Polling Data
| RCP Average | 6/7 – 5/1 | — | — | 44.0 | 43.0 | Greenfield +1.0 |
| Des Moines RegisterDM Register | 6/7 – 6/10 | 674 LV | 3.8 | 46 | 43 | Greenfield +3 |
| PPP (D)PPP (D) | 4/30 – 5/1 | 1222 RV | 2.8 | 42 | 43 | Ernst +1 |
All Iowa Senate – Ernst vs. Greenfield Polling Data
Polling Data
| RCP Average | 6/7 – 5/1 | — | — | 44.0 | 43.0 | Greenfield +1.0 |
| Des Moines RegisterDM Register | 6/7 – 6/10 | 674 LV | 3.8 | 46 | 43 | Greenfield +3 |
| PPP (D)PPP (D) | 4/30 – 5/1 | 1222 RV | 2.8 | 42 | 43 | Ernst +1 |
