Did This Parcel Burn? CAL FIRE Perimeters and Hazard Zones Before a Tax Sale

Most of the tax-sale land in Placer, Nevada, El Dorado and Calaveras counties sits in the Sierra foothills, which means most of it sits in fire country. Two public map layers describe that risk, and buyers routinely confuse them. One records what has already burned. The other rates how likely a place is to burn badly in future, and carries legal consequences for anyone who builds, insures or resells there.

This article separates the two, explains why the date of a past burn matters, and gives the counts for the parcels currently listed.

Map one: fire history (what has burned)

CAL FIRE's Fire and Resource Assessment Program (FRAP) maintains a statewide database of wildfire perimeters. It reaches back to the 1800s for a few large fires and is reasonably complete from 1950 onward for fires on state and federal responsibility land above a size threshold. Each polygon carries a fire name, a year and the agency that mapped it.

A parcel that falls inside a perimeter burned. That is all the layer says. It does not say what was on the parcel at the time, how hot the fire was, whether structures were lost, or what has grown back since. Small fires below the mapping threshold, and structure fires that never became wildland fires, are not in it.

Map two: fire hazard severity (how badly it could burn)

The Fire Hazard Severity Zone (FHSZ) map is produced by the Office of the State Fire Marshal. It models fuel, slope, weather and ember exposure to rate land as Moderate, High or Very High hazard. It is a hazard model, not a history: an area can be rated Very High having never burned in the record, and a recent burn scar can be rated Very High because the brush is coming back.

Two versions exist, and the difference matters:

• State Responsibility Area (SRA) — land where CAL FIRE has primary wildfire protection duty, mostly unincorporated. The current SRA maps took effect on April 1, 2024, and rate every SRA acre Moderate, High or Very High.
• Local Responsibility Area (LRA) — cities and some unincorporated areas served by local fire departments. OSFM issued updated LRA recommendations in early 2025, and each local agency adopts them by ordinance. Historically only Very High was mapped in LRA; the 2025 maps add Moderate and High.

A zone rating is not just information. It triggers obligations:

Trigger	What it requires	Authority
Any SRA, or Very High LRA	Ignition-resistant construction on new buildings: Chapter 7A of the California Building Code (vents, eaves, siding, decks, glazing)	Gov. Code §51189; CBC Ch. 7A
Any SRA	100 feet of defensible space around structures, inspected by CAL FIRE	Pub. Res. Code §4291
Very High LRA	Same 100-foot standard, enforced locally	Gov. Code §51182
Sale of a home in a High or Very High zone	Seller must document a defensible-space inspection or the buyer must agree to obtain one	Civ. Code §1102.19 (AB 38, since July 2021)
Any resale	Natural Hazard Disclosure statement must state whether the parcel is in a Very High FHSZ or an SRA	Civ. Code §1103
Insurance	Not a legal requirement, but carriers use the zone and their own models; many decline, leaving the California FAIR Plan	—

A tax collector does not deliver a Natural Hazard Disclosure to the winning bidder. The obligation falls on you when you resell. What you buy at a tax sale, you buy with the zone attached.

Why the year of a burn matters

A parcel inside the 1988 49'er Fire perimeter in Nevada County and a parcel inside the 2015 Butte Fire perimeter in Calaveras County both "burned." They are not the same fact.

Fuel. Foothill chaparral and oak woodland regrow to pre-fire fuel loads in roughly 15 to 30 years, depending on species and rainfall. A 1988 scar is, by now, fully re-vegetated and rates as ordinary hazard for its terrain. A 2015 scar is in the middle of that regrowth curve: standing dead timber may still be up, brush is dense, and the hazard model often rates it Very High for exactly that reason.

Structures. If a house stood on the parcel when it burned, the assessor's roll may still carry improvement value for a building that no longer exists — or may carry none, because the county removed it after the fire. Either way, a burned lot with a foundation, a well and a septic system is a different purchase from raw land. The Butte Fire destroyed more than 500 homes across Calaveras and Amador; the 2021 Caldor Fire destroyed hundreds more in El Dorado. Some of those lots have made their way to tax sale.

Debris and hazard trees. Post-2015 burn lots may carry cleared-debris liens or hazard-tree removal costs. Those costs can attach to the parcel and, depending on how they were recorded, may or may not be extinguished by a tax deed. Check the recorder.

