{"id":"us-mt","slug":"montana","name":"Montana","license":"CC-BY-4.0","placeNode":"/places/us-mt.json","construction":{"reviewStatus":"coming-soon","applications":[],"localApplications":[],"requirements":[],"sources":[{"title":"ARM 24.301.181 Incorporation by reference of IWUIC","url":"https://www.law.cornell.edu/regulations/montana/Mont-Admin-r-24.301.181","publisher":"Montana Secretary of State (via LII)","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z"},{"title":"Current Codes","url":"https://bsd.dli.mt.gov/building-codes-permits/current-codes","publisher":"Montana Department of Labor and Industry, Building and Safety Division","sourceType":"official","accessedOn":"2026-08-26T00:00:00.000Z"}]},"localAuthorities":[],"claims":{"exact":[{"id":"guide:covering-vs-assembly:13","anchor":"local-us-mt-covering-vs-assembly-13","place":"Montana ARM 24.301.181 (local election)","placeId":"us-mt","scopeKind":"place","scopeMode":"exact","scopeRef":null,"claim":"ARM 24.301.181(21) replaces 2021 IWUIC Table 503.1. Extreme hazard with nonconforming defensible space is IR1 N.C. High/nonconforming is IR1. Moderate/nonconforming is IR2. Chapter 5 remains. Locals that elect IWUIC still map WUI areas.","asOf":"2026-08-24T00:00:00.000Z","object":{"kind":"guide","id":"covering-vs-assembly","title":"Covering versus assembly","url":"/guides/covering-vs-assembly/"},"source":{"title":"ARM 24.301.181 Incorporation by reference of IWUIC","url":"https://www.law.cornell.edu/regulations/montana/Mont-Admin-r-24.301.181","publisher":"Montana Secretary of State (via LII)","sourceType":"official","accessedOn":"2026-08-24T00:00:00.000Z"}},{"id":"guide:how-wui-is-mapped:13","anchor":"local-us-mt-how-wui-is-mapped-13","place":"Montana statewide (local WUI declaration)","placeId":"us-mt","scopeKind":"place","scopeMode":"exact","scopeRef":null,"claim":"ARM 24.301.181(2) replaces IWUIC Section 302. The governmental body or another official agency shall declare WUI areas. Cities, counties, and towns that elect to enforce the IWUIC record those areas on maps available for inspection.","asOf":"2026-08-24T00:00:00.000Z","object":{"kind":"guide","id":"how-wui-is-mapped","title":"How the WUI is mapped","url":"/guides/how-wui-is-mapped/"},"source":{"title":"ARM 24.301.181 Incorporation by reference of IWUIC","url":"https://www.law.cornell.edu/regulations/montana/Mont-Admin-r-24.301.181","publisher":"Montana Secretary of State (via LII)","sourceType":"official","accessedOn":"2026-08-24T00:00:00.000Z"}},{"id":"guide:ignition-resistant-vs-noncombustible:2","anchor":"local-us-mt-ignition-resistant-vs-noncombustible-2","place":"Montana ARM 24.301.181 (local election)","placeId":"us-mt","scopeKind":"place","scopeMode":"exact","scopeRef":null,"claim":"ARM 24.301.181(21) replaces Table 503.1 with IR1, IR2, and IR3 construction classes by fire-hazard severity and defensible space. Those are IWUIC building classes, not Oregon’s ignition-resistant material test. Chapter 5 remains. Confirm with the building official.","asOf":"2026-08-24T00:00:00.000Z","object":{"kind":"guide","id":"ignition-resistant-vs-noncombustible","title":"Ignition-resistant versus noncombustible","url":"/guides/ignition-resistant-vs-noncombustible/"},"source":{"title":"ARM 24.301.181 Incorporation by reference of IWUIC","url":"https://www.law.cornell.edu/regulations/montana/Mont-Admin-r-24.301.181","publisher":"Montana Secretary of State (via LII)","sourceType":"official","accessedOn":"2026-08-24T00:00:00.000Z"}},{"id":"standard:iwuic:15","anchor":"local-us-mt-iwuic-15","place":"Montana statewide (2021 IWUIC, local election)","placeId":"us-mt","scopeKind":"place","scopeMode":"exact","scopeRef":"iwuic","claim":"ARM 24.301.181 adopts the 2021 IWUIC with Appendix B and Appendix C. Chapter 4 and Section 602 are deleted. Subsection (21) replaces Table 503.1 so extreme/nonconforming is IR1 N.C., high/nonconforming is IR1, and moderate/nonconforming is IR2. Cities, counties, and towns that adopted IBC or IRC will, if they elect to enforce the IWUIC, record WUI areas on public maps.","asOf":"2026-08-24T00:00:00.000Z","object":{"kind":"standard","id":"iwuic","title":"International Wildland-Urban Interface Code","url":"/standards/iwuic/"},"source":{"title":"ARM 24.301.181 Incorporation by reference of IWUIC","url":"https://www.law.cornell.edu/regulations/montana/Mont-Admin-r-24.301.181","publisher":"Montana Secretary of State (via LII)","sourceType":"official","accessedOn":"2026-08-24T00:00:00.000Z"}},{"id":"guide:montana-wui-code-status:1","anchor":"local-us-mt-montana-wui-code-status-1","place":"Montana