BIG GRASS Fire — Latest News & Live Update
Malheur County, OR
FireRisk.ai · Updated August 10, 2026
🔺 Fire grew 36,694 acres since the last report — it is still spreading.
✅ Containment up 2% — firefighters have secured more of the perimeter, meaning less of the fire edge can spread freely.
The BIG GRASS Fire in Malheur County, Oregon, grew by 36,694 acres in the past reporting period, bringing the total burned area to 541,079 acres since it was discovered on July 23. Containment increased by 2 percentage points to 41%, indicating that crews are holding and extending defensive lines across portions of the perimeter while the fire continues to expand in other areas.
The naturally caused fire is burning through short grass fuel, which characterizes its rapid spread and the ongoing challenge to establish a complete perimeter. A Complex Incident Management Team has assigned 1,214 personnel to the suppression effort. The modest 2-point gain in containment against a backdrop of significant acreage growth suggests crews are not yet gaining decisive ground; they are managing the advance rather than reversing it.
The fire remains in active growth phase with containment still well below 50 percent. At the current trajectory of personnel deployment and containment trend, the fire is not yet substantially under control, and further expansion remains a near-term risk. Residents in the area should follow all evacuation orders and guidance from local authorities and the managing incident team.
FireRisk.ai covers active wildfire incidents and home fire risk using official NIFC, National Weather Service, and NASA FIRMS data. Briefings are generated automatically from verified official feeds and reviewed for accuracy.
Update timeline
The BIG GRASS Fire in Malheur County, Oregon, grew by 36,694 acres in the past reporting period, bringing the total burned area to 541,079 acres since it was discovered on July 23. Containment increased by 2 percentage points to 41%, indicating that crews are holding and extending defensive lines across portions of the perimeter while the fire continues to expand in other areas.
The BIG GRASS Fire in Malheur County, Oregon, held steady on August 9 after two weeks of active suppression, with no change in acreage or containment since the last report. The fire, discovered on July 23, now spans 504,385 acres and remains 39% contained — a threshold indicating crews are actively holding and extending defensive lines across most of the perimeter rather than losing ground.
The BIG GRASS Fire in Malheur County, Oregon, remains stationary at 442,316 acres with containment holding at 41 percent as of August 8, the sixteenth day since discovery on July 23. No growth or containment progress has been recorded since the last report, indicating that crews have stabilized the perimeter but have not yet begun significant expansion of the fire line.
The Big Grass Fire in Malheur County, Oregon, remained static on August 6, holding at 358,911 acres with containment unchanged at 39% since the previous report. Discovered on July 23 and fueled by short grass, the fire continues to occupy more than half of its perimeter with active suppression still underway across the majority of the fire's edge.
The Big Grass Fire in Malheur County, Oregon, remained static on August 6, holding at 358,911 acres with containment unchanged at 39% since the previous report. Discovered on July 23 and fueled by short grass, the fire continues to occupy more than half of its perimeter with active suppression still underway across the majority of the fire's edge.
The BIG GRASS Fire grew by 4,326 acres in the latest reporting period, expanding to 346,678 acres across Malheur County, Oregon, while crews made measurable progress containing the blaze. The fire was first discovered on July 23 and has now burned for nearly two weeks as a fast-moving incident across short-grass terrain that fuels rapid spread.
The BIG GRASS Fire in Malheur County, Oregon, remained static on August 4, holding at 342,352 acres with containment unchanged at 25 percent. Discovered on July 23, the fire has now burned for twelve days across short-grass terrain. No new growth occurred since the last report, but the low containment figure indicates crews are still in active suppression across most of the fire's perimeter, with significant uncontrolled perimeter remaining.
The BIG GRASS Fire, discovered July 23 in Malheur County, Oregon, has grown to 307,518 acres with containment holding at 19 percent as of August 2. The fire's size and perimeter remain unchanged since the last report, but crews continue active suppression across most of the fire's edge. The cause remains undetermined. Short grass averaging one foot in height fuels the fire across the landscape.
Firefighting aircraft over this fire
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BIG GRASS Fire — current status questions
Is the BIG GRASS Fire contained?
As of August 10, 2026, the BIG GRASS Fire is 41% contained in Malheur County, OR. Containment means that percentage of the fire's perimeter has been secured by crews — the fire can still burn inside those lines. Crews are extending and reinforcing containment lines across the perimeter. Follow your local fire authority for evacuation status.
How big is the BIG GRASS Fire?
As of August 10, 2026, the BIG GRASS Fire has burned 541,079 acres in Malheur County, OR. Wildfire acreage is the estimated total area inside the fire perimeter — it is updated as aerial and ground crews assess the boundary and changes frequently on active fires. One acre is roughly the size of a football field; 845.4 square miles.
When did the BIG GRASS Fire start?
The BIG GRASS Fire was first reported on July 23, 2026 (17 days ago) in Malheur County, OR. The reported cause is natural. The fire's discovery date is reported by the incident agency to the National Interagency Fire Center (NIFC).