Insurance memory. Carriers' models weight recent fire history heavily. A 2021 burn scar is a harder insurance conversation than a 1979 one.

So when you see "burned," ask the year before anything else.

The numbers for the four live counties

For every non-timeshare parcel on the current lists with a county polygon, we intersect the polygon with the FRAP perimeter layer (1950 onward) and read the FHSZ rating at the parcel. As of September 22, 2026:

County	Live parcels	Inside a recorded fire perimeter	Very High	High	Moderate	Not mapped
Calaveras	44	14	34	9	0	1
El Dorado	38	5	32	3	2	1
Nevada	40	9	33	3	1	3
Placer	36	2	25	1	2	8
Total	158	30 (19.0%)	124 (78.5%)	16	5	13

Thirty of 158 parcels sit inside at least one recorded perimeter. One hundred and twenty-four — 78.5% — are rated Very High. That second figure is the one to internalise: in these four counties, Very High is the default, not the exception. The 13 parcels with no rating are either in an LRA whose local map we do not yet carry, or sit on a polygon we could not resolve; treat "not mapped" as unknown, not as safe.

The fire-history column splits sharply by age:

County	Fires touching listed parcels (year, parcels)
Calaveras	Butte 2015 (7); Gulch 1992 (2); Fowler Peak 1979 (2); Tiscornia 1967 (1); Hiway 4 1958 (1); Comanche 1955 (1)
El Dorado	Caldor 2021 (2); Scott 1996 (1); Chili Bar 1979 (1); Kelsey Mill 1961 (1)
Nevada	49'er 1988 (5); Lobo 2017 (1); North San Juan 1960 (2); Snow Tent 1955 (1); Camp Beale 1951 (1)
Placer	River 2021 (1); Animal 1979 (1)

Of the 30 burned parcels, 11 burned in the last eleven years (Butte, Caldor, Lobo, River). The other 19 last burned before 1997, and most of those before 1980. Half of Calaveras's burned parcels are 2015 Butte Fire lots, which is where the structure-loss and debris questions above apply most directly. Nevada's five 49'er parcels burned 38 years ago and are, for fuel purposes, ordinary foothill land.

How to check a specific parcel

Fire history. CAL FIRE publishes the perimeter layer through its FRAP data portal and as a map viewer. Search by location, turn on the fire perimeters layer, and read the fire name and year from the polygon. Note that a parcel on the edge of a perimeter may have burned only in part.

Hazard zone. OSFM publishes the SRA and LRA maps through its FHSZ viewer, searchable by address or by clicking a location. For an LRA rating, check whether the city or county has adopted the 2025 recommendation by ordinance; until it has, the older Very-High-only map governs.

Both at once. Our Fire Check takes a parcel or a location and returns both layers side by side — every recorded perimeter touching it with the year, and the FHSZ rating with its responsibility area. It reads the same CAL FIRE and OSFM sources described above, so it is a faster route to the same answer, not a different one.

What neither layer shows. Neither map records defensible-space inspection results, whether a structure on the roll still stands, or what the insurance market will do. For a parcel with improvement value, look at recent aerial imagery and, if you can, drive it. For any parcel you intend to build on, call the county building department and ask what Chapter 7A and the local fire code will require before you assume a price.

What this changes about a bid

Nothing in the fire data tells you a parcel is a bad purchase. Plenty of Very High land in these counties is exactly what buyers want: forested, private, sloped. What the data does is change the costs you should carry:

• A build on Very High land costs more (Chapter 7A) and takes longer (defensible-space and, in some counties, fire-agency sign-off before a permit).
• A resale on Very High land requires disclosure and, for a home, an inspection record.
• Insurance may be FAIR Plan only, with the premium and coverage limits that implies.
• A recent burn scar may carry cleanup obligations and will carry the regrowth fuel load for another decade.

Put those into the price. The research checklist has the rest of the due-diligence order, and why parcels go unsold shows what past bidders have done with parcels like these.

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This article describes public map layers and California law as of September 2026 and is not legal, insurance or investment advice. Map layers are updated and local ordinances vary; confirm the current rating with the State Fire Marshal and the local fire agency before relying on it.