The 21-year old Bolivian, who has been with the Gunners since 2010, will spend time with Denver outfit as he strives to win a MLS contract.
"Samuel is a talented young player that we're eager to take a look at in preseason," said Rapids Technical Director Paul Bravo.
"We know that his background with Arsenal has given him a solid foundation, and his experience with the youth and full national teams from his country is a boost for such a young player."
Since moving to Arsenal, Galindo has had loan spells with Salamanca, Gimnastic, Lugo and Jorge Wilstermann while representing the Bolivian national team on two occasions.
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