FireSat, a satellite constellation built for wildfire detection, launched its first operational satellites in July 2026 and began delivering twice-daily fire data worldwide.
FireSat, a satellite constellation built specifically to spot wildfires, reached orbit for the first time as an operational system in July 2026. SpaceX launched three satellites from Vandenberg Space Force Base in California aboard a SpaceX rocket. Within two hours, all three had established contact with ground teams, marking the system’s shift from demonstration to active service.
The constellation comes from Earth Fire Alliance, a nonprofit coalition built around a single goal: catching wildfires earlier than existing satellites can. Most space-based fire detection today relies on instruments designed for weather or general Earth observation. FireSat was engineered from the ground up for one job, drawing on interviews with more than 200 firefighters, incident commanders, and scientists worldwide.
That focus shows up in the hardware. FireSat’s sensors can detect a fire as small as five meters by five meters, roughly the size of two parking spaces. Six imaging channels across five spectral bands work together to separate real fires from false alarms, keeping the error rate under five percent.
A second midwave infrared channel addresses a specific technical problem. A single sensor can essentially overexpose when pointed at an extremely hot fire, much like a camera struggles with a bright light source. The extra channel is tuned to stay accurate even at the highest temperatures.
These three satellites currently revisit the world’s most fire-prone regions at least twice daily. Earth Fire Alliance plans to shrink that gap to about one hour by 2029 as more satellites join the constellation. A full build-out of more than 50 satellites, targeted for 2030, would bring worldwide revisit times down to 20 minutes or less.
Early results are already circulating. In September 2026, the team released its first active-fire images from the operational satellites, captured roughly three weeks after launch. Earlier tests with a single demonstration satellite had already caught a small roadside fire in Oregon that existing systems missed entirely.
That demonstration satellite, launched in March 2025, spent more than a year in orbit proving the sensor technology before the operational constellation followed. During that period, it also captured thermal activity unrelated to wildfires, including a volcanic eruption and gas flares at an oil field, showing the instrument could distinguish between different types of heat sources. Those early tests gave engineers confidence to move from a single prototype to a working constellation.
A wildfire burns through forested terrain at dusk, the kind of early-stage blaze FireSat is designed to catch before it spreads. Photo by Pixabay on Pexels.
Beyond raw detection, FireSat tracks how a fire grows and moves once it starts. Data on a fire’s perimeter, spread direction, and radiative power feeds directly into incident commanders’ decisions. That kind of detail can shape evacuation orders and help responders decide where to send limited crews and equipment.
Faster detection also offers a real cost benefit. Published research suggests that a one-hour revisit rate across the United States alone could help avoid more than a billion dollars in fire damage annually. Projections also point to roughly 3,500 homes protected and 21.9 million tons of carbon emissions prevented each year once the system reaches that pace.
The project has been funded by a mix of philanthropic and corporate backers, including the Bezos Earth Fund, Google.org, and the Gordon and Betty Moore Foundation. Fire agencies such as CAL FIRE and research partners, including the Environmental Defense Fund, joined an early adopter program to help shape how the data is delivered. That early input helped earn the project a TIME Best Invention of 2025.
Access to the data remains a central question as the system scales up. According to Earth Fire Alliance, the goal is to make FireSat data available to any fire agency, scientist, or community that needs it, not only wealthy nations with existing satellite programs. Whether that goal holds up as the constellation grows will shape how evenly its benefits reach fire-prone regions worldwide.
For now, three satellites mark the start of what Earth Fire Alliance hopes becomes a global, persistent eye on wildfire. As more FireSat satellites join orbit over the coming years, the gap between a fire’s first spark and the moment responders learn about it should keep shrinking.
