Class III Trees

The largest growing trees in Boise are in the Class III group.  These trees can get huge and provide a lot of shade and other benefits to Boise's streets and landscapes (see the Benefits of Trees). However, they also need lots of room to grow to reach their true potential without damaging sidewalks.  The information at the bottom of this page generally describes most Class III trees, for detailed descriptions about individual species, click the links below, email the City Forester or ask a nursery professional.

If you are having a street tree planted, check the planting work order you received, if "Class III" is indicated, you should choose from the list of Class III trees provided with the work order.  If you would like a different Class III species than those available, check the "Request Planting Permit" box and write the desired tree species down.  Please don't purchase the tree until Community Forestry has approved the permit. 

Here are some Class III species that may be appropriate:


Class III tree can mature to a height of 60-90 feet tall and beyond, with a similar crown spread.

A parkway strip of at least 10 feet in width is required before consideration is given to planting Class III species.

Don't plant these near overhead power lines!

Fall colors vary between species (and in species).  Check the descriptions or email the City Forester for details.

Every species grows best under certain conditions, usually relating to soil requirements and exposure to sunlight.  Check your planting site and tree details before deciding.

Some species are more drought tolerant than others, check tree details and know how much you do or can water before deciding. No tree is drought proof, all of these trees need regular watering throughout their lives to remain healthy.