You can now get an Idaho CCW at the age of 18. 18-20 yer olds have to take the Enhanced Class and you will be issued the Standard Idaho CCW until you turn 21. At age 21 he permit will be updated to the Idaho Enhanced CCW. (18-20 year old don’t qualify for the Oregon CHL) If you are 17, you can take the class now and apply for your license when you turn 18.
The Enhanced CCW class schedule can be found here.