| Poll | Date | Trump | Cruz | Rubio | Carson | Paul | Bush | Huckabee | Kasich | Fiorina | Christie | Santorum | Spread |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| RCP Average | 1/24 - 1/31 | 28.6 | 23.9 | 16.9 | 7.7 | 4.1 | 4.1 | 3.1 | 2.9 | 2.6 | 2.4 | 1.1 | Trump +4.7 |
2016 Iowa Results: 1st - Cruz 27.6 | 2nd - Trump 24.3 | 3rd - Rubio 23.1 | 4th - Carson 9.3 | 5th - Paul 4.5
| Poll | Date | Romney | Paul | Santorum | Gingrich | Perry | Bachmann | Huntsman | Cain | Spread |
|---|---|---|---|---|---|---|---|---|---|---|
| RCP Average | 12/21 - 1/1 | 22.8 | 21.5 | 16.3 | 13.7 | 11.5 | 6.8 | 2.3 | Romney +1.3 |
2012 Iowa Results: 1st - Santorum 24.6 | 2nd - Romney 24.5 | 3rd - Paul 21.4 | 4th - Gingrich 13.3 | 5th - Perry 10.3
| Poll | Date | Huckabee | Romney | McCain | Thompson | Paul | Giuliani | Spread |
|---|---|---|---|---|---|---|---|---|
| RCP Average | 0 Days To Go | 29.7 | 26.7 | 11.8 | 11.7 | 7.3 | 6.0 | Huckabee +3.0 |
2008 Iowa Results: 1st - Huckabee 34.4 | 2nd - Romney 25.2 | 3rd - Thompson 13.4 | 4th - McCain 13.0 | 5th - Paul 9.9

28.6 Trump +4.7 | 23.9 Cruz | 16.9 Rubio | 7.7 Carson |
4.1 Paul | 4.1 Bush | 3.1 Huckabee | 2.9 Kasich |
2.6 Fiorina | 2.4 Christie | 1.1 Santorum | -- Jindal |
-- Pataki | -- Graham | -- Perry | -- Walker |
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22.8 Romney +1.3 | 21.5 Paul | 16.3 Santorum | 13.7 Gingrich |
11.5 Perry | 6.8 Bachmann | 2.3 Huntsman | -- Cain |
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