Jason Jennings (4-6) gave up five runs in the first three innings but recovered to earn the win. He allowed 10 hits with five strikeouts in 5 1/3 innings.
Quintanilla hit a two-run triple in the fourth to give the Rockies a 6-5 lead they never relinquished. Before his hit to right-center, Quintanilla was 0-for-5 with four strikeouts since being called up from Triple-A Colorado Springs on June 3. He also added a single.
Jamey Carroll's RBI triple in the fourth chased Los Angeles starter Brett Tomko. Jorge Piedra hit his first home run of the season in the eighth to make it 12-9.
Tomko (5-5) lasted only 3 2/3 innings, giving up seven runs and six hits.
Todd Martin pitched to one batter -- getting Kenny Lofton to hit into a double play -- in the sixth, but Ramon Ramirez couldn't close the door on the Dodgers in the seventh.
Ramirez gave up a career-high four runs and got only two outs. He had pitched 11 1/3 scoreless innings of relief before giving up an RBI double to Willy Aybar and a three-run homer to Russell Martin, who finished with a career-high four RBI.
Jose Mesa pitched 1 1/3 scoreless innings before handing the ball to closer Brian Fuentes, who got three outs to earn his 13th save in 14 chances.
A day after managing only five hits off Brad Penny and Takashi Saito, the Rockies had 12 hits, including five for extra bases.
Coors Field has become J.D. Drew's home away from home. He went 3-for-3 with a triple, double, single and a sacrifice fly. He's hitting .377 in his career at Coors. Drew tripled leading off the third and scored on Matt Kemp's double to center. Kemp scored on a bloop single by Martin.
The Dodgers never allowed Jennings to settle into the game. They scored three runs on five hits in the opening inning.
Jennings has struggled in the first frame all season, giving up 14 runs.
In the first, Drew had a sacrifice fly and Kemp added an RBI single. Kemp later scored on a wild pitch.
The lead didn't last as Colorado answered with three runs in the bottom half. After Cory Sullivan singled and Todd Helton drew a walk, Atkins hit a two-out homer to center.
Colorado's win snapped its five-game losing streak to the Dodgers.
Nomar Garciaparra extended his hitting streak to 13 games with a single in the eighth. Every starter in the Dodgers' lineup had a hit.
Newly acquired INF Kaz Matsui visited the Rockies' clubhouse. He is scheduled to report to Triple-A Colorado Springs on Monday. ... Los Angeles RHP Eric Gagne was unavailable due to a second straight day of pain in his surgically repaired right elbow.