The Rockies will travel home to face the Mariners after reeling off eight consecutive road wins.
Colorado defeated Milwaukee 5-4 on Thursday night.
"Now we have to take this home with us to our fans and get our house in order," manager Jim Tracy said. "Because we're a much better team at home than 9-14."
The Rockies are 10-4 under Tracy, who took over for Clint Hurdle on May 29.
Rockies Go Home After Eight Straight Road Wins