The forward, who spent the first half of the 2017/18 season with Burton Albion, joins Anthony Hudson’s Rapids ahead of their 2018 campaign, which begins tonight against Toronto FC in the CONCACAF Champions League.
The 26-year-old follows former Wolves teammate Jack Price to Commerce City after the midfielder made a permanent switch in January, putting pen-to-paper on a four-year-deal.
Mason joined Wolves from Cardiff City in January 2016 and has since made 39 appearances for the Club, scoring seven times in all competitions.
Everyone at Wolves would like to wish Joe the very best of luck for his loan spell with Colorado Rapids.