2003 Colorado Rockies season Game log April

| Date_ | Opponent | Score | Loss | Attendance | Record |
|---|---|---|---|---|---|
| April 13 | @ Padres | 6–2 | Cook (0–1) | 20316 | 7–5 |
| April 14 | @ Diamondbacks | 5–3 | Kim (0–3) | 25688 | 8–5 |
| April 15 | @ Diamondbacks | 12–1 | Patterson (0–1) | 31182 | 9–5 |
| April 16 | @ Diamondbacks | 4–3 | Jiménez (0–2) | 28588 | 9–6 |
| April 17 | @ Diamondbacks | 11–2 | Jennings (1–2) | 32507 | 9–7 |
| April 18 | Padres | 12–1 | Pérez (0–2) | 27609 | 10–7 |
| April 19 | Padres | 10–9 | Villafuerte (0–2) | 27031 | 11–7 |
| April 20 | Padres | 8–0 | Peavy (3–1) | 28005 | 12–7 |
| April 22 | @ Phillies | 5–2 | Oliver (0–2) | 13431 | 12–8 |
| April 23 | @ Phillies | 6–4 | Jennings (1–3) | 13444 | 12–9 |
| April 24 | @ Phillies | 9–1 | Cook (1–2) | 16947 | 12–10 |
| April 25 | Cubs | 11–7 | Cruz (3–1) | 32162 | 12–11 |