Apple and cherry Trees like it here as well. You can not forget about the "Blue Spruce"
Pine trees take more care to get rooted but thrive. For the first year or 2 you can not "forget" about the trees till they take. You will need to make sure the root ball is moist.
You can Google your question for more info.
Hope this helps,
Cotton wood and Aspen trees, while pretty, are a mess and grow too fast. This means they will break easy in the wind, die fast.
That said, these trees offer great fall color and sound good in the wind.
Our cottonwoods and maples survived OK. The spruce trees, of course, did fine.
The trick is to shake your trees when there is a big storm. Our son took a broom out and pushed on some limbs (without harming the bark). The snow was up to his knees. He didn't wait for the snow to stop flying and he had to go back after enough snow accumulated again. But shaking (not too vigorously) did the trick.
The big snows tend to carry a lot of moisture. The extra weight is too much for most trees. Be careful, though. You don't want to be out there if your tree branches are touching power lines. (Yikes!) In Longmont, you want to call when its nice out and have the limbs trimmed.
The utility company (which is the city of Longmont) will trim trees in the right of way. But, homeowners are responsible for trimming any limbs growing from their private property into the right of way. See this link for details:
Contact the city from 7 a.m. to 3 p.m. to turn off power by calling (303) 651-8386.
This is the third home I have owned in 20 years inBoulder County. We planted Ponderosa and Austrian Pines which have all done well. The aspens have always been disappointing after just afew years, they get black leaves and eventually diseases that make them look terrible. The garden centers advise against planting them here but they still sell them. I love our honey locust trees and our maples. The Cottonwoods and Aspens send roots out all over and tiny baby trees that make your lawn uneven and dangerous to walk on in bare feet.
You are going to have expensive trimming with a tree like a cottonwood. Great trees for shade, though. So, the cottonwood earns its living if it shades the house.
Aspens are popular and very "Colorado", but die off in 10 years in lower elevations. Blue Spruces are very "Colorado",but take up a LOT of space. Cottonwoods heave sidewalks with their roots.
I paid $125.00 for a designer from The Tree Farm in Longmont to come to my house and map out suggestions.
Best money I ever spent The trees he suggested (Pear) didn't encroach on the neighbors property or sidewalks, so I don't have to have expensive tree service.
In Boulder and Longmont there has been a long tradition of planting a wide variety of trees, many not indigenous to the area. And they all seem to thrive once they get going, though they sometimes need a little extra water. Two that I especially like are redbuds, with flower-covered branches in the spring and heart-shaped flowers in the summer; and catalpas, which are a little weedy in that they grow fast, but which also can have gracefully curved trunks as they reach for sunlight.