Canada is experiencing an escalation in the length, size, and impact of its wildfire seasons, as revealed by a comprehensive analysis spanning six decades of fire data conducted by the Canadian Forest Service under the federal government. The study highlights a shift where a reduced number of larger wildfires are causing more extensive damage, rather than an increase in the frequency of fires. This trend, initially identified by federal scientists years ago, continues to be reinforced.
A 2019 study by Natural Resources Canada indicated a steady rise in wildfire activity nationwide since the mid-20th century, attributed to elevated temperatures and prolonged fire seasons. The latest research, featured in the Canadian Journal of Forest Research, builds upon this analysis up to 2024 using enhanced satellite mapping techniques and data from nine additional fire seasons, including notably severe years like 2021, 2023, and 2024.
The findings point to a continual increase in the area affected by wildfires across almost all eco-zones in Canada, even in regions traditionally considered lower risk due to wetter conditions, such as the Pacific Northwest and Atlantic Canada, which now exhibit stable or rising fire trends. Furthermore, the study highlights the growing proportion of damage caused by the largest wildfires and a resurgence in human-caused fires since the early 2000s, attributed to the challenging conditions of hotter and drier climates.
Chelene Hanes, a research scientist at the Canadian Forest Service, emphasized that the escalation in human-caused fires, especially the larger ones, is a consequence of drier fuel conditions. As the lead author of both the 2019 and 2025 national studies on Canada’s changing wildfire patterns, Hanes noted that conventional firefighting strategies are increasingly limited in combating these intense blazes, prompting a shift towards containment and protection strategies.
The impact of these mega wildfires is becoming more evident at a national level, with recent wildfire seasons showcasing the tangible consequences of these evolving fire dynamics across the country. The altered wildfire landscape has also reverberated in Canada’s insurance sector, with rising wildfire risks reshaping loss assessments, premiums, and long-term housing considerations nationwide. Insurance industry data reflects a notable surge in wildfire-related losses over the past decade, leading to adjustments in coverage pricing and policies to manage heightened risks in vulnerable communities.