My husband hikes and climbs in the desert frequently, and he has commented on how amazingly fast new growth begins after a forest or wild fire. Yes, it takes many years fr a tree to grow to the size it was before, but new growth starts almost immediately.
Lots of things only sprout after a fire either directly because of the effect of the heat on the seeds (some evergreens) or because the chemistry of the soil has changed. Because of the vagaries of seed dispersal, some areas may rejuvenate quickly and others take longer. The severity of the fire damage can also have a large impact.
Your husband is a rock climber? Do you climb? We are a fanatical family of rock climbers.