Wildfire risk in Mariposa County: where it is highest, and why
Wildfire risk in Mariposa County spans a wide range across the places we scored. The overall scores run from 41.4 near Mariposa to 82.2 near Greeley Hill, with a county middle point of 70.0.
Mariposa County — the largest fires on record, at their perimeter centres, with the county’s main communities. Select a marker for its detail.
At a glance
Half of Mariposa County scores High or worse
We scored 155 points across Mariposa County on the same 0–100 scale a Satelife address report uses, and they do not land in one place. 26% of them come out Very High, while 5% are Moderate. Which end your own parcel sits at is not something a county map can tell you.
26%
69%
Very High26% · 41 of 155 pointsHigh69% · 107 of 155 pointsModerate5% · 7 of 155 points
Safest end we measured41.4near Mariposa · Moderate
Middle of the county70High — half of Mariposa County is above this
Most exposed end we measured82.2near Greeley Hill · Very High
And the federal models agree it is a fire county
Relatively HighFEMA National Risk Index — wildfire risk rating · index score 99 / 100
$15.4M / yrFEMA NRI — expected annual loss from wildfire · rated Relatively High
1.07%USFS Wildfire Risk to Communities — mean annual burn probability · 90th-percentile cell 2.33%
4.86 ftUSFS WRC — mean conditional flame length · 99% of the county carries burnable fuel
FEMA NRI also rates Mariposa County: all-hazards risk Relatively Moderate · social vulnerability Very High · community resilience Relatively Low · annualised wildfire frequency 0.0156.
Sources: FEMA National Risk Index 1.20.0 (Dec 2025), county record · USFS Wildfire Risk to Communities v2.0, mean of the grid cells inside the county. Both describe the county as a whole, never an address in it.
What does your Mariposa County address score?
A county range shows the spread. Your parcel sits somewhere inside it — the report says where, and what to do about it.
Free to request · PDF report with a 0–100 score, the drivers behind it, and a mitigation plan
Local context
What the data says about Mariposa County
Most scored locations fall in the High tier. Counts are 107 High, 41 Very High, and 7 Moderate, with no Low points.
Fire history is a major part of the county picture. Since 1984, 571,447 acres have burned, which is 61.4% of the county.
Fire record
Where the fires actually were
Recorded fire activity is extensive in Mariposa County: 464 fire perimeters since 1984, covering 571,447 acres in total.
In this county view, the largest named fire is Ferguson (2018), at 97,729 acres. The Rim fire (2013) was larger overall at 256,916 acres and was partly in the county.
The most recent large fire is Waltz (2026). Other major events in the county record include Detwiler (2017) at 81,826 acres and Oak (2022) at 19,245 acres.
Ferguson Fire, 2018 — Mariposa County.
Photo: Region 5 Photography · CC BY 2.0Detwiler Fire, 2017 — Mariposa County.
Photo: blmcalifornia · Public domain
464mapped fire perimeters centred in the county since 1984
571,447acres inside those perimeters since 1984
61.4%of the county's area, as a share of 3,766.1 km²
Waltz 2026most recent large fire on record
Before 20002000s2010s2020s
Fire perimeters coloured by decade. Select a perimeter for its name, year and size.
Named fires on record
Ferguson Fire201897,729 acres
Detwiler Fire201781,826 acres
Telegraph Fire200834,084 acres
Oak Fire202219,245 acres
Rim Fire2013256,916 acres in totalcrossed into the county
Larson Fire198748,087 acres
Hamm Fire198733,144 acres
Red Fire20228,432 acres
Perimeter sources: NIFC Interagency Fire Perimeter History · WFIGS Interagency Perimeters · largest on record: Ferguson 2018.
Perimeters are simplified for display; acreage is the figure the source records.
Communities
Where in the county you are matters most
Among named communities, Yosemite Village has a scored middle value of 74.9, Mariposa is 73.8, and Greeley Hill is 72.3.
Fish Camp is 72.1 and Curry Village is 71.8. All of these are above the county middle value of 70.0, so these community-level readings sit on the higher side of the county distribution.
Yosemite Villagevillage
74.9 High
Mariposavillage
73.8 High
Greeley Hillvillage
72.3 High
Fish Campvillage
72.1 High
Curry Villagevillage
71.8 High
The score is the median of the sampled points nearest that community — a community-scale
indicator, not a score for any individual property in it. Population comes from the
community's own record where the source carries one.
Terrain & fuels
Terrain, vegetation and fuels
Terrain contributes differently by location, from 30.0 near Curry Village to 65.0 near Mariposa, with a middle value of 55.0.
Vegetation and fuels are mostly on the higher side in the places we scored. Values run from 40.0 at Mariposa to 80.0 near Mariposa, with a middle value of 72.6.
Taken together, steeper terrain and heavier fuels are associated with higher wildfire risk in several parts of the county, especially where both are elevated.
55median terrain score (max 65 near Mariposa)
72.6median vegetation & fuels score (max 80 near Mariposa)
Fire weather
Fire weather across Mariposa County
Fire-weather scores were measured across Mariposa County and are tightly grouped. They range from 54.5 near Yosemite Village to 56.2 near Mariposa, with a middle value of 55.8.
Because this spread is small, fire weather contributes at a fairly similar level across the county compared with other factors that swing more from place to place.
