For reference, Denver is at around 5200 feet elevation. Days in November also can see temperatures in the 70s (F) or higher. But a high of 70F one day can be followed by a high of 45F the next. And the temp can vary 30F in one day, being 40F in the morning and 70F in the afternoon, for example. Either 0F or 75F would be rare in November.

I think Estes is around 8000'. It often receives its first snowfall before Halloween (10/31). At times the snow in Denver/Boulder comes overnight or in the morning and much is evaporated by the end of the day, especially in sunny areas.

In decent weather, a full day circle trip would be Denver to (Longmont or Loveland) to Estes then to Nederland to Central City/Blackhawk to Idaho Springs to Denver. In RMNP, even if Trail Ridge Road is closed at the top, you may still be able to drive several miles up it, then park and walk further. This circle trip could easily be turned into an overnight. Lots of good places to eat, shop, walk/hike, or gamble on that route.

For something a little warmer (probably), on a sunny day it would be easy to spend several hours around the Garden of the Gods in Colorado Springs, an hour or so south of Denver.

Going out from Denver to the Southwest, West, or Northwest, you will be gaining significant elevation, so it may be best to defer those trips until you have had time to get used to the elevation in Denver, and take gallons of water with you (and consume it) when you go.

Hope that helps and that you enjoy your visit.

TRRed