Every year, Canadians watch as thousands of wildfires burn across forests, grasslands, wetlands, and rural communities from British Columbia to Newfoundland and Labrador. While wildfire has always been a natural part of Canada’s landscape, recent years have demonstrated just how devastating these events can become.

Entire communities have been evacuated, homes have been destroyed, wildlife habitats have been altered, and millions of Canadians have experienced hazardous smoke conditions hundreds or even thousands of kilometres away from the flames.

Wildfires are no longer a concern only for people living deep in the forest. They affect farmers, rural property owners, cottage owners, Indigenous communities, cities, businesses, transportation, tourism, health care, and Canada’s economy as a whole.

Understanding why wildfires occur, how they spread, and what Canadians can do to reduce their risk is becoming increasingly important.

I currently view a visual map of the smoke and fire on The Weather Network.

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What Is a Wildfire?

A wildfire is an uncontrolled fire that burns vegetation such as:

• Forests
• Grasslands
• Bush
• Wetlands
• Peatlands
• Agricultural land

Wildfires may burn for only a few hours or continue for several months depending on weather conditions, available fuel, terrain, and firefighting resources.

Canada experiences one of the largest wildfire seasons in the world, with fire activity typically beginning in April and continuing into October, although northern fires may burn much longer. Fire is also a natural ecological process that helps regenerate many Canadian forests, but severe fire seasons can threaten lives, infrastructure, and ecosystems.

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How Common Are Wildfires in Canada?

On average Canada experiences:

• Thousands of individual wildfires every year
• Millions of hectares burned annually
• Hundreds of community evacuations during severe seasons
• Billions of dollars in economic losses during major fire years

Most fires occur in:

• British Columbia
• Alberta
• Saskatchewan
• Manitoba
• Ontario
• Northwest Territories
• Yukon

Although eastern Canada experiences fewer large fires, every province has wildfire risk.

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What Causes Canadian Wildfires?

Wildfires generally begin from two primary sources.

1. Lightning

Lightning is responsible for many of Canada’s largest wildfires.

A single lightning strike can ignite:

• Dry grass
• Dead trees
• Forest litter
• Peat moss
• Fallen branches

Lightning-caused fires often occur in remote areas where they may burn unnoticed before being discovered.

These fires account for most of the land burned each year.

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2. Human Activity

Human-caused fires account for a significant portion of wildfire starts.

Common causes include:

• Unattended campfires
• Discarded cigarettes
• Sparks from ATVs
• Equipment failures
• Agricultural burning
• Railways
• Power lines
• Fireworks
• Burning brush piles
• Chainsaws
• Welding equipment

Many of these fires occur close to populated areas where homes and businesses are at greatest risk.

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Conditions That Make Fires Worse

Wildfires require three ingredients:

• Fuel
• Heat
• Oxygen

Several environmental factors determine how rapidly they spread.

Dry Vegetation

Dead grass and leaves ignite quickly.

Long periods without rainfall dramatically increase fire danger.

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Wind

Wind is one of the biggest contributors to fire growth.

Strong winds:

• Carry burning embers
• Increase oxygen supply
• Push flames uphill
• Create spot fires kilometres ahead of the main fire

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High Temperatures

Hot weather dries vegetation and lowers moisture levels.

Heat waves significantly increase wildfire risk.

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Low Humidity

Dry air removes moisture from plants and forest debris.

Even healthy vegetation becomes more flammable during prolonged dry periods.

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Drought

Extended drought conditions can allow fires to burn:

• Underground
• Through peat
• For weeks or months

Some fires survive winter beneath the snow and reappear the following spring.

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The Role of Climate Change

Scientists have observed that climate change is increasing wildfire risk across many parts of Canada by contributing to:

• Longer fire seasons
• More frequent heat waves
• Earlier snowmelt
• Lower soil moisture
• More severe droughts
• Increased lightning activity in some regions

These conditions create larger areas of dry vegetation capable of sustaining intense fires.

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Types of Wildfires

Ground Fires

These burn beneath the surface.

They consume:

• Roots
• Peat
• Organic soils

Ground fires are difficult to extinguish.

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Surface Fires

The most common wildfire type.

They burn:

• Grass
• Shrubs
• Fallen branches
• Forest floor debris

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Crown Fires

The most dangerous.

These fires spread through tree canopies.

They move rapidly and produce enormous amounts of heat.

Entire forests may become engulfed within minutes.

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How Wildfires Spread

Fire spreads through several methods.

Direct Flame Contact

Flames ignite nearby vegetation.

Radiant Heat

Intense heat causes nearby fuels to ignite before flames reach them.

Flying Embers

Perhaps the greatest threat to homes.

Burning embers can travel hundreds of metres—or even kilometres in strong winds—and ignite roofs, decks, fences, mulch, or dry vegetation. Research shows that many homes lost during wildfires ignite from embers rather than from a direct wall of flame. FireSmart Canada focuses heavily on reducing this ember risk.

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Effects on People

Wildfires affect people in numerous ways.

Loss of Homes

Entire neighbourhoods can be destroyed.

Many families lose:

• Houses
• Vehicles
• Farms
• Livestock
• Personal possessions

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Evacuations

Communities may receive evacuation alerts with little notice.

Families often leave with only essential belongings.

Some remain displaced for weeks or months.

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Health Effects

Smoke contains harmful pollutants.