54.5lowest fire-weather score — near Yosemite Village
56.2highest fire-weather score — near Mariposa
What drives it
Which part of the risk moves, and which doesn't
Risk is not uniform from one part of the county to another. The lowest overall score, 41.4, is near Mariposa, while the highest, 82.2, is near Greeley Hill.
Hazard-zone scores also vary sharply by location, from 10.0 near Curry Village to 93.6 near Greeley Hill. That spread contributes to why nearby places can land in different risk tiers.
Fire-history scores are generally high in this county, with a middle value of 90.0 and a top value of 95.0 at Mariposa. At the low end, one scored location near Mariposa is 5.0, showing that past-fire exposure is very uneven across the county.
Each bar is what one part of the score covers across Mariposa County, on the same 0–100 scale.
A long bar is a part of the risk that depends on where you are; a short one is the same
almost everywhere.
Terrain
30–65highest near Mariposa
Vegetation & fuels
40–80highest near Mariposa
Hazard zone
10–93.6highest near Greeley Hill
Fire history
5–95highest near Mariposa
Fire weather
54.5–56.2highest near Mariposa
Overall score
41.4–82.2highest near Greeley Hill
The tick on each bar is the middle value. Tier boundaries — Moderate at 25, High at 50,
Very High at 75 — are the faint lines behind them.
Show every number behind these bars
Layer
Min
Median
Max
Lowest place
Highest place
Points
Terrain
30
55
65
near Curry Village
near Mariposa
155
Vegetation & fuels
40
72.6
80
Mariposa
near Mariposa
155
Hazard zone
10
70
93.6
near Curry Village
near Greeley Hill
155
Fire history
5
90
95
near Mariposa
Mariposa
155
Fire weather
54.5
55.8
56.2
near Yosemite Village
near Mariposa
155
Composite
41.4
70
82.2
near Mariposa
near Greeley Hill
155
Independently of Satelife's layers, the USFS Wildfire Risk to Communities grid puts the county's mean annual burn probability at 1.07% (90th percentile cell: 2.33%), with a mean conditional flame length of 4.86 ft. 99% of the 19,766 grid cells inside the county carry burnable fuel at all.
Source: USFS Wildfire Risk to Communities v2.0 (ImageServer, county extent).
CAL FIRE has no mapped Fire Hazard Severity Zone at 75 of the 155 sampled points — the zones cover Local Responsibility Areas. At 74 of them the USFS grid above supplied the hazard reading instead; at the remaining 1 the hazard weight is renormalised away rather than scored as low.
155 sample points on a ~2.3 km grid, plus one at the centre of each community, weighted with the Satelife county profile v1 · median layer coverage 100%. Scores are 0–100 and comparable within the county, not across states.
For a property
What a county range means for one address
FEMA’s National Risk Index rates Mariposa County’s wildfire risk as Relatively High, and its wildfire expected annual loss as Relatively High. FEMA also rates county social vulnerability as Very High and community resilience as Relatively Low.
The USFS Wildfire Risk to Communities model reports a mean annual burn probability of 1.07% and a 90th-percentile cell burn probability of 2.33%. It also indicates 98.9% of the county can burn.
Individual home features were not measured on this county page (for example, specific roof or vent details at a given address). What is measured here is place-based wildfire risk across the county.
Across 155 sampled points in Mariposa County, the score runs from
41.4 to 82.2 — two neighbouring parcels can sit in different tiers.
A county number is the middle of that spread; it says nothing about which end yours is at.
Find out where your Mariposa County parcel sits
Slope, the fuel touching the structure, the road out, the fire history within a mile — measured at your address, not averaged across the county.
Free to request · PDF report with a 0–100 score, the drivers behind it, and a mitigation plan
Coverage
ZIP codes we cover in Mariposa County
Every one of the 17 ZIP areas that touch Mariposa County — we run address-level
reports in all of them. They are grouped by the median score of the points we sampled inside
each, which is a neighbourhood-scale indicator and not a score for any
property: two homes in the same ZIP routinely land in different tiers.
Frequently asked questions about Mariposa County wildfire risk
Does most of Mariposa County score High or Very High?
Most scored locations are in the High tier (107 points), with another 41 in Very High. Only 7 points are Moderate, and none are Low.
What is the latest large fire to know about here?
The most recent large fire is Waltz (2026). The largest named fire in this county view is Ferguson (2018), at 97,729 acres.
How much of the county has burned since 1984?
A total of 571,447 acres has burned since 1984, equal to 61.4% of Mariposa County.
Are FEMA ratings neighborhood-specific?
No. FEMA’s National Risk Index ratings shown here apply to Mariposa County as a whole, not to individual towns or blocks.
Is fire weather very different across the county?
In these scores, fire weather is fairly consistent: 54.5 to 56.2 across the county’s scored locations.
This page is generated from a Mariposa County data pack assembled on 2026-08-18 (pack v1.0). Scores are sampled across the
county, not measured at any individual address, and are informational decision support — not a
substitute for official evacuation orders, a fire-agency hazard determination, or an insurer's
underwriting judgement.
Data versions: fema_nri 1.20.0 (Dec 2025) · landfire per adapter · nifc_history All Years View · wfigs current · wrc v2.0 (2024) · zcta Census 2020.
What does your parcel look like, layer by layer?
A county range shows the spread. An address-level Satelife report shows where in that spread your property actually sits — PDF, per-layer score, and a prioritized mitigation plan.
