| Terrestrial ecozone | Forest type | Age (years) | Total | |||||||||||
| 1-20 | 21-40 | 41-60 | 61-80 | 81-100 | 101-120 | 121-140 | 141-160 | 161-180 | 181-200 | 201+ | Other1 | |||
| Taiga Plains | Non-treed | <0.01 | <0.01 | 0.00 | ±0.01 | <0.01 | - | - | - | - | - | - | ±0.08 | ±0.08 |
| Treed Mixedwood | ±0.75 | ±4.09 | ±6.38 | ±9.66 | ±9.45 | ±27.83 | ±11.37 | ±5.38 | ±3.37 | ±4.16 | ±1.76 | - | ±34.71 | |
| Treed Broadleaf | ±1.74 | ±4.01 | ±9.83 | ±29.14 | ±29.12 | ±18.06 | ±21.71 | ±13.73 | ±4.87 | ±0.15 | - | - | ±53.13 | |
| Treed Coniferous | ±1.33 | ±4.68 | ±10.91 | ±17.38 | ±17.51 | ±90.09 | ±17.85 | ±17.47 | ±11.29 | ±3.61 | ±3.58 | - | ±98.21 | |
| Subtotal | ±2.32 | ±7.39 | ±16.01 | ±35.28 | ±35.27 | ±96.01 | ±30.32 | ±22.86 | ±12.75 | ±5.51 | ±3.99 | ±0.08 | ±116.93 | |
| Taiga Shield | Non-treed | - | - | ±4.35 | ±0.34 | ±0.01 | - | - | - | - | - | - | ±1.09 | ±4.50 |
| Treed Broadleaf | ±0.90 | ±1.60 | ±2.86 | ±1.10 | ±1.17 | ±6.18 | ±0.14 | - | - | - | - | - | ±7.24 | |
| Treed Mixedwood | ±0.87 | ±1.61 | ±2.02 | ±3.57 | ±3.33 | ±2.02 | ±7.38 | ±0.97 | - | - | - | - | ±9.52 | |
| Treed Coniferous | ±2.81 | ±9.14 | ±17.78 | ±15.13 | ±31.10 | ±34.74 | ±43.09 | ±51.58 | ±1.06 | ±2.81 | ±14.45 | - | ±86.86 | |
| Subtotal | ±3.07 | ±9.42 | ±18.64 | ±15.58 | ±31.30 | ±35.35 | ±43.72 | ±51.59 | ±1.06 | ±2.81 | ±14.45 | ±1.09 | ±87.80 | |
| Boreal Shield | Non-treed | ±0.65 | ±1.09 | ±1.33 | ±9.72 | ±3.27 | ±3.89 | ±0.56 | ±0.15 | ±0.30 | ±0.20 | ±0.12 | ±3.97 | ±11.83 |
| Treed Broadleaf | ±6.86 | ±14.25 | ±32.03 | ±44.45 | ±44.59 | ±20.75 | ±6.57 | ±2.63 | ±3.16 | ±1.23 | - | - | ±75.71 | |
| Treed Mixedwood | ±9.08 | ±18.39 | ±29.19 | ±38.73 | ±41.01 | ±17.82 | ±9.33 | ±6.59 | ±3.84 | ±1.83 | ±1.65 | - | ±70.17 | |
| Treed Coniferous | ±10.89 | ±33.01 | ±48.23 | ±59.22 | ±62.92 | ±68.77 | ±56.13 | ±21.42 | ±10.04 | ±1.93 | ±1.83 | - | ±139.45 | |
| Subtotal | ±15.77 | ±40.40 | ±64.86 | ±84.12 | ±87.40 | ±74.11 | ±57.28 | ±22.56 | ±11.20 | ±2.94 | ±2.46 | ±3.97 | ±173.90 | |
| Atlantic Maritime | Non-treed | ±0.03 | ±0.01 | ±0.02 | ±0.02 | <0.01 | - | - | - | - | - | - | ±0.70 | ±0.70 |
