DENVER -- The Colorado Rockies are powering their way to a hot streak.

Belting five home runs Sunday, including three in one inning, the Rockies overwhelmed the Pittsburgh Pirates 13-3 in the rubber game of a three-game series.

The win completed a 5-1 homestand for the Rockies, who have won six of their past seven games and in the process revived what had been a sputtering offense during a 5-15 tailspin. In the seven-game span, Colorado (58-42) erupted for 98 hits and 74 runs, tying the most runs in franchise history in a seven-game stretch.

Mark Reynolds hit two homers and Charlie Blackmon, Trevor Story and Pat Valaika each added a blast for the Rockies, who took a 4-0 lead with a four-run third inning and blew the game open with a seven-run sixth.

"I think as a group, top to bottom, we're having good at-bats right now, and we're hard to get out," said Blackmon, whose 24th homer gave him three hits for the game and 800 for his career. "And that can produce a lot of runs. That's what's happened the last few games."

After the Rockies batted around in the third inning without benefit of a home run, Blackmon got the slugging spree going in the fifth when he led off with an opposite-field homer to left on Ivan Nova's high 2-1 fastball.

After Carlos Gonzalez opened the sixth with a single, Story hit his 13th home run. Story was the last batter Nova faced. Ryan Hanigan greeted Wade LeBlanc with a single, and Valaika followed with a pinch-hit, two-run homer. It was Valaika's eighth home run of the season and second as a pinch hitter.

Nolan Arenado singled home DJ LeMahieu, who drew a walk and moved up on a wild pitch, and Reynolds homered to cap the sixth-inning outburst. Reynolds hit his second homer of the game and 22nd of the season in the eighth.

The strikeout-prone Story has gone 9-for-26 (.346) in the past seven games with two homers, 11 RBIs and a modest six strikeouts to raise his average to .238.

"I'm not swinging at the pitches that I shouldn't," Story said. "That's big for me. I haven't really been missing the ones that I've wanted to hit. That always equals good."

Rockies starter Kyle Freeland (10-7) gave up six hits and two runs in six innings with two walks and three strikeouts. He continued his remarkable success in day games, improving to 8-2 with a 2.90 ERA in daylight. Freeland got 14 outs on ground balls as he lowered his ERA to 3.64 with the 108-pitch outing.

"He creates top-hit action (on the ball), because his stuff is lively down in the zone," Colorado manager Bud Black said.

Nova (10-7) pitched a season-low-tying five-plus innings and allowed nine hits and seven runs, the most he has yielded since Aug. 25, 2015, against the Houston Astros while pitching for the New York Yankees. He left after facing two batters in the sixth, just the second time in 20 starts he has failed to pitch six innings.

"I thought he came out clean, the first two innings he looked good," Pirates manager Clint Hurdle said. "But then the ball started to elevate on him a little bit, and that's a hard combination here when you get behind in the count and up in the zone."

Story led off the four-run third with a walk and Hanigan singled. The runners moved into scoring position on Freeland's swinging bunt. Blackmon singled home a run as right fielder Jose Osuna took a poor route to the ball, and LeMahieu was hit by a pitch to load the bases for Arenado, who grounded a two-run single to left.

After Reynolds singled to load the bases, Ian Desmond hit a slow roller to third that netted the fourth run of the inning. Nova left the bases loaded by striking out Gonzalez to end the inning.

Freeland yielded a leadoff homer in the sixth to David Freese that trimmed the Rockies' lead to 5-2.

Josh Bell singled home a run with two outs in the fourth to cut Colorado's lead to 4-1. Freeland then gave up a single and issued a walk to load the bases but eased out of that jam by getting Jordy Mercer to ground out.

"Sinker worked well," Freeland said. "We were able to move it where we wanted to today. Back-door slider was a great pitch today. It kept them extremely off-balance."

NOTES: Rockies OF Gerardo Parra did not play for the second straight day due to a bruised right calf but might return to the lineup Monday. ... Rockies RHP Tyler Chatwood (right calf strain) is scheduled to throw a two-inning simulated game Monday at St. Louis. ... Rockies CF Charlie Blackmon has 20 doubles, 13 triples and 23 homers and is bidding to be the first 20-20-20 player since Curtis Granderson (38-23-23) and Jimmy Rollins (38-20-30) both accomplished the feat in 2007. ... Pirates 1B Josh Bell's run-scoring single in the fourth inning gave him 17 RBIs in 18 games this month. ... Pirates LF Starling Marte, who went 2-for-5, is 29-for-58 (.500) in 14 career games at Coors Field.