NV is not a swing state this year.
If it's not a swing state "this year", then when will it be? Trump is actually a much better fit for NV than for CO.
In midterms, it could still be competitive, but if Republicans can't do better among Latinos, NV is a blue state in presidential years. Trump is an awful fit for both, and NV is more Democratic than CO.
It won't be competitive in midterms until Sandoval stops running. Since Sandoval may be running for Senate and switching jobs with Heller, I don't know that it will be competitive in 2018.
That said, I fully expect Colorado will be Tossup this election, while Nevada will be Tilt/Lean D.