| Treed Broadleaf | ±4.32 | ±8.00 | ±15.21 | ±20.13 | ±17.88 | ±11.11 | ±0.74 | ±1.83 | ±0.37 | - | ±0.08 | - | ±34.15 | |
| Treed Mixedwood | ±3.98 | ±8.70 | ±14.83 | ±18.76 | ±13.83 | ±8.52 | ±2.25 | ±0.58 | - | ±0.22 | - | - | ±30.54 | |
| Treed Coniferous | ±5.11 | ±12.60 | ±14.19 | ±18.85 | ±16.95 | ±9.82 | ±3.94 | ±1.05 | ±0.09 | - | - | - | ±33.79 | |
| Subtotal | ±7.79 | ±17.28 | ±25.55 | ±33.35 | ±28.25 | ±17.10 | ±4.60 | ±2.19 | ±0.38 | ±0.22 | ±0.08 | ±0.70 | ±56.93 | |
| Mixedwood Plains | Non-treed | - | - | - | - | - | - | - | - | - | - | - | ±0.41 | ±0.41 |
| Treed Coniferous | ±1.12 | ±1.92 | ±4.44 | ±2.78 | ±1.21 | ±0.44 | ±0.23 | ±0.88 | - | - | - | - | ±5.91 | |
| Treed Mixedwood | ±0.77 | ±2.54 | ±6.38 | ±6.75 | ±4.42 | ±2.51 | ±0.82 | ±0.41 | - | - | - | - | ±10.95 | |
| Treed Broadleaf | ±0.78 | ±2.51 | ±12.34 | ±11.76 | ±11.17 | ±5.20 | ±2.53 | ±0.86 | ±0.41 | - | - | - | ±21.37 | |
| Subtotal | ±1.56 | ±4.05 | ±14.59 | ±13.84 | ±12.07 | ±5.79 | ±2.67 | ±1.30 | ±0.41 | - | - | ±0.41 | ±24.73 | |
| Boreal Plains | Non-treed | ±0.21 | ±0.36 | ±0.15 | ±0.07 | ±0.38 | ±2.95 | ±0.33 | ±0.09 | - | - | - | ±1.59 | ±3.42 |
| Treed Mixedwood | ±4.61 | ±8.64 | ±14.96 | ±23.13 | ±23.61 | ±20.30 | ±16.07 | ±7.09 | ±3.03 | ±0.63 | ±0.36 | - | ±46.29 | |
| Treed Broadleaf | ±9.29 | ±14.68 | ±32.49 | ±55.75 | ±42.04 | ±29.61 | ±19.38 | ±7.16 | ±1.31 | ±0.14 | - | - | ±86.82 | |
| Treed Coniferous | ±7.23 | ±15.03 | ±21.43 | ±50.05 | ±38.15 | ±40.16 | ±31.01 | ±22.07 | ±16.96 | ±7.64 | ±8.29 | - | ±90.41 | |
| Subtotal | ±12.64 | ±22.72 | ±41.70 | ±78.41 | ±61.48 | ±53.94 | ±39.94 | ±24.26 | ±17.28 | ±7.67 | ±8.30 | ±1.59 | ±133.66 | |
| Prairies | Treed Mixedwood | ±0.09 | ±0.19 | ±0.44 | ±0.45 | ±0.27 | ±1.09 | ±0.11 | - | - | - | - | - | ±1.31 |
| Non-treed | ±0.04 | ±0.05 | <0.01 | - | - | - | - | - | - | - | - | ±1.15 | ±1.15 | |
| Treed Coniferous | ±0.06 | ±0.44 | ±1.45 | ±0.11 | ±0.79 | ±2.17 | ±0.22 | ±0.52 | - | - | - | - | ±2.83 | |
| Treed Broadleaf | ±3.00 | ±7.79 | ±5.02 | ±1.87 | ±2.06 | ±0.40 | - | ±0.02 | - | - | - | - | ±10.14 | |
| Subtotal | ±3.00 | ±7.80 | ±5.25 | ±1.93 | ±2.22 | ±2.46 | ±0.24 | ±0.52 | - | - | - | ±1.15 | ±10.67 | |
| Taiga Cordillera | Non-treed | - | - | ±0.15 | ±1.39 | ±2.39 | - | - | - | - | - | - | 0.00 | ±2.77 |
| Treed Broadleaf | ±0.18 | ±0.49 | ±0.43 | ±0.06 | ±2.47 | ±0.02 | - | - | - | - | - | - | ±2.56 | |
| Treed Mixedwood | ±0.17 | ±0.70 | ±1.04 | ±0.86 | ±0.68 | ±0.71 | ±2.67 | ±0.29 | ±2.17 | - | - | - | ±3.90 | |
| Treed Coniferous | ±0.03 | ±1.27 | ±4.79 | ±6.07 | ±6.12 | ±5.62 | ±49.59 | ±8.83 | ±4.08 | ±0.56 | - | - | ±51.81 | |
| Subtotal | ±0.25 | ±1.54 | ±4.92 | ±6.29 | ±7.05 | ±5.66 | ±49.66 | ±8.83 | ±4.62 | ±0.56 | - | 0.00 | ±52.10 | |
| Boreal Cordillera | Non-treed | ±0.01 | ±0.94 | ±2.41 | ±3.38 | ±5.52 | ±6.80 | ±2.94 | ±0.24 | - | - | - | ±0.11 | ±10.17 |
| Treed Broadleaf | ±0.56 | ±1.16 | ±4.33 | ±8.27 | ±6.32 | ±12.24 | ±15.95 | ±7.93 | ±0.59 | ±1.83 | ±0.69 | - | ±24.50 | |
| Treed Mixedwood | ±0.42 | ±1.13 | ±8.40 | ±16.91 | ±10.15 | ±10.08 | ±10.50 | ±12.32 | ±6.47 | ±6.06 | ±6.70 | - | ±30.79 | |
| Treed Coniferous | ±0.94 | ±3.27 | ±14.89 | ±23.04 | ±22.74 | ±47.44 | ±40.56 | ±32.31 | ±31.34 | ±11.01 | ±38.79 | - | ±93.96 | |
| Subtotal | ±1.17 | ±3.77 | ±17.80 | ±29.94 | ±26.27 | ±50.48 | ±44.93 | ±35.48 | ±32.00 | ±12.70 | ±39.37 | ±0.11 | ±102.37 | |
| Pacific Maritime | Non-treed | - | - | - | - | - | - | - | - | - | - | - | ±0.44 | ±0.44 |
| Treed Mixedwood | ±0.21 | ±2.76 | ±5.56 | ±12.96 | ±7.49 | ±6.15 | ±2.48 | ±3.11 | ±0.76 | ±0.01 | ±5.66 | - | ±18.68 | |
| Treed Broadleaf | ±0.24 | ±2.73 | ±9.38 | ±8.21 | ±12.02 | ±13.32 | ±4.41 | ±3.29 | ±0.08 | ±4.29 | ±5.01 | - | ±23.63 | |
| Treed Coniferous | ±3.62 | ±19.18 | ±51.26 | ±57.27 | ±40.30 | ±35.23 | ±34.65 | ±26.19 | ±20.09 | ±14.97 | ±191.47 | - | ±219.83 | |
| Subtotal | ±3.64 | ±19.57 | ±52.40 | ±59.29 | ±42.71 | ±38.16 | ±35.01 | ±26.58 | ±20.10 | ±15.58 | ±191.62 | ±0.44 | ±221.89 | |
| Montane Cordillera | Non-treed | ±0.03 | ±0.02 | - | <0.01 | ±0.06 | ±0.01 | ±0.01 | <0.01 | - | <0.01 | - | ±1.77 | ±1.77 |
| Treed Broadleaf | ±0.03 | ±4.07 | ±4.56 | ±8.83 | ±17.32 | ±11.78 | ±9.34 | ±7.01 | ±1.00 | ±4.58 | ±2.55 | - | ±26.81 | |
