Let’s start with the “Life Zone” most similar to where I grew up in Iowa. The Plains Life Zone
Now granted I grew up at 500 ft elevation, in Colorado the Plains Zone is considered to be from 3,500 ft to 5,500 ft elevation. But the similarity comes in because they are both dominated by grasslands and cottonwoods. So I get to grow some childhood favorites, like fountain grass and little blue stem. But unfortunately some of my childhood favorites don’t grow as well thanks to the 3-4,000 ft elevation difference are birches and most oak trees.
What can the areas of the city under 5,500 ft grow? (this would be areas in the downtown region, Broadmoor, Fountain, etc) These areas get to play around with the plants zoned for 4 and 5, this includes Cottonwoods (not recommended), White Firs (yeah Christmas Trees!), and BONUS fruit trees of all sorts. But please, PLEASE do not try rhododendrons and be very cautious with hazelnuts or forsythias. Although we, in Colorado Springs and the Front Range, are rated for zones 4 and 5 we are still well above sea level, so please use caution.