Exposure may cause:

• Coughing
• Eye irritation
• Headaches
• Asthma attacks
• Difficulty breathing
• Heart complications
• Reduced lung function

Children, seniors, pregnant women, and those with existing heart or lung conditions are particularly vulnerable.

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Financial Stress

Many families experience:

• Insurance claims
• Lost income
• Temporary housing expenses
• Business closures
• Property repairs

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Emotional Effects

Wildfires can leave lasting psychological impacts.

Many people experience:

• Anxiety
• Depression
• Fear
• Grief
• Anger
• Uncertainty
• Survivor’s guilt

Children may struggle after evacuations or losing familiar surroundings.

Farm families often experience emotional trauma from livestock losses and uncertainty about rebuilding.

Recovery can take years.

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Effects on Wildlife

Wildfires dramatically affect wildlife.

Animals may:

• Lose habitat
• Be displaced
• Suffer injuries
• Experience food shortages

Species commonly affected include:

• Moose
• Deer
• Bears
• Wolves
• Birds
• Amphibians
• Small mammals

Many animals escape advancing fires, but some cannot.

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Effects on Forests

Although destructive, wildfire is also a natural part of Canadian forests.

Benefits include:

• Recycling nutrients
• Opening forest canopies
• Encouraging new plant growth
• Creating habitat diversity
• Reducing accumulated dead vegetation

Some tree species, such as jack pine, actually depend on fire to release seeds.

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Effects on Water

After fires:

• Soil becomes unstable
• Ash enters waterways
• Sediment increases
• Fish habitat may be damaged

Heavy rain following a wildfire often causes erosion and flooding.

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Effects on Air Quality

Smoke from western Canadian fires frequently travels across the country and even into the United States and Europe.

Smoke contains:

• Fine particulate matter (PM2.5)
• Carbon monoxide
• Volatile organic compounds
• Nitrogen oxides

Air quality advisories may remain in effect for days or weeks.

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Economic Effects

Wildfires cost Canada billions of dollars through:

• Firefighting operations
• Infrastructure damage
• Lost timber
• Agricultural losses
• Tourism impacts
• Health care costs
• Insurance claims
• Transportation disruptions

Roads, railways, power lines, pipelines, and communications infrastructure can all be affected.

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How Canadians Can Help Prevent Wildfires

Many wildfires are preventable.

Simple actions make a difference.

Maintain Your Property

Remove:

• Dead branches
• Dry grass
• Fallen leaves
• Brush piles

Keep vegetation trimmed around buildings.

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Build a FireSmart Property

FireSmart recommendations include:

• Non-combustible roofing
• Gravel landscaping near buildings
• Fire-resistant plants
• Clean gutters
• Store firewood away from structures
• Screen attic vents to reduce ember entry

These measures can greatly improve a home’s chances of surviving a wildfire.

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Follow Fire Bans

Never ignore:

• Municipal burn bans
• Provincial restrictions
• Park regulations

Restrictions exist because conditions can change rapidly.

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Be Careful With Equipment

Avoid creating sparks when conditions are dry.

Inspect:

• Chains
• Bearings
• Exhaust systems

Carry fire extinguishers during field work.

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Fully Extinguish Campfires

Before leaving:

• Stir ashes
• Add water
• Stir again
• Repeat until cold

If it is too hot to touch, it is too hot to leave.

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Preparing for Wildfire Season

Every household should have:

• Emergency kit
• Three-day supply of food and water
• Medications
• Flashlights
• Battery-powered radio
• Important documents
• Pet supplies
• Phone chargers
• Fuelled vehicle

Know multiple evacuation routes and stay informed through official alerts.

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Recovery After a Wildfire

Recovery involves more than rebuilding homes.

Communities often require:

• Mental health support
• Financial assistance
• Environmental restoration
• Infrastructure repairs
• Wildlife rehabilitation
• Economic recovery

Forests themselves may take decades to fully regenerate.

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Where Canadians Can Find Reliable Wildfire Information

For accurate information, maps, preparedness advice, and assistance, rely on official sources:

• Canadian Wildland Fire Information System (CWFIS) — Interactive wildfire maps, fire danger ratings, smoke information, and national wildfire updates.
• FireSmart Canada — Practical guidance for homeowners, communities, and businesses to reduce wildfire risk.
• Government of Canada – Wildfire Preparedness — Emergency planning, evacuation guidance, preparedness information, and links to current federal initiatives.
• Canadian Red Cross – Wildfires — Information on preparing for wildfires, disaster recovery, emergency assistance, and support for affected Canadians.
• Indigenous Services Canada – FireSmart Program — FireSmart funding and emergency management support for eligible First Nations communities.

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Final Thoughts

Wildfires have always shaped Canada’s forests, but their growing frequency and intensity are changing how Canadians live, work, and prepare for the future. While no one can prevent lightning or control the weather, individuals, communities, and governments all have a role in reducing wildfire risk.

By understanding how fires start, maintaining FireSmart properties, following fire restrictions, preparing emergency plans, and staying informed through trusted sources, Canadians can better protect their families, homes, and communities. At the same time, supporting those affected—whether through volunteering, donations, or simply checking in on neighbours—helps communities recover long after the flames have been extinguished. As wildfire seasons continue to evolve, preparedness, resilience, and cooperation remain Canada’s strongest defences.