Between 2022 and 2025, outer London boroughs recorded over 6,000 grass fires, which is more than three times the number seen in inner London, where fewer than 1,800 were noted.
The highest totals were in Havering (536 grass fires), Bexley (494), Bromley (462), Hillingdon (419) and Enfield (404).
With forecasts this year indicating warmer than average temperatures, LFB said there was a clear need for early, preventative action to reduce risk to communities, infrastructure and the natural environment.
It called on people to dispose of their garden waste sensibly – by keeping it in secure piles and getting rid of it regularly and not leaving it to dry out near homes, fences and pathways.
Sutcliff said: “Spring cleaning offers a dual benefit: it keeps gardens and public spaces tidy and welcoming, while also helping to make communities safer.
“Grass fires can spread fast across parks and open spaces towards nearby homes. By creating fire breaks, removing dry debris, and storing waste safely, you can help protect your home, your neighbourhood, and local wildlife.”
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