Enter your ZIP to see whether this is legal to plant in your state, and whether it survives your winter.
Lily is consistently rated fire resistant by extension, Firewise, and FireSmart sources.
Oregon State, Washington State, and University of Idaho extension services list Lilium among fire-resistant plants for home landscapes. Oregon State also profiles Asiatic lilies among perennials chosen for fire-resistant landscaping. Their guidance covers lilies suited to USDA zones 3a through 9b, so the recommendation applies across a broad growing range.
The numerical findings point the same way. Idaho Firewise gives lily a fire-resistance score of 10 out of 10, the end of its scale allowed as close as 10 feet from a structure. Colorado State University Extension and the Colorado State Forest Service also preserve a score of 10 out of 10 for Lilium species. On their scale, scores from 8 through 10 meet the standard for defensible-space zones 1 and 2. FireSmart BC separately includes lily among its approved fire-resistant plants.
These sources use different kinds of guidance, including expert selection, field-trial scoring, and a compiled approval program. Their agreement supports choosing lily for a fire-resistant landscape, though the rating describes relative suitability rather than a promise that the plant cannot burn.
Form
perennial
Rated in
British Columbia; Colorado / Rocky Mountain Front Range; OR/WA/ID; Pacific Northwest (Oregon / Washington / Idaho) +1
On this lot
1. Fire evidence and conditions
Fire evidence
Fire-resistant — location does not change the cited classification.
Colorado State University Extension and the Colorado State Forest Service publish Fact Sheet 6.305 for Colorado's WUI and varied ecosystems. FireApproved exposes all 114 exact source owners at Colorado publication scope while retaining score, elevation, water, and Idaho-carrier lineage. Publication scope is not suitability for every Colorado site or zone.
Southern Idaho (ID footprint); partial normalized coverage · 2013-11-08
The official database labels itself "For Southern Idaho" and describes Idaho residents at the urban-rangeland interface. FireApproved publishes 419 existing plant owners that cite its scored rows. This bounded Southern Idaho scope is regional context, not statewide coverage or a conclusion that the score transfers unchanged to every Idaho site.
The October 2023 joint Pacific Northwest Extension publication explicitly names Oregon, Washington, and Idaho and publishes more than 150 plant profiles. FireApproved has normalized 155 exact plant records from the source; publication scope does not assert that every listed plant suits every site within the three states.
2. Why this plant is relevant here
State distribution
Documented in ID, OR, WA.
Native range
Introduced / established
USDA hardiness
Documented range 3–9.
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.
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.
3–9 explicit range · whole zone precision · source stated
Source taxon: Lilium spp. · exact match.
Source location: Asiatic lilies profile, USDA hardiness zones field.
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.
Fire Resistance of Plants Master Database: plantable at 10' from home [Idaho minimum planting distance] (with its recommendation)
FireSmart BC Plant Program: suitable for HIZ intermediate zone (10-30 m) [FireSmart BC Home Ignition Zone] (with its recommendation)
Ignition-Resistant Landscape Plants: suitable for defensible-space zones 1-2 (score 8+) [CSU defensible-space zone] (with its recommendation)
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.
“Choose the right perennial plants for your fire-resistant landscape”
· original source
The Asiatic lilies profile prints Lilium spp.. The gallery points to PNW 590 for complete details.
Ignition-Resistant Landscape Plants (Fact Sheet 6.305) — Colorado State University Extension / Colorado State Forest Service (Wildfire Mitigation Series) · 2025 · original sourcePrimary evidenceField programlineage: idaho-tree resolves to Fire Resistance of Plants Master Database
“ignitability score 10 of 10”
· score 10 (idaho-0-10)
CSU 6.305 table lists Lilium spp. (lilies) with the preserved ignitability score.
