 1% | 85% | 6% | 2% | 7% |
Wyoming caucuses
The last presidential cycle's Wyoming caucuses took place on March 1 in 2016 and would, if scheduled for Super Tuesday in 2020, take place on March 3, 2020. Instead, the Wyoming Republican state convention was scheduled for May 9, 2020.Michigan primary
The Michigan Republican primary took place on Tuesday, March 10, 2020.Illinois primary
The Illinois Republican primary took place on Tuesday, Marcch 17, 2020.| Poll source | Date administered | Sample size | Margin | Donald Trump | Bill Weld | Other | Undecided |
| Feb 10 - 17, 2020 | 232 | ± 6.4% | 89% | 4% | 2% | 5% |
Ohio primary
The Ohio Republican primary will take place on Tuesday, March 10, 2020.Florida primary
The Florida Republican primary will take place on Tuesday, March 17, 2020.;Against unnamed primary challenger
| Poll source | Date administered | Sample size | Margin | Donald Trump | Other | Undecided |
| May 25–31, 2018 | – | – | 68% | 18% | 13% |
Wisconsin primary
The Wisconsin Republican primary will take place on Tuesday, April 7, 2020.Arizona primary
The Arizona 2016 Republican primary was held on March 22, 2016, but the 2020 primary was cancelled on September 9, 2019.Delaware primary
The Delaware Republican primary will take place on Tuesday, April 28, 2020.| Poll source | Date administered | Sample size | Margin | John Kasich | Donald Trump | Undecided |
| Jul 24–29, 2018 | 288 | ± 5.8% | 9% | 67% | 25% |
Maryland primary
The Maryland Republican primary will take place on Tuesday, April 28, 2020.| Poll source | Date administered | Sample size | Margin | Larry Hogan | Donald Trump | Undecided |
| Apr 29 – May 4, 2019 | 203 | ± 7.0% | 24% | 68% | 8% |