Focusing on the Fire:
* Ember's Kiss
* Wildfire Hearts
* Burning Desire
* The Smoke and the Flame
* Forest Fire Love
Focusing on the Setting:
* The Redwood's Embrace
* Whispers of the Pines
* Beneath the Aspen Grove
* The Guardian of the Wilderness
Focusing on the Character:
* Stronger Than Smoke
* The Woman Who Tamed the Wild
* Fire in Her Eyes
* The Forest Whisperer
More Romantic Titles:
* Sparks Fly in the Wilderness
* Where the Wild Things Bloom
* The Love that Grew in the Ash
* The Accidental Flame
A little more playful:
* Hotshot Heart
* Firefighter & the Forest Prince
* Smoke Signals for Love
Ultimately, the best title will depend on the specific tone and themes of your novel. I hope this list gives you a good starting point!