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2025 Annual Fire Report

Fires in Lake Oswego, Oregon

In 2025, fire departments serving Lake Oswego responded to 206 fire and hazmat incidents — from cooking fires to gas leaks to a single $700K building blaze. Here's the full picture.

Updated Sep 27, 2026 Grade B+ Peak yr 2024 Clackamas County 40,457 residents 0 reporting departments 1,088 5-yr
Total incidents
206
-41.5% vs 2024
Building fires
30
Residential 67% Other 33%
Property loss
$4.0M
$2.9M structure · $1.1M contents
Deaths & injuries
1 / 3
1 civilian deaths · 1 civ injuries · 2 firefighter injuries
01 The mix

What kinds of fires happen here?

Building fires lead by count. Building fires lead by dollars. Together the top five categories make up about 57% of all calls.

206
Total Incidents
Building fires 30 14.6%
Gas leak (natural gas or LPG) 29 14.1%
Building or structure weakened or collapsed 25 12.1%
Brush, or brush and grass mixture fire 22 10.7%
Unauthorized burning 12 5.8%
All other categories 88 42.7%
02 Seasonality

When do fires happen?

Feb peaks. Apr dips. Watch for the typical fall climb starting in October.

Jan 13
Feb 23
Mar 12
Apr 10
May 18
Jun 16
Jul 22
Aug 20
Sep 16
Oct 18
Nov 15
Dec 23
Fewer
More
2b Five-year trend

Year over year in Lake Oswego

1,088 incidents 2021–2025. Peak year was 2024. $4.8M cumulative property loss. 1 civilian deaths.

YearIncidentsYoY 
2021 254 —
2022 193 -24.0%
2023* 83 —
2024 352 —
2025 206 -41.5%

* Well below Lake Oswego's usual volume. That almost always means one or more departments didn't submit a full year to NFIRS, not that fires dropped, so no year-over-year change is shown for it.

03 Cause of ignition

What sparks building fires?

For the 30 building fires Lake Oswego departments responded to in 2025, here's how they were classified once investigators were finished.

Unintentional
42%
27
Cause undetermined
33%
21
Intentional / arson
8%
5
Equipment / heat source failure
8%
5
Under investigation
8%
5
Act of nature (lightning)
1%
0
3b Where fires start

Where do fires start in Lake Oswego?

NFIRS Area of Origin (AREA_ORIG) for the 152 building fires investigators classified across 2021–2025. The room or location where ignition occurred — kitchens, bedrooms, exterior, vehicle areas — tells you where to focus prevention.

#Area of originCountShare 
1 Engine area, running gear, wheel area 22 14.5%
2 Highway, parking lot, street: on or near 22 14.5%
3 Open area - outside; included are farmland, field 18 11.8%
4 Outside area, other 14 9.2%
5 Undetermined 13 8.6%
6 Courtyard, patio, porch, terrace 8 5.3%
7 Cooking area, kitchen 7 4.6%
8 Chute/container - trash, rubbish, waste 6 3.9%
9 Vehicle storage area; garage, carport 5 3.3%
10 Common room, den, family room, living room, lounge 4 2.6%
11 All other areas 33 21.7%
3c What ignited it

What actually ignited the fire?

NFIRS Heat Source (HEAT_SOURC) — the physical thing that started it. Spark or ember from operating equipment, an open flame, smoking materials, or hot embers from a fireplace are the leading culprits nationwide. Here's the Lake Oswego mix.

#Heat sourceCountShare 
1 Undetermined 83 54.6%
2 Cigarette 10 6.6%
3 Radiated, conducted heat from operating equipment 9 5.9%
4 Hot ember or ash 8 5.3%
5 Heat from powered equipment, other 7 4.6%
6 Hot or smoldering object, other 6 3.9%
7 Arcing 5 3.3%
8 Heat from other open flame or smoking materials 5 3.3%
9 Chemical reaction 4 2.6%
10 Heat source: other 3 2.0%
11 All other sources 12 7.9%
04 The biggest fires

8 fires · $2.7M in losses

Largest single-incident property losses reported by Lake Oswego departments in 2025. These 8 fires alone account for 95% of the city's annual total.

