Before my thru-hike I envisioned building a fire every night during my journey. It didn't quite work out that way however. I was usually too tired to gather wood and tend a fire. I built most of my fires in New England to ward off the biting insects.
If you plan on building fires, heres a suggestion from someone who lives near the trail. Please don't be building any new fire rings. Every year maintainers, trail runners, and locals like myself have to destroy illegal fire pits built on or next to the trail. They leave ugly scars and encourage overuse of areas.
Rememebr your leave-no-trace skills. That includes the remains of any fire that you might be inclined to build.