August 19, 2026
SUBMITTED BY TRANSITION SALT SPRING
Every summer, Salt Spring residents watch the weather more closely than most. One term that comes up regularly during periods of high fire danger is the “30-30-30 Rule.” It sounds technical, but the idea behind it is straightforward and worth knowing.
The 30-30-30 Rule is widely used by wildfire professionals as a simple way to recognize conditions that can cause fires to grow quickly. It refers to three things happening at the same time:
• Temperatures above 30°C
• Relative humidity below 30 per cent
• Winds exceeding 30 km/h
When all three line up on the same day, vegetation and soil dry out fast, ignitions become more likely, and any fire that does start can spread quickly and unpredictably. Embers travel farther, spot fires can jump ahead of the main fire front, and firefighters face a much harder job. These are the days to take seriously.
The good news is that you do not need to wait for a 30-30-30 forecast to be ready. Most of the preparation happens well before fire season, and much of it is simpler than people expect.
Focus on What’s Closest to Your Home
Research consistently shows that the area within 30 metres of a home plays the biggest role in whether that home survives a wildfire. When a high fire weather forecast is issued, the following actions make the most difference:
• Clean roofs and gutters. Leaves, needles and debris are easy targets for wind-driven embers. A quick clean-out can significantly reduce risk.
• Clear the first 1.5 metres around your home. This is the most important FireSmart zone. Remove bark mulch, dry vegetation, firewood and any other combustible materials from right next to your foundation and walls.
• Move firewood away from structures. During fire season, firewood should be stored at least 10 metres from any building. A burning woodpile next to a wall can ignite a home fast.
• Keep grass short. Dry grass carries fire quickly across a property. Aim to keep it at about 10 centimetres or less within your home ignition zone.
• Remove dead vegetation. Dead branches, dry shrubs and accumulated needles all add to the fuel load around your home. Removing them is one of the most effective things you can do.
• Reduce ladder fuels. Pruning lower branches and thinning dense shrubs beneath trees prevents fire from climbing from the ground into the tree canopy.
• Clear under decks and stairs. These spots collect debris and are particularly vulnerable to ember ignition. Keeping them clean takes minutes and matters a lot.
• Check your vents. Embers can enter homes through the attic, soffits and crawlspace vents. Make sure your screens are intact and in good condition.
Think of the 30-30-30 Rule not as something to fear, but as a useful reminder that weather and preparation both matter.
Wildfires cannot always be prevented, but a property that has been FireSmart prepared has a genuinely better chance of coming through one, and also protecting your friends and neighbours from the risks on your land.
A few hours of work could make all the difference. Book a free FireSmart Home Assessment through Salt Spring Island Fire Rescue and get a trained eye on your property before fire season peaks.
People are invited to visit the Transition Salt Spring Wildfire Ready Hub for resources on emergency preparedness, wildfire risk reduction and community resilience: transitionsaltspring.com/wildfire.
Photo by Matt Howard