What caused the BIG GRASS Fire?
According to NIFC reporting, the BIG GRASS Fire was caused by natural. Cause determinations are made by trained fire investigators and may be updated as the investigation proceeds.
How many firefighters are working on the BIG GRASS Fire?
As of August 10, 2026, 1,214 total personnel are assigned to the BIG GRASS Fire according to NIFC. This figure includes all positions on the incident — engine crews, hand crews, dozers, aircraft, logistics, and incident management team members. Large fires typically involve resources from multiple agencies and can draw crews from across the country when local resources are stretched.
How much has the BIG GRASS Fire cost so far?
The estimated cost to suppress the BIG GRASS Fire is $37.4 million as of August 10, 2026, according to NIFC. Wildfire suppression costs include personnel, equipment, aircraft, and logistical support. Large fires often cost millions of dollars per day at peak operations, and total costs continue to accumulate until the fire is fully contained and crews demobilize.
Who is managing the BIG GRASS Fire response?
The BIG GRASS Fire is being managed by Complex Incident Management Team. Wildfire incident management teams (IMTs) are classified by complexity (Type 1 being the most complex). They coordinate all suppression resources — crews, aircraft, equipment — and produce the official daily situation reports posted to InciWeb.
Wildfire questions — BIG GRASS Fire area
Answers apply to all active wildfires; specifics use BIG GRASS Fire data where available.
What does the containment percentage mean for the BIG GRASS Fire?
Containment percentage is the share of the fire's perimeter that crews have physically secured — typically by cutting a firebreak or reaching a natural barrier like a road or river. A fire at 40% contained means 40% of the edge has a line that crews are confident will hold; the remaining 60% is still open. The fire can continue burning inside those lines even at high containment. Full containment (100%) means the entire perimeter is secured, though the fire may still smolder inside for weeks during mop-up.
How is wildfire acreage measured?
Wildfire acreage is the estimated total area enclosed within the fire's perimeter, not just the actively burning area. Crews and aircraft sketch the perimeter using GPS tracks, aerial infrared flights (typically flown at night), and satellite imagery. Because mapping lags the actual fire edge by hours to days, reported acreage is always an estimate — especially on a fast-moving fire. One square mile equals 640 acres; compare the acreage figure to the map perimeter for a sense of scale.
Is the smoke from the BIG GRASS Fire dangerous to breathe?
Wildfire smoke contains fine particles (PM2.5), carbon monoxide, and other compounds that are harmful to breathe — especially for children, the elderly, pregnant women, and anyone with heart or lung conditions. When AQI (Air Quality Index) is in the "Unhealthy" range (151+), everyone should reduce outdoor activity. At "Very Unhealthy" (201+), stay indoors with windows closed, run an air purifier if you have one, and wear an N95 or KN95 mask if you must go outside. Check the air quality tab on this fire's page or airnow.gov for live AQI readings near you.
How far does smoke from a wildfire travel?
Wildfire smoke can travel hundreds to thousands of miles depending on wind patterns and fire size. Smoke from large western U.S. fires has been recorded as far east as the Atlantic coast. At ground level, heavy smoke concentrations are typically within 50–150 miles of the fire, but air quality impacts can extend much further at altitude. Smoke dispersal depends heavily on upper-level wind direction, humidity, and whether the fire is producing a large smoke column. Check the live smoke map for current plume extent.
What is the difference between an evacuation order and an evacuation warning?
An evacuation order means leave immediately — conditions pose an immediate threat to life. You should not wait to gather belongings. An evacuation warning means be ready to leave at a moment's notice; conditions are threatening but not yet at the leave-now stage. Some jurisdictions use a three-tier system adding an "evacuation advisory" as the lowest level (monitor conditions). Zone designations (A, B, C or color-coded) indicate which areas are affected. Always follow the instructions of your local sheriff or fire authority — these designations can change within minutes as fire conditions shift.
How do I find out if my address is in an evacuation zone for the BIG GRASS Fire?
The most reliable sources are your county sheriff's office, local Office of Emergency Services, or state emergency management agency — they issue and update zone boundaries. Many counties now have online zone-lookup tools where you can type your address, and Genasys Protect (protect.genasys.com) covers much of the West. FireRisk.ai sweeps official evacuation feeds every 5 minutes and paints active zones on this fire's map where coverage exists. The evacuation tab on this fire's status page links to official county sources. If you're in a high-risk area and can't confirm your status, treat any warning as an order and leave.
What should I take if I have to evacuate because of the BIG GRASS Fire?
Prepare a go-bag in advance with: medications (a week's supply), important documents (ID, insurance cards, passports) or a USB with digital copies, phone charger and backup battery, cash, three days of clothes, water and non-perishable food, a first aid kit, and pet supplies if applicable. If you have time before leaving: take photos of your home and valuables for insurance purposes, close all windows and doors, move outdoor furniture inside, turn off gas, and leave exterior lights on so the home is visible in smoke. Don't wait until the last moment — roads become dangerously congested when orders are issued.