statewide (2021 IWUIC, local election)","placeId":"us-mt","scopeKind":"place","scopeMode":"exact","scopeRef":null,"claim":"ARM 24.301.181 adopts the 2021 IWUIC with Appendix B and Appendix C. Cities, counties, and towns that adopted IBC or IRC will, if they elect to enforce the IWUIC, record official WUI areas on public maps. Chapter 4 and Section 602 are deleted. Confirm with the building official.","asOf":"2026-08-24T00:00:00.000Z","object":{"kind":"guide","id":"montana-wui-code-status","title":"Montana WUI code status","url":"/guides/montana-wui-code-status/"},"source":{"title":"ARM 24.301.181 Incorporation by reference of IWUIC","url":"https://www.law.cornell.edu/regulations/montana/Mont-Admin-r-24.301.181","publisher":"Montana Secretary of State (via LII)","sourceType":"official","accessedOn":"2026-08-24T00:00:00.000Z"}},{"id":"guide:what-did-msu-actually-rate:1","anchor":"local-us-mt-what-did-msu-actually-rate-1","place":"MSU Extension MontGuide MT200101AG (current as of 4/22)","placeId":"us-mt","scopeKind":"place","scopeMode":"descendants","scopeRef":null,"claim":"Any plant will burn if it is dry enough and the fire slow enough and hot enough. Fire-resistant plants have supple, moist leaves and water-like sap. Flammable plants generally have aromatic leaves, with gummy or resinous sap. Junipers are a good example of a highly flammable plant that should not be used as a foundation plant. Under forest conditions, tree species with thicker, corky bark — western larch, ponderosa pine, Douglas fir, and bur oak — often escape severe fire damage. Those with thinner bark, such as alpine fir, Engelmann spruce and lodgepole pine, are more likely to be killed by ground fires. Conifers as a group are considered more susceptible to fire damage than deciduous species because of their high resin content. Following are lists of plant species adapted to Montana that have been noted to be fire resistant. Not all species on this list will grow in all parts of the state. Some references list only a genus while others list particular species. In one case, an entire family (Rose) is generally considered to be fire-resistant.","asOf":"2026-08-25T00:00:00.000Z","object":{"kind":"guide","id":"what-did-msu-actually-rate","title":"What did MSU actually rate","url":"/guides/what-did-msu-actually-rate/"},"source":{"title":"Fire-Resistant Plants for Montana Landscapes (MT200101AG)","url":"https://extension-store.montana.edu/assets/publications/montguidepdfs/mt200101ag-fire-resistant-plants.pdf","publisher":"Montana State University Extension","sourceType":"official","accessedOn":"2026-08-25T00:00:00.000Z","documentDate":"2022-04-01T00:00:00.000Z"}},{"id":"guide:what-did-msu-actually-rate:2","anchor":"local-us-mt-what-did-msu-actually-rate-2","place":"MSU Extension MontGuide MT202104AG (NEW 1/21)","placeId":"us-mt","scopeKind":"place","scopeMode":"descendants","scopeRef":null,"claim":"Location and arrangement of landscape vegetation should take priority over whether plants are fire resistant or not. From a wildfire risk reduction perspective, deciduous trees and shrubs (such as aspen) are often preferred over coniferous vegetation (such as juniper or fir). The maintained area next to a home extends out 100 feet (Home Ignition Zone). The distance between trees and structures should be increased if they are situated on a steep slope. Even with fire-resistant landscaping, annual maintenance and fire-resistant construction, a property does not become fire proof.","asOf":"2026-08-25T00:00:00.000Z","object":{"kind":"guide","id":"what-did-msu-actually-rate","title":"What did MSU actually rate","url":"/guides/what-did-msu-actually-rate/"},"source":{"title":"Fire-Resistant Landscaping Considerations for Montana’s Wildland Urban Interface (MT202104AG)","url":"https://extension-store.montana.edu/assets/publications/montguidepdfs/mt202104ag-fire-resistant-landscaping.pdf","publisher":"Montana State University Extension","sourceType":"official","accessedOn":"2026-08-25T00:00:00.000Z","documentDate":"2021-01-01T00:00:00.000Z"}}],"local":[]},"placeFocusedGuides":[{"id":"montana-wui-code-status","title":"Montana WUI code status","url":"/guides/montana-wui-code-status/"}],"findings":[],"plants":{"grain":"state","total":367,"nativeDocumented":0,"invasiveOrNoxiousFlagged":94,"fireResistant":214,"keepAway":27,"conflicts":9,"page":"/grow/montana/"},"fireEvidencePublicationScope":{"answerGrain":"typed-state-source","sourceCount":1}}