The magazine used its VoteCastr model to analyze the 1.53 million early votes, representing 54.4 percent of the total expected vote.
Colorado, with its nine electoral votes, is considered to be a battleground state in Tuesday's US presidential election due to its independent electorate, but is believed to be on track to support a Democratic nominee for the third time in a row after shifting from its previously solid Republican stance.
The western mountain state has a modest population of almost 5.5 million, but is currently among the fastest growing states due to an influx of progressive-voting young professionals and Latinos which has driven its swing from red to blue over the past decade.
Colorado consistently voted Republican throughout the century with just two interruptions since 1952. It became a battleground for the first time during the 2008 election, when it supported the Democrat nominee Barack Obama against his Republican rival John McCain by an appreciable margin of over 10 percentage points. The state also gave its electoral votes to Obama in 2012, who beat Republican Mitt Romney by 51.49 percent to 46.13 percent.
In the Democratic Caucus in Colorado, Clinton lost to her rival Bernie Sanders, garnering only just above 40 percent of votes (or 49,314 ballots) as opposed to Sanders' 59 percent (or 72,115 ballots). The Republican Party also opted for a caucus, leaving non-member supporters out of the decision making process. The state thus backed Trump's rival Ted Cruz, much to the billionaire's dismay.