# Property loss Type Severity Status
1 $700,000 Building fires Major Investigated
2 $600,000 Building fires Major Investigated
3 $579,866 Building fires Major Investigated
4 $337,010 Building fires Major Investigated
5 $296,806 Building fires Major Investigated
6 $150,000 Building fires Significant Investigated
7 $65,000 Off-road vehicle or heavy equipment fire Significant Investigated
8 $20,436 Passenger vehicle fire Significant Investigated
05 How Lake Oswego compares

Lake Oswego vs Oregon vs the nation

Per-capita rates let us compare apples to apples. Lake Oswego sits below the national average for incidents per resident.

5.09
Incidents per 1,000 residents
Lake Oswego
5.09
OR avg
8.47
US avg
7.48
0.74
Building fires per 1,000 residents
Lake Oswego
0.74
OR avg
0.83
US avg
0.85
24.7
Civilian fire deaths per million
Lake Oswego
24.7
OR avg
3.8
US avg
5.9
5b Who gets hurt

Casualty demographics in Lake Oswego

9 fire-related casualties recorded in NFIRS Module 11 across the 2021–2025 window. Age, gender, and severity are coarse-binned — no individual identification possible.

AgeCount 
0-9 0
10-19 1
20-29 1
30-39 1
40-49 3
50-59 3
60-69 0
70-79 0
80+ 0
Civilian vs firefighter
Civilian 5 FF 4
Gender
M 8 F 1 Unk 0
Severity (1=minor → 5=fatal)
2
1
3
2
0
3
2
4
2
5
5c Wildfires nearby

Wildfires within 50 mi of Lake Oswego

Top 25 wildfires (1992+) in the FPA-FOD ignitions database, scaled by acres. 457,634 acres burned in this 50-mile radius. Each dot is a fire — bigger dots burned more land.

50 mi radius
YearCauseAcresDistance 
2020 Missing data/not specified/undetermined 193,573 47.9 mi
2020 Missing data/not specified/undetermined 138,054 39.9 mi
2017 Fireworks 48,488 41.4 mi
2020 Missing data/not specified/undetermined 24,995 49.7 mi
1992 Smoking 24,400 41.0 mi
2001 Natural 7,500 9.8 mi
2014 Missing data/not specified/undetermined 5,508 29.4 mi
2010 Natural 2,810 49.4 mi
2020 Missing data/not specified/undetermined 2,584 16.4 mi
2011 Natural 2,033 48.2 mi
2020 Missing data/not specified/undetermined 1,508 16.4 mi
2000 Missing data/not specified/undetermined 1,000 44.2 mi
5d Top ZIPs

Where in Lake Oswego do fires concentrate?

Top 8 ZIP codes by NFIRS incident count across 2021–2025. Each ZIP has its own fire profile — dive in for neighborhood-level context.

#ZIP5-yr incidents 
1 97035 587
2 97034 493
3 97219 2
4 97022 1
5 97036 1
6 97045 1
7 97223 1
8 97224 1
5e Peer cities

Cities similar to Lake Oswego

Six Oregon cities with population within ±25% of Lake Oswego. Useful comparison targets — same state, similar size, different fire profile.

07 Stay prepared

Before the next Red Flag day.

A 30-minute weekend can cut your home's exposure substantially. These four checklists are a good starting point.

About this data

Numbers reflect incidents reported by participating fire departments to the National Fire Incident Reporting System (NFIRS) Public Data Release for calendar year 2025. NFIRS is voluntary — about 23,000 of roughly 30,000 US fire departments report — so totals are a strong indicator, not a complete census. Per-capita comparisons use 2023 ACS population estimates. Wildland fire data complements NFIRS with NIFC and USFS perimeters. Active-fire counts come from a dated NIFC snapshot, not a live feed.