For the RMNP stop in at any or all of Kirk's Fly Shop, Estes Anglers, or Scot's Sporting Goods for reports or guides. My only experience with guides (many years ago) are through Scot's and I can highly recommend them and the folks in the shop are nice and friendly. I stop in and see them every year. I've shopped at Kirk's and Estes Anglers and they are nice too so I don't think you can go wrong. Scot's is a small shop with a mix low end gear, the other two are "boutique" fly shops with the higher end stuff and more selection.
Be prepared to be flexible up there this year. The Fern Lake Fire was finally put out in January and it burned a huge chunk of Big Thompson Valley and Moraine Park which may (probably will) adversely impact fishing on the Big Thompson drainage. I'm not sure what other drainages were affected so best to check it all out and plan accordingly