How do I sign up for free wildfire alerts near the BIG GRASS Fire?
Use the alert signup on this page to receive free email notifications when fires are reported near an address you choose, when Red Flag Warnings are issued for your area, or when a fire you're tracking significantly changes. You can also sign up for your county's emergency alert system (typically Wireless Emergency Alerts plus a county-specific opt-in) and follow your local sheriff on social media. No single source covers everything — use at least two.
Where can I find official updates directly from the BIG GRASS Fire incident team?
The incident management team publishes daily situation reports and operational updates to InciWeb (inciweb.wildfire.gov) — the official federal wildfire incident information system. Look up the fire by name to find its dedicated incident page with press releases, closure maps, and contact information. Many incident teams also post to a dedicated Facebook page. Your county Office of Emergency Services is the primary source for evacuation and road closure information specific to your community.
How often is the data on this page updated?
The headline figures (acres, containment, personnel) are pulled live from the National Interagency Fire Center (NIFC) WFIGS feed each time this page loads. NIFC data is typically updated once or twice daily by incident agencies — usually in the morning after overnight aerial mapping. The written daily briefing is regenerated automatically every few hours. For the most time-sensitive information during an active incident, check InciWeb and your local county emergency management office, as official reports there often appear before NIFC data is refreshed.
Does homeowners insurance cover wildfire damage?
Standard homeowners insurance (HO-3 policies) typically covers damage from wildfire under the "fire" peril, including the dwelling, other structures, and personal property. However, many insurers have been dropping coverage or non-renewing policies in high-risk California ZIP codes and other wildfire-prone areas. If your insurer dropped you, California's FAIR Plan (and similar state programs in other states) provides basic fire coverage as a last resort. After a wildfire, document all damage with photos before any cleanup, file your claim promptly, and keep receipts for additional living expenses — those are typically covered too. Check the policy's wildfire-specific exclusions and your coverage limits carefully.
How long does it take to fully contain a wildfire?
It depends almost entirely on size, terrain, fuel type, and weather. A small grass fire in flat terrain can be contained in hours. A large fire in steep, rugged terrain with dense chaparral or timber can take weeks or months — the 2020 August Complex in California took over two months and 1 million acres. Dry, windy conditions can undo days of progress overnight. Containment typically accelerates once temperatures drop and humidity rises. After full containment, mop-up operations (extinguishing hot spots, monitoring the perimeter) continue for weeks to prevent re-ignition.
What causes wildfires to spread rapidly?
The "fire triangle" of fuel, heat, and oxygen governs spread, but three conditions drive explosive growth: low relative humidity (below 15% makes fuels extremely receptive), high winds (spread flames ahead of the fire and loft embers — called spotting — that start new ignitions far ahead of the main fire), and steep terrain (fire races uphill because the slope pre-heats fuel above it). A fourth factor is drought-stressed or dead vegetation, which ignites and burns far more intensely than healthy plants. When all four conditions align — a dry spell, strong offshore or downslope wind event, cured grass or chaparral, and a spark — fires can grow from dozens to tens of thousands of acres in a single afternoon.
BIG GRASS Fire — incident details
- Discovered
- July 23, 2026
- Cause
- Natural
- Primary fuel
- Short Grass (1 foot)
- Managing organization
- Complex Incident Management Team
- Personnel assigned
- 1,214
- Estimated cost to date
- $37.4M
- Protecting unit
- ORVAD
- Landowner
- Federal
- Incident ID (IRWIN)
- 2026-ORVAD-260201
Source: National Interagency Fire Center (NIFC) WFIGS feed.
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Related
Sources
All figures on this page are sourced directly from official U.S. government and agency feeds. No proprietary or estimated data is used without clear labeling.
- National Interagency Fire Center (NIFC) — WFIGS ↗
Live fire size, containment, personnel, cost, cause, and incident boundaries
- InciWeb — Incident Information System ↗
Official incident management team updates, press releases, and evacuation notices
- National Weather Service (NWS) ↗
Red Flag Warnings, evacuation-level weather alerts, and fire-weather forecasts
- NASA FIRMS — Fire Information for Resource Management ↗
Satellite-detected active fire hotspots (VIIRS/MODIS)
- AirNow / EPA ↗
Air Quality Index (AQI) and smoke concentration near the incident
- Open-Meteo ↗
Fire-weather forecast (temperature, relative humidity, wind gusts) for the incident area
Headline figures are pulled live from the National Interagency Fire Center (NIFC) WFIGS feed and National Weather Service feed; the written briefing is generated automatically and is for awareness only — reported values lag real-time ground conditions. This is not an emergency service or official incident communication. In a wildfire emergency, call 911 and follow your local authorities and evacuation orders. Briefing last generated Mon, 10 Aug 2026 03:03:08 GMT.