The Receipt

Natural Resources Canada reports that international personnel accounted for 38 percent of total person-days dedicated to wildland firefighting in Canada in 2018, and 37 percent in 2021 [1]. The figures appear in the State of Canada’s Forests, the federal government’s annual public accounting of the country’s forest resources. NRCan says Canada requires support from international partners most years [1]. CIFFC’s own 2023 year-end assessment says the organization relied heavily on its international partners for support [2].

The percentages invite a straightforward reading: foreign crews perform roughly four in ten wildfire person-days nationally. But NRCan does not define the denominator. “Total person-days dedicated to wildland firefighting” is not explained in the report. No data dictionary, technical note, or public dataset specifies which categories of personnel or which types of work are included. The implied totals — approximately 52,000 and 48,000 person-days — are difficult to reconcile with publicly reported provincial staffing. British Columbia alone engaged nearly 4,000 personnel in its 2021 wildfire response [3]. The federal government now says Canada can mobilize up to 15,000 fire personnel over the course of a year [7].

The dependency on international assistance is real. NRCan says so. CIFFC says so. The 2023 season required more than 5,700 international personnel from 12 countries [2] [5]. But the statistic most often cited to describe the dependency’s scale cannot be independently interpreted from the public record. Readers cannot determine what was counted, reproduce the calculation, or compare the figure with national capacity.

The Statistic

In 2018, Canada received more than 840 international personnel through formal mutual aid arrangements, producing more than 19,800 person-days of work [1]. NRCan reported this as 38 percent of total person-days dedicated to wildland firefighting. In 2021, 367 international personnel supplied 17,778 person-days, reported as 37 percent [1].

International deployment has continued at scale. In 2017, CIFFC coordinated more than 600 international firefighters and overhead staff to British Columbia during that province’s then-record fire season [6]. In 2023, CIFFC coordinated 5,504 international personnel from 12 countries [2]. Public Safety Canada separately recorded 212 arriving through direct US-province compact agreements, for a seasonal total of 5,716 [5].

The arithmetic behind the percentage figures implies total denominators of approximately 52,000 person-days in 2018 and 48,000 in 2021. Both are approximate: the 2018 international figure is reported as “more than” 19,800, and the percentages are likely rounded. NRCan does not disclose what those denominators include. The report does not specify whether “total person-days” covers personnel working inside their home province or only those shared between jurisdictions. It does not state whether contractors, municipal departments, Parks Canada, the Canadian Armed Forces, Indigenous crews, or volunteers are counted [1].

What the Denominator Might Be

CIFFC describes its core function as coordinating mutual aid and resource sharing among member agencies [4]. Its mobilization statistics count the cumulative number of initial attack firefighters, sustained action firefighters, and overhead positions mobilized through its system [4]. CIFFC’s annual Canada Reports focus on domestic and international resource sharing [2] [3]. This institutional context is consistent with a denominator that captures the interagency sharing layer rather than the full national workforce. But consistent is not confirmed. NRCan has not stated that the person-day figures are drawn from CIFFC mobilization data, and other constructions remain possible.

What the provincial record does establish is a scale problem. British Columbia’s 2021 wildfire response engaged nearly 4,000 personnel at peak [3]. Public Safety Canada reported 10,709 domestic firefighters participating in the 2023 response, though with caveats about potential duplication and omissions [5]. The federal government now says Canada can mobilize up to 15,000 professional and volunteer fire personnel over the course of a year, though without publishing the underlying inventory or methodology [7]. Set against those figures, a national denominator of approximately 50,000 person-days is difficult to read as a measure of all wildfire work conducted across the country.

The denominator might capture sustained-action deployments but not initial attack. It might cover only personnel recorded through participating agencies. It might count person-days charged through mutual aid agreements. The public record does not resolve the question. What it establishes is that the methodology is not available to the reader who encounters the percentage.

What the Public Record Does Not Contain

No reproducible national person-day accounting was located in the public record. No published source aggregates all provincial, territorial, federal, contract, Indigenous, volunteer, and military person-days engaged in wildfire across Canada in a given season into a single auditable measure.

The federal government’s statement that Canada can mobilize up to 15,000 fire personnel provides a capacity estimate [7]. But it does not include the provider-level breakdown, the person-day methodology, or the connection to the NRCan percentages that would allow the two figures to be reconciled. Public Safety Canada has acknowledged that compiling firefighter numbers for the 2023 season was difficult, with totals drawn from multiple reporting systems and potentially containing duplicates or omissions [5]. The Canadian Association of Fire Chiefs’ 2024 Census documents structural fire services nationally but does not aggregate wildland firefighting capacity [8].

No finding identifying this absence as a gap was located in the Commissioner of the Environment’s June 2025 report on adaptation, the Standing Committee on Natural Resources proceedings from 2023 to 2025, or federal auditor general reports reviewed for this article. No published target states what total national wildland firefighting capacity should be, what share international personnel should supply, or what person-day level Canada aims to maintain domestically.

What Would Change This Assessment

Three conditions would defeat this finding.

  • If NRCan or CIFFC publishes the methodology behind the person-day denominator — specifying which personnel categories, agencies, and types of work are included — and the denominator demonstrably represents the complete national wildfire effort, the reproducibility finding fails and the 38 percent figure means what its plain language suggests.
  • If a federal institution publishes a national wildfire capacity accounting that connects the mobilizable workforce with the person-day statistics in a single, auditable framework, the measurement-gap finding fails.
  • If a published capacity target or international dependency threshold exists in federal or CIFFC planning documents that this review did not locate, the “no target” finding fails.