Hi Heather! Welcome to Colorado!
I operate 4 STRs here in Colorado Springs and have had a similar experience to Robin. Booked solid. It is the second most visited city in the state next to Denver (which is not a friendly STR market).
We have been seeing very strong cashflow, especially in the summer months. A lot of people visit year round since we have 3 large Universities (USAF, UCCS, CC) as well as large hospitals, and several military bases - this leads to a lot of visiting family. While summer is the hottest, the winter can be great as long as you are in the right location.
All of our units are SFH, which has worked out great for the demographic visiting the city!
As far as ski towns go, you are sure to pay a much higher price to get into the market, and have stricter regulations. I find that most ski town STRs have very high rates in the winter, moderate rates in the summer, and lowest rates on the shoulder seasons (March-May, Oct-Nov). On the front range and in Colorado Springs specifically, we see higher rates in the summer and lower in the winter. From my experience, this is just a part of being in Colorado. This being said, Colorado Springs doesnt have as significant of nightly rate swings as a ski town would.
I know you mentioned milder summers than what you would have in COS. Not sure what part of the country you are coming from, but we have had only a handful of days above 90 degrees this summer, and the nights cool off into the mid to low 50s. With that, we rarely need to turn on our AC but for maybe a couple weeks in early August.
The city also provides great potential for ROI as the city has been rapidly expanding, but housing prices are still much more affordable compared to other cities on the Front Range and in the mountains.
Good Luck! Feel free to PM me if you want to connect more.