Also called ◼︎ green spruce and ◼︎ white spruce.
Part of
spruce genus Picea
in
🌲︎ cedar / fir / hemlock / larch / pine / spruce family Pinaceae
in
🌲︎ conifer order Pinales.
Native to 🇺🇸 USA 🗻︎ Rocky Mountains: Colorado (as in its common name), Wyoming, Idaho, Utah, Arizona and New Mexico.
🗺 Map by county (🇺🇸 USA-48),
🗺 map (scroll down),
🗺 map (North America, Central America). 
Invasive > 🇨🇦 🇺🇸 Canada+USA
Invasive > report it!
🏛🌲︎ State tree of Colorado.
Uses by native peoples
(Ethnobotany database)
On No-Planting List by Seneca Nation of Indians SNI. (pages 59 and 63)
Picea hosts caterpillars of 158 species
of butterflies and moths, in some areas.
Outside the 🗻︎ Rocky Mountains, has been widely planted as an ornamental.
In Michigan and other areas, many ◼︎ Colorado blue spruce are dying or suffering from
spruce decline,
apparently caused by:
As an alternative,
CalvinU recommends replacing this plant
with (native to the same area, unfortunately)
◼︎ white fir Abies concolor.