| Treed Mixedwood | ±3.14 | ±4.12 | ±14.25 | ±9.42 | ±22.64 | ±28.77 | ±13.64 | ±14.04 | ±3.13 | ±3.53 | ±2.75 | - | ±45.52 | |
| Treed Coniferous | ±2.60 | ±14.83 | ±25.31 | ±27.84 | ±56.56 | ±59.21 | ±61.72 | ±62.16 | ±45.40 | ±34.40 | ±128.30 | - | ±189.02 | |
| Subtotal | ±4.07 | ±15.92 | ±29.41 | ±30.69 | ±63.33 | ±66.88 | ±63.90 | ±64.11 | ±45.52 | ±34.88 | ±128.36 | ±1.77 | ±196.27 | |
| Hudson Plains | Non-treed | - | - | <0.01 | ±0.01 | ±0.01 | <0.01 | - | - | - | - | - | ±0.75 | ±0.75 |
| Treed Broadleaf | ±0.25 | ±0.11 | ±0.25 | ±1.26 | ±0.97 | ±0.37 | ±0.03 | - | - | - | - | - | ±1.67 | |
| Treed Mixedwood | ±0.07 | ±0.68 | ±1.21 | ±1.44 | ±1.49 | ±3.48 | ±0.71 | ±0.15 | - | - | - | - | ±4.34 | |
| Treed Coniferous | ±0.47 | ±5.28 | ±6.52 | ±8.13 | ±9.61 | ±10.52 | ±15.55 | ±7.04 | ±0.76 | ±0.01 | - | - | ±25.13 | |
| Subtotal | ±0.54 | ±5.32 | ±6.64 | ±8.35 | ±9.77 | ±11.09 | ±15.56 | ±7.04 | ±0.76 | ±0.01 | - | ±0.75 | ±25.57 | |
| Canada | Non-treed | ±0.68 | ±1.48 | ±5.15 | ±10.39 | ±6.86 | ±8.37 | ±3.01 | ±0.30 | ±0.30 | ±0.20 | ±0.12 | ±5.03 | ±17.00 |
| Treed Broadleaf | ±12.88 | ±24.37 | ±52.18 | ±81.83 | ±74.46 | ±47.84 | ±35.47 | ±19.33 | ±6.09 | ±6.66 | ±5.66 | - | ±140.56 | |
| Treed Mixedwood | ±11.47 | ±23.27 | ±41.10 | ±55.54 | ±56.79 | ±50.68 | ±29.07 | ±21.97 | ±9.60 | ±8.39 | ±9.51 | - | ±113.22 | |
| Treed Coniferous | ±15.13 | ±47.03 | ±83.66 | ±107.68 | ±111.56 | ±151.35 | ±125.14 | ±98.16 | ±63.09 | ±40.15 | ±234.35 | - | ±377.09 | |
| Total | ±22.95 | ±57.87 | ±106.94 | ±146.57 | ±145.82 | ±166.83 | ±133.31 | ±102.43 | ±64.11 | ±41.55 | ±234.61 | ±5.03 | ±418.40 | |
| Source: Canada's National Forest Inventory, combined remeasured (2007-2017) and projected (2006-2017 with NFI projection system) data (Version 3.1, October 2025) (http://nfi.nfis.org) | ||||||||||||||
| Note: The Arctic ecozones (Arctic Cordillera, Northern Arctic, Southern Arctic), and the Taiga Plains and Hudson Plains ecozones located in Nunavut, are not inventoried. These non-inventoried areas total 262,189.89 thousand ha. | ||||||||||||||
|
1 Missing or unknown age class. |
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