Harden My Heart by Quarterflash first appeared on the Israeli foreign-music chart on 21 Dec 1981, entering at #15. It peaked at #4 on 18 Jan 1982. In total it spent 10 weeks on the chart, last charting on 22 Feb 1982.
| Wk | Date | Pos |
|---|---|---|
| 1 | 21 Dec 1981 | 15 |
| 2 | 28 Dec 1981 | 12 |
| 3 | 4 Jan 1982 | 8 |
| 4 | 11 Jan 1982 | 5 |
| 5 | 18 Jan 1982 | 4 |
| 6 | 25 Jan 1982 | 11 |
| 7 | 1 Feb 1982 | 15 |
| 8 | 8 Feb 1982 | 21 |
| 9 | 15 Feb 1982 | 32 |
| 10 | 22 Feb 1982 | 39 |