Wildfires can move faster and more unpredictably than almost any other natural disaster, often turning a distant plume of smoke into an evacuation order within hours. Having a plan in place before fire season arrives, rather than figuring one out as smoke fills the sky, is what gives your household the best chance of getting out safely and returning to as little damage as possible.

What Is a Wildfire?

A wildfire — also known as a forest fire or brush fire, depending on the type of vegetation involved —  is an uncontrolled fire that spreads through vegetation such as grass, brush, or forest, often fueled by dry conditions, wind, and available fuel like dead leaves and fallen branches. Most wildfires are started by people through unattended campfires, sparks from equipment or vehicles, downed or arcing power lines, and, less commonly, arson; the remainder of wildfires start naturally, typically from lightning strikes hitting dry vegetation. 

Once ignited, unlike a structure fire, wildfires can spread across huge areas quickly, especially when strong winds carry burning embers well ahead of the main fire line, igniting new spot fires far from where the fire started. This is part of what makes wildfires so dangerous: the fire itself can arrive somewhere before any visible flame does, simply by way of wind-blown embers landing on dry fuel.

Where Are Wildfires Most Common?

Wildfire risk is highest in areas with a combination of dry vegetation, low humidity, and strong seasonal winds. In the U.S., California, Oregon, Washington, and much of the broader Southwest see frequent, often severe wildfire activity, driven by long dry seasons and, in California especially, strong offshore winds that can push fires rapidly toward populated areas. The Rocky Mountain states and parts of Texas also see substantial wildfire risk, particularly in areas where homes sit close to wildland vegetation. While wildfire season traditionally peaks in the summer and fall, prolonged drought conditions have made destructive fires possible in nearly any season in the highest-risk regions.

What Is a Fire Weather Warning?

The National Weather Service uses two related terms when it comes to warning about conditions that could lead to fires, and the distinction matters:

• Fire Weather Watch: This warning alerts to a high potential for dangerous fire weather conditions developing within the next 12 to 72 hours. A watch is your signal to start paying closer attention and get ahead of preparations, since conditions haven't arrived yet but are trending that way.

• Red Flag Warning: These are issued when there's high confidence that dangerous fire weather conditions will occur within the next 24 to 48 hours, or when those conditions are already happening. It's a warning about weather conditions that raise fire risk, not a notice of an active fire itself, and it may cover an entire fire weather zone or just portions of one. 

Red Flag Warnings are typically driven by a combination of strong, gusty winds, low humidity, and dry fuels — for example, frequent wind gusts of 25 mph or greater combined with relative humidity at 15% or below, sustained for at least 3 hours within a 12-hour period. Dry thunderstorms, sudden wind shifts from a frontal passage, or humidity that fails to recover overnight can also factor in. This is the more urgent alert, and it means any spark, however small, could quickly turn into a fast-moving, hard-to-control fire.

What to do when a Red Flag Warning is issued:

• Avoid any activity that could create a spark, including grilling, using power tools outdoors, or debris burning

• Review your evacuation routes and confirm your go-bag is packed and accessible

• Keep an eye on local news, Watch Duty, or your area's emergency alert system for updates

• Close windows and vents to limit embers from entering your home if conditions worsen

• Avoid parking vehicles on dry grass, since a hot exhaust system can ignite it

A fire weather watch or red flag warning doesn't mean a fire has started — it means conditions are lined up for one to spread quickly if it does. Treating that window seriously is one of the simplest ways to reduce risk before fire season peaks.

How to Prepare for a Wildfire

Wildfire preparation happens largely around your home itself, since the choices you make about landscaping and construction materials can significantly affect whether your property survives a nearby fire.

Create defensible space. Defensible space is a cleared buffer zone around your home designed to slow or stop a wildfire's spread before it reaches your house. In California, Cal Fire requires 100 feet of defensible space, and it's a good benchmark anywhere with wildfire risk. That 100 feet of defensible space is broken into three zones: 0 to 5 feet of noncombustible ground immediately around the structure, 5 to 30 feet of lean, well-maintained landscaping, and 30 to 100 feet of reduced vegetation and fuel.

Harden your home against embers. Embers, not direct flame contact, cause the majority of wildfire home losses, since they can travel well ahead of a fire and ignite anything flammable they land on. Install 1/8-inch mesh screens over vents to keep embers from entering your attic or crawl space, clear roof gutters and roof valleys of leaves and debris, remove combustible materials from within 5 feet of your house, and close all windows during fire weather. Class A fire-rated roofing materials offer significantly better protection than untreated wood shakes or shingles.

Pack a wildfire go-bag. Your go-bag is the portable version of your wildfire emergency kit, and should include N95 masks, safety goggles, cotton bandanas, long sleeves and pants made of cotton rather than synthetic fabric (which can melt against skin), sturdy shoes, water, emergency food bars, medications, important documents, cash, a flashlight, and your vehicle keys. Keep it somewhere easy to grab quickly, since wildfire evacuations often move faster than other disaster types.

Plan your evacuation routes in advance. Identify at least two, ideally three, evacuation routes out of your area, since a single fire can block one route entirely depending on wind direction and fire spread. Sign up for local emergency alerts, including Wireless Emergency Alerts (WEA) and systems like Nixle or CodeRED, so you're notified as early as possible if evacuation becomes necessary. The app Watch Duty is also a great resource for up-to-date information on current fires, including maps, evacuation orders, acreage affected, and notifications on actions being taken to fight the fire.

Wildfire Evacuation Checklist

Use this wildfire evacuation checklist to make sure nothing gets missed once a fire is close enough that every minute counts.

• Go-bag packed and easy to grab

• At least two evacuation routes mapped out

• Local emergency alerts enabled (WEA, Nixle, or CodeRED)

• Defensible space cleared and maintained

• Important documents ready to take with you

• Vehicle fueled and ready to go

• N95 masks on hand for you and your household

When and How to Evacuate

Evacuate immediately once your zone receives an evacuation order or warning — don't wait to be told twice, and don't wait to see how the fire develops before deciding. Wildfires can spread faster than most people expect, and roads that were clear an hour ago can become impassable or dangerously smoke-filled with little notice.

Grab your go-bag and leave early, before roads close and reduced visibility from smoke makes driving more hazardous. If you're unsure whether your area is at risk, check your evacuation zone status. 

What to Do During a Wildfire

If you're evacuating, follow your planned route and listen for updated instructions along the way, since conditions can shift quickly. Keep car windows closed and, if smoke is heavy, set your vehicle's air system to recirculate to limit smoke entering the cabin.

If you find yourself trapped and unable to evacuate, your best chance to survive a wildfire is to wear an N95 mask, stay low to the ground where air is less smoke-filled, and look for water, rocky ground, or an area that has already burned, since these locations offer some protection from approaching flame. Avoid dense vegetation, canyons, and areas with heavy fuel load, which can burn intensely and unpredictably.

The Danger of Wildfire Smoke

Smoke is often the most far-reaching hazard of a wildfire, capable of affecting air quality hundreds of miles from the fire itself. Wildfire smoke contains fine particulates, including PM2.5, small enough to penetrate deep into the lungs and even enter the bloodstream, posing a real risk to respiratory and cardiovascular health, especially for children, older adults, and anyone with existing heart or lung conditions.

To protect yourself from wildfire smoke outdoors, a NIOSH-certified N95 respirator is the standard recommendation, since it filters out roughly 95% of airborne particulates. Surgical masks and cloth masks, by contrast, do not offer meaningful protection against smoke, regardless of how well they fit. For an N95 to work as intended, it needs to fit tightly against your nose and mouth with no gaps, so take the time to adjust it properly rather than just placing it over your face.

Indoors, keep windows and doors closed and set your HVAC system to recirculate air rather than pulling in air from outside. A portable air purifier with a HEPA filter can further reduce indoor particulate levels if smoke is heavy or lingering in your area, and running one in a bedroom or main living space overnight makes a noticeable difference when air quality stays poor for multiple days.

What to Do After a Wildfire

Don't return home until local authorities confirm it's safe to do so, even if the visible fire and heavy smoke appear to have cleared. Downed power lines, weakened trees, hot spots, and unstable structures can all pose a danger well after the flames themselves are gone. Once you're cleared to return, check your property carefully for smoldering debris or hidden hot spots before assuming the danger has fully passed, and continue monitoring air quality, since smoke can linger in an area for days after a fire is contained.

If your home was damaged, document everything with photos before beginning any cleanup, both for your own records and for any insurance claims. Continue wearing an N95 mask during cleanup if smoke or ash is still present, since disturbed ash can release particulates back into the air.

Preparation Is What Buys You Time

Wildfires don't leave much room for last-minute decisions, which is exactly why the wildfire safety tips described here matters so much. Defensible space, a hardened home, a packed go-bag, and pre-planned evacuation routes won't stop a wildfire from happening, but they give your household the best possible chance of evacuating safely and coming back to as little damage as possible.

For more guidance, visit our Wildfires FAQs page for answers to common wildfire-related questions.