The Cook Political Report:

Lean: These are considered competitive races but one party has an advantage. Toss-Up: These are the most competitive; either party has a good chance of winning.
LEAN DEMOCRATIC
CO-7 Ed Perlmutter D+4
DEMOCRATIC TOSS UP
CO-3 John Salazar R+5
LEAN REPUBLICAN
CO-4 Betsy Markey R+6

The Rothenberg Political Report:

Democrat Favored
CO 7 D Perlmutter
Toss-up/Tilt Republican
CO 3 D J.Salazar
Republican Favored
CO 4 D Markey

FiveThirtyEight on New York Times:

CO-4 Gardner (R) 85.9% chance of winning

CO-3 Tipton (R) 76.0% chance of winning

CO-7 Perlmutter (D) 92.3% chance of winning