The 31-year-old Irishman scored in the winning goal in Saturday night's 2-1 home victory over the Vancouver Whitecaps.
Entering the game with a league-low 12 goals scored in 2015, the Rapids took just two minutes to grab the lead through Vicente Sanchez but were pegged back 18 minutes later when Whitecaps winger Kekuta Manneh tapped in an equaliser.
The home side regained their lead 10 minutes into the second-half, however, when a delivery from Argentine midfielder Lucas Pittinari found Doyle in the box for the Irishman to head home for his first MLS goal.
Colorado would hold on for the rest of the match to snap their six-game winless run, after which the 31-year-old striker spoke of his relief at finally getting off the mark.
“It was a good ball into the box," he told the Denver Post at the final whistle. "I had to generate some power and thankfully it went in off the post. The last two or three games, we've had so many good opportunities and they just didn't seem to go in.
“That bit of luck went our way [Saturday], which we needed. To turn our season around, we needed that bit of luck."
Colorado’s victory was made all the more impressive by the fact that Vancouver had travelled to Denver tied for first place in the Western Conference with a game in hand over co-leaders Seattle Sounders, while the home side began the night with the worst record in the league – just two wins and 15 points from 17 matches.
Doyle, who arrived on a free transfer in early May following a six-year spell at Wolverhampton Wanderers, had been expected to solve some of their problems but has so struggled to get going over his first couple of months in the States.
Having scored 92 times in 357 appearances in England after joining Reading in 2005, Rapids fans are expecting him to make a big impact for their club going forward and will hope that last night’s goal sets the tone for things to come.