Colorado Blue Spruce
Picea pungens glauca
Colorado Blue Spruce (Picea pungens glauca) is a Colorado-native tree suited to the Colorado Front Range, rated "Recommended" on the 2024 Front Range Tree Recommendation List. It matures to about 15 to 50 ft tall and 10 to 25 ft wide, slow-growing, needs medium to high water, and prefers full sun to partial shade. Very overplanted here; prone to needlecast and Cytospora canker in crowded spots.
Colorado nativemedium to high water15 to 50 ft tall and 10 to 25 ft wide
Photos
- Photo 1: "Picea pungens Glauca Pendula JPG1a" by Jean-Pol GRANDMONT is licensed under CC BY 2.5. To view a copy of this license, visit https://creativecommons.org/licenses/by/2.5/.
- Photo 2: "Picea pungens glauca" by Crusier is licensed under CC BY 3.0. To view a copy of this license, visit https://creativecommons.org/licenses/by/3.0/.
- Photo 3: "IMGP4870 Picea pungens 'Glauca' - Świerk kłujący" by Babij is licensed under CC BY-SA 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/2.0/.
- Photo 4: (c) Logan, some rights reserved (CC BY)
- Photo 5: (c) Lyrae, some rights reserved (CC BY), uploaded by Lyrae
- Photo 6: "Picea pungens 'Glauca Prostrata'2" by MDBolin is licensed under CC BY-SA 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/2.0/.
At a glance
Will it survive here?
- Hardiness zones
- USDA 2 to 7
- Water needs
- medium to high water
- Sun
- Best in full sun; tolerates partial shade.
- Soil
- clay, loam, sandy
- Soil pH
- 6.0 to 8.2
- Hail tolerance
- high
- Wind tolerance
- high
- Salt tolerance
- low
- Tolerates
- Cool north foundations
How big, what shape?
- Mature size
- 15 to 50 ft tall and 10 to 25 ft wide
- Mature form
- Pyramidal
- Spacing / clearance
- ~25 ft of clearance
- Growth rate
- Slow
- Lifespan
- Long-lived
What it looks like, and when
- Foliage
- Evergreen
Who else benefits
- Pollinator value
- low
- Deer
- Not rated
- Colorado native
- Yes
- Native ecoregion
- montane, riparian
Also worth knowing
- Fire rating
- Ignitable (CSU): keep 30+ ft from the house, thinned
Site factors to consider
- Critical: Cold HardinessThe average low suits it fine; our real cold risk is the swings, late frosts, and intense winter sun, so wrap young trunks and give it shelter.
- Critical: Salt ToleranceIt has low salt tolerance, so keep it back from de-iced sidewalks, roadsides, and softener runoff, where salt burns roots and leaf edges.
Common problems on the Front Range
- Spruce ips beetle in stressed trees
- Spruce spider mite on hot, dry sites
- Cytospora canker on lower branches
These are general tendencies for this group of plants on the Front Range, not a diagnosis. Many are stress-driven and preventable with good siting and watering. For a specific plant or an active problem, consult a certified arborist or your local CSU Extension office.
Frequently asked questions
- Is Colorado Blue Spruce good for the Colorado Front Range?
- Yes, Colorado Blue Spruce is a well-suited tree for Colorado's Front Range, rated "Recommended" on the 2024 Front Range Tree Recommendation List.
- How big does Colorado Blue Spruce get?
- It matures to about 15 to 50 ft tall and 10 to 25 ft wide.
- How much room does Colorado Blue Spruce need?
- Give Colorado Blue Spruce about 25 ft of clearance from buildings, fences, and other trees so the mature canopy isn't crowded.
- What shape does Colorado Blue Spruce grow into?
- Colorado Blue Spruce typically grows into a pyramidal, conical outline that is widest at the base. This is the species' usual mature form, named cultivars (columnar, weeping, or compact selections) can differ, so check the specific cultivar.
- Is Colorado Blue Spruce hardy on the Front Range?
- Colorado Blue Spruce is hardy in USDA 2 to 7. The Colorado Front Range spans roughly USDA 4b to 6a, so it is well within range. That said, it carries a cold-hardiness caution: The average low suits it fine; our real cold risk is the swings, late frosts, and intense winter sun, so wrap young trunks and give it shelter.
- How much water does Colorado Blue Spruce need?
- It needs medium to high water once established.
- How fast does Colorado Blue Spruce grow?
- Colorado Blue Spruce is a slow-growing tree. Growth rate depends on water and site conditions on the Front Range.
- How long does Colorado Blue Spruce live?
- Colorado Blue Spruce is long-lived, a multi-generational tree given good siting and care. Actual lifespan varies with site, water, and care.
- Is Colorado Blue Spruce native to Colorado?
- Yes. It is a Colorado native.
- Is Colorado Blue Spruce a good firewise plant near the house?
- Colorado Blue Spruce is listed by CSU Extension among the more ignitable plants, so keep it 30 or more feet from the house and keep it thinned and well maintained. This is general guidance based on CSU Extension Fact Sheet 6.305 (2025), not a guarantee that any plant won't burn, a well-irrigated, well-maintained plant is the goal. Follow CSU Extension defensible-space guidance and check with your local fire district before planting in the wildland-urban interface.
- Is Colorado Blue Spruce prone to pests or disease on the Front Range?
- Colorado Blue Spruce can be affected by spruce ips beetle in stressed trees and other issues common to this group on the Front Range. These are general tendencies, not a diagnosis, many are stress-driven and preventable with good siting and watering. For a specific plant or an active problem, consult a certified arborist or CSU Extension.
