Enter your ZIP to see whether this is legal to plant in your state, and whether it survives your winter.
No.
Blue spruce is highly flammable, and the practical guidance is to keep it away from structures.
Four advisory sources reach the same conclusion. The USDA Forest Service and state Firewise programs rate blue spruce “Not Firewise 4,” the least favorable category on their four-point scale. Ohio State University Extension assigns H flammability, one step below the top of its five-band scale. Virginia Cooperative Extension also assigns H, the highest rating on its three-point scale. The Diputació de Girona and Catalonia’s fire service call it “muy desaconsejada,” using a method that weighs fire research, fuel structure, maintenance, origin, invasiveness, and firefighting experience.
Their descriptions add reasons for caution. The Firewise programs identify stiff branching and stiff, sharp needles. Ohio State describes the tree as drought tolerant, insect- and disease-prone, and prone to windthrow. Virginia Tech describes it as very drought tolerant and not heat tolerant. Blue spruce is a pine-family tree reaching about 75 feet at maturity, so choosing its location has substantial consequences.
A laboratory measurement provides context: live, unpredried leaves collected in spring took 232 seconds to produce flame in a calorimeter. FLAMITS preserves measurements with their experimental conditions but sets no common threshold across unlike variables, devices, and plant parts. That measurement does not reverse the consistent guidance from the four advisory sources: blue spruce should not be treated as a fire-resistant choice near a structure.
Ohio State University Extension Bulletin 921 is an Ohio publication that describes Ohio fire seasons and landscape conditions and labels nativity to Ohio. FireApproved publishes 352 exact source-owning plant records from its eight rated tables. This historical publication scope does not assert current extension endorsement or that a listed plant suits every Ohio site.
Virginia Cooperative Extension's publication opens with Virginia wildfire conditions, identifies its Virginia Firewise Landscaping Task Force, and labels plants native to Virginia. FireApproved publishes 306 exact source owners. Publication scope does not establish parcel suitability or current endorsement of this archived 2009 list.
2. Why this plant is relevant here
State distribution
Documented in AZ, CO, DC, DE, ID, MD, ME, MN, NJ, NM, NY, OH, PA, UT, WV, WY.
Native range
Current cited native range in AZ, CO, ID, MT, NM, UT, WY.
Introduced / established
2 sourced range or established records. This is not an invasive warning.
USDA hardiness
Documented minimum 3a; no upper limit is documented.
3. Legal, ecological, and broader status
Legal-list status
Seed-list status
Reported invasive here
Broader regional context
Federal context
How to read this page
The status above is computed from the cited rows below: independent recommendations can support a fire-resistant result, an avoid row can produce keep-away, and disagreement stays visible as conflict. Placement notes preserve each source’s own scheme rather than translating unlike rules into one scale. This is evidence about a plant, not permission to plant it in every part of the defensible space; Zone 0 remains noncombustible.
Native and introduced range evidence
These are exact U.S. botanical-area records from the cited range source. Native and
introduced describe biogeographic relationship, not fire performance or planting approval.
Doubtful and extinct rows stay visible but do not count as current presence.
The lossless worldwide derivative is retained once in the research corpus; object pages repeat only exact U.S. areas needed by the local lens. The JSON twin carries the same page assertions.
Plant hardiness evidence
These values describe the plant source. Your ZIP zone comes from the separate 2023 USDA
Plant Hardiness Zone Map. Whole-zone values stay whole-zone, and a single unresolved value
is not treated as a tolerance range. Different source boundaries stay separate: overlapping
statements are compared independently, while only ranges with no shared zone are called a conflict.
Source prints 4 · single-value meaning unresolved · whole zone precision · source stated
Source taxon: Picea pungens · exact match.
Source location: Cold Hardiness Zone field in the recovered selector record.
Not used for comparison: The recovered selector prints one Cold Hardiness Zone value but does not define it as a minimum threshold or a one-zone range.
Source location: PlantCharacteristics record 15393, Temperature, Minimum (°F).
Where its sources say to plant it
Placement rules below use each source's own distances or named zones, tied to its rating.
They are not interchangeable with the directory's current Zone 0 guidance.
Eastern United States Fire Performance Plant Selector: Landscape Zone 3 — 10–30 ft from the structure; thin vegetation, remove debris, and minimize plant massing [Fire Performance Plant Selector landscape zone] (with its avoid rating)
Firewise Landscaping: keep 30 ft from the home (Zone 3) [OSU B921 source-category siting] (with its avoid rating)
Guía de pirojardinería: not suitable inside or outside the 25-metre maximum-risk zone [girona-2020-iuf-25m-suitability] (with its avoid rating)
The evidence
Grouped by what each source concluded. Primary evidence rated the plant itself
(a lab, field program, or original curation); corroboration compiled or
republished another source's rating and resolves to its root lineage.
Picea pungens is rated “MUY DESACONSEJADA” by the guide's qualitative IUF garden-suitability method. The method assumes species-specific care and integrates fire evidence with fuel structure, maintenance, origin, invasiveness, and expert fire-service experience.
Listed without a rating (6)Corroboration (6 rows from 1 source)
6 cited rows from this source; its identity, lineage and tier are stated once.
Primary study White1997: White, R. H., DeMars, D., & Bishop, M. (1997). Flammability of Christmas trees and other vegetation. Proceedings of the 24th international conference on fire safety. Melbourne, Australia.
Shared row context: plant part leaves; fuel live; predrying no; device calorimeter; site White1997-1; sampling spring.
