Grand fir is moderately resistant to frequent surface fire.
Grand fir does not survive crowning or severe fire. On many Pacific Northwest sites, however, grand fir only dominates sites where fire is excluded. Sites experiencing severe fire often escaped fire through 2 to 3 surface fire cycles that occurred in surrounding forest. A minority of stands experienced mixed-severity fire of nonuniform spread. Fire regimes for plant communities and ecosystems where grand fir is a common associate are summarized below.