Picea pungens Colorado Blue Spruce Size: 30 to 60' in height with a 10 to 20' spread under average landscape conditions. Hardiness: Zone 3 to 7(8) Habit: A dense, regular narrow to broad pyramidal with horizontal stiff branches to the ground. Rate: Slow-medium, 30 to 50' after 35 to 50 years. Culture